Home

1vv0300714_GE863

1. o TO 5 o e Os o N o Os ri o gum E s T v a a ceo ow o ee do aan deMBER D a a ae I ae a a a ae a a ee ee ee OLTTTUASILZOE T T 9Lc0 Ha a Oh G 5 ZGODONIMVNG sizeHsso nicas aoarowa 9 9 BEY NA ndsc Tezanevesox dris V mm aeve roon TS o E urn pn am ag N gt x CONTI IV p voi 2 ad VHUAMVO TVNA SNADTI AVN TA Ha 6 oy D NOLLaTNOSHCI vanruasn pron HIYA ono exo aya 1n E E o E o O H Ba eo O HF e x Els LL a SE 1k sib BBE D A EU E Za wp Er t PP PP um soa 07D RE a e en sium v mdi ES O spar 1 Bj ad a dm Plan cue 4 o r sorrara Q sur B sai ele IS daa 2 uh toe a o0 Es ew aika aaa Luc e M pU EU e 1 E 5 i SUOIOSNNOO JOVAMALNI I GST l I l u YM e m i i j Se ai i o a a E i A x off a E l 0 oe m ot l Gn GG yy EGG l OTe OTe D i ag ale i nd 81 ogozicoav manay amp _ o Bro ot i I OTa o i l Oe Oz l p Te OT A dE a T 3 O Ta Ka 1 F gs fas o
2. 39 i 3 mo R516 D i 47K a i 197 DECOUPLING CAPACITORS BND a USD2 w nae Sarasa ARAN 2 4 153481210 SE a 15K vt i BES D v EE i ha 2 4 ae 5 z SD C527 R6145 mo LE 0 NI 47K T 1 1 Er un to i 3 FROM 1 08 GE863 MIC m wo 33v o Ww ee i 2120 GND GND a Ubde m A T53VB1210 o r D o 15K joy al ass E a EE IT 4 BIR ANS RANA a E GND Da LE LO mu wa tjm This circuit has a gain of 10 times 20 dB and is therefore suited for the Mic MT input if you have a microphone with a sensitivity close to the suggested one 45 dBV msPa If your microphone has a different sensitivity or if the buffer is connected to the Mic HF inputs then a gain adjustment shall be done by changing resistors R604 and R606 if the required value is not a standard one you can change R605 e R607 and as a consequence the capacitors C636 and C637 to maintain the bandwidth 150 4000Hz at 3dB KE B Reproduction forbidden without Telit Communications S p A written authorization All Right page 45 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 The buffer gain is given by the formula R604 R606 Gain R605 R607 The C636 and C637 capacitors are placed in order to cut off the gain at higher frequencies than the transmitted GSM band the cutoff freq
3. M S 63 10 5 1 lb eappUiRM o e Han Laang 63 10 5 2 Pulse Characteristics em rtr Re cde eee er bebe p a epe che eo Ho reve Fei GN d ERR Naa 63 dl DACnrid ADC S ction M 64 11 1 DAC COME dia 64 11 1 1 DESC do UR RE a as oes 64 11 1 2 Enabling DAC ea de NING NLANG o UY 65 11 1 3 Low Pass Filter Example EE EURO ERR RE chad 65 11 2 ADC CONE 66 11 2 1 snnm EUER 66 11 22 Using ADC Converters ise ete t rra eiie tiU det e ere de e i hand 66 AEG 0o 67 12 1 Transchip Camera E R aoisi 67 12 1 1 Camera Interface Connectors 1 aea este ei i eei Te EF iie Heec Hari ER EALAGH ANGHANG 68 12 1 2 EVB for Transchip camera support ulan Amana nna 70 12 1 3 Block Diagram for supported cameras eese ener etre on aran enne nan nee innen 71 12 1 4 Schematic Diagrams for supported camera essent ennenrenetnnn nena rn anne enn innen 72 12 1 5 Example usage script for Ccamiera 2 nici aiii 73 13 Mounting the GE863 GPS on the Application BOard sscccsssccessscssssscssnsscssssccsssccessssccesceesssceees 74 Bl GAL NGAGE 74 13 2 Module Finishing Dimensions ecce ee ee eere eerte eene eese 0NAN 0 SAK GG S0 sete G0 s ease seen asse ense eese cccnocoso 74 13 2 1 Recommended foot print for the application seseeeee
4. 3 2 Turning OFF the GE863 GPS The turning off of the device can be done in three ways e by software command see GE863 GPS Software User Guide e by hardware shutdown e by Hardware Unconditional Shutdown When the device is shut down by software command or by hardware shutdown it issues to the network a detach request that informs the network that the device will not be reachable any more 3 2 1 Hardware shutdown To turn OFF the GE863 GPS the pad ON must be tied low for at least 2 seconds and then released The same circuitry and timing for the power on shall be used The device shuts down after the release of the ON pad TIP To check if the device has powered off the hardware line PWRCTL should be monitored When PWRCTL goes low the device has powered off 3 2 2 Hardware Unconditional Shutdown To unconditionally Shutdown the GE863 GPS the pad RESET must be tied low for at least 200 milliseconds and then released The maximum current that can be drained from the ON pad is 0 15 mA A simple circuit to do it is RESET NAA LI V V E Unconditional Shutdown NG BU impulse TAN A t V yoo 77 GND page 14 of 90 A Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 NOTE don t use any pull up resistor on the RESET line nor any totem pole digital output Using pull up resistor may bring to latch up problems on the GE863 GPS power regulator and improper
5. INTERNAL EAR AMPLIFIER 12dB UBO1 13 70 LN4662M 1 1 1 1 N 1 i 43 74 Ox mur nA SS olg TO SPEAKER pl 5 ho aL p gti EEEE Je m 5 i EAR CT KOS SHUTDDHN zr xD 1 a 2 ap 3 us FROM GE863 GPS EAR CT voe BYPASS E 55 8 CB21 CB22 7 eno mf 1 25 2 JE4R MI 40 pF soonr vv va i CB02 tev tev aoner 0503 0603 A C801 T po qe T PL803 1 6 3v 1215061 03F 1 0603 i ABO7 ABOG Le j 15 15 Wa Fa Ay 2 el MUTE CDNTROLLED l E s 3 __ LWAYE ON osoa oso i Wf e i END AJA 1 i Some amplifier require a low impedance load at high frequency in order to avoid auto oscillation this can be made with a capacitor 100nF in series with a resistor 150 When designing your application remember to provide an adequate bypass capacitor to the amplifier and place it close to the power input pin of the IC keeping the traces as short as possible 8 5 Hands Free Earphone Low Power Design The same design considerations made for the handset are valid for the hands free earphone Li 5 P t li ae q 4 a E Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 54 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06
6. ds zu 3 lt 1 u te o Za n pe m o 4 a y s 9 z a a Sze 22 z 8 3 sg 2 3 43 Ng 2 3 su 40 25 5 653 2 9 y ya 2 EJ E gt 3286 pi E q E 3q5 3 5 j s lt 5 lt p A 8 gt E e 3 8 e TESS 5 D 9 2 9 E 323 7 bi 3 x5 8 S85 23 G ot o NG y 9 3 OF Es o 3 82 2 amp o a Y veas 2 a0 xr Eeund a o a a o 2 T e LR 293855 92520799 FO OO 0500 o oouuouz200 NG o o 0 0 0000000000 OS e e o o o o 0 0 9 09 0 9 9 Oo Co292R6R82ooofxXxN EHE o 553 C58 578355241 6 w Y w gt Li 8 o cc 2 2 oF ww 4 2 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 87 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 15 Conformity Assessment Issues The GE863 GPS module is assessed to be conform to the R amp TTE Directive as stand alone products so If the module is installed in conformance with Dai Telecom installation instructions require no further evaluation under Article 3 2 of the R amp TTE Directive and do not require further involvement of a R amp TTE Directive Notified Body for the final product In all other cases or if the manufacturer of the final product is in doubt then the equipment integrating the radio module must be assessed against Article 3 2 of the R amp TTE Directive In all cases assessment of the final product must be made against the Essential req
7. GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 12 1 2 EVB for Transchip camera support In order to interface the Telit GE863 GPS with a CMOS camera Telit has developed an evaluation board The EVK allows the connector of all Telit modules through 2 connectors of 40 pins each The I2CBUS DUAL CAMERA board is plugged in the 2 connectors of 30 pins each on the module board CAMERA GUEY MODULE BOARD MAIN BOARD poe e gr C 3 5 A ES 3 1 E s ds Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 70 of 90 Pd e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 12 1 3 Block Diagram for supported cameras The numbers on the left side of the Camera s connectors refers to Module Connector s pin number DVDD is VAUX1 power supply from GE863 GPS CAMERA TRANSCHIP PD S 1 GND 2 AVDD 3 PD 4 CAM CLK 5 GND 6 7 8 9 10 11 42 13 14 15 16 17 18 DVDD 19 IICSDA CAM 20 DVDD AVDD GND 21 PD 0 22 GND 23 24 GNG DVDD MON1 CAM CAM CLK 5 y li d s f E Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 71 of 90
8. 20 09 06 NOTE In the unbalanced application the capacitor C3 shall be 200nF otherwise the frequency response will be cut at low band frequencies down to 300Hz This capacitor can be placed close to the MIC pad MIC HF or MIC MT depending on the audio path chosen or if possible it should be placed close to the shielded cable connector If the ground return path is well designed then it is possible to eliminate the C3 capacitor provided the buffer is close to the mic input NOTE The cable to the microphone should be shielded NOTE The microphone changes with the value of R2 Usually the microphone sensitivity is characterized with 2kQ biasing resistance so try to keep the value of R2 around 2kQ For mic characteristics refer to the manufacturer page 44 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 7 5 Microphone Buffering As seen previously a microphone shall be connected to the input pins of the GE863 GPS through a buffer amplifier that boosts the signal level to the required value Again the buffered microphone circuitry can be balanced or unbalanced where possible it is always preferable a balanced solution The buffering circuit shall be placed close to the microphone or close to the microphone wire connector 7 5 1 Buffered Balanced Mic A sample circuit can be BALANCED MICROPHONE BUFFER 20dB
9. 5 5 GPS Antenna PCB Line Guidelines NANG kr trha p puo dee 28 56 GPS Antenna Installation Guidelines 0cscscesseossnssovssssossusosseseoseonsseeesvsstecsnsseasecvessvevstnsseieseesosessusienn 28 6b SERA POP c rr 29 6 1 MODEM SERIAL PORT ABA DAAN 29 6 2 MODEM SERIAL PORT 2 GPS CONTROL eerte eee ee sans sano sano snassnasoe ano0 ano tte stes t teste sena soo 31 6 3 GPS SERIAL PORT A SIRF BINARY eee eee ee sooo seta setas tns etna s eaae toss tasses ette sete nose noscconoconos 31 6 4 GPS SERIAL PORT B NMEA eere ee reet rostros to soto soto netos e sano eO epo e eee eoo ea anenenesae Po sas esa setas toa epa 32 Aa eos Reproduction forbidden without Telit Communications S p A written authorization All Right page 3 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 6 5 RS232 Level Translation cscsccsssrscssccssscssecscesccssesscsscssssesessccssseneesossssencesecescessesscsscsssseneesessssenees 32 6 6 5V UART Level Translation csccccsscsssccsccssesseescsscsssssssscssssenesssessensesessssesessscescsssseneesesesseeees 34 MES nor nne ura m ABAKA AA 36 7 1 Microphone Paths Characteristic and Requirements eee ee eee eee eese ee stent n senses senatu stnat 38 7 2 General Design IL 41 7 3 Other Considerations EE 41 7 4 Mi
10. 8 6 Car Kit Speakerphone Design For the car kit speaker phone function the power output requirement is usually at least 4W therefore an amplifier is needed to boost the GE863 GPS output The design of the amplifier shall comply with the following guidelines The input to the amplifier MUST be taken from the Ear HF audio path of the GE863 GPS because of its echo canceller parameters suited to a car cabin use The amplifier shall have a gain of 30 40 times 29 32 dB to provide the desired output power of 5 10W with the signal from the GE863 GPS Ear HF audio output lines If the amplifier has a fixed gain then it can be adjusted to the desired value by reducing the input signal with a resistor divider network The amplifier shall have a mute control to be used while not in conversation This results in two benefits eliminating the background noise when not in conversation and saving power The power to the amplifier should be decoupled as much as possible from the GE863 GPS power supply by either keeping separate wires and placing bypass capacitors of adequate value close to the amplifier power input pads The biasing voltage of the amplifier shall be stabilized with a low ESR e g a tantalum capacitor of adequate value NOTE The GE863 GPS audio path connected to the car kit hands free amplifier MUST be Ear HF one otherwise the echo cancellation will not be done due to the difference in the echo canceller characteristics of th
11. reason as previous point Try to keep this trace as short as possible e The PCB traces connecting the Switching output to the inductor and the switching diode must be kept as short as possible by placing the inductor and the diode very close to the power switching IC only for switching power supply This is done in order to reduce the radiated field noise at the switching frequency 100 500 kHz usually e The use of a good common ground plane is suggested e The placement of the power supply on the board should be done in such a way to guarantee that the high current return paths in the ground plane are not overlapped to any noise sensitive circuitry as the microphone amplifier buffer or earphone amplifier e The power supply input cables should be kept separate from noise sensitive lines such as microphone earphone cables E o am n without Telit Communications S p A written authorization All Right reserved page 22 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 5 Antenna The antenna connection and board layout design are the most important part in the full product design and they strongly reflect on the product overall performances hence read carefully and follow the requirements and the guidelines for a proper design 5 1 GSM Antenna Requirements As suggested on the Product Description the antenna and antenna line on PCB for a Telit GE863 GPS device shall fulfil the following requ
12. 1 Combined GPS Antenna The use of combined GPS antennas is NOT recommended this solution could generate an extremely poor GPS reception and also the combination antennas requires additional diplexer and adds a loss in the RF route 5 4 2 Linear and Patch GPS Antenna Immediate 3 dB of loss relative to a circularly polarized CP antenna Spherical gain response instead of a hemispherical gain response will aggravate the multipath behavior amp create poor position accuracy lucky to achieve 50 m accuracy in some situations Poor LHCP relative to RHCP response Can have multiple gain nulls amp average gain is MUCH lower than a good patch 9 dB z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 25 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 Linear antennas Suppliers Filtronic new England FDK DA 5T26 new Japan Kyocera GPS and GPS BT Japan Murata Japan Taiyo Yuden new Japan Others like Tyco or custom designs Patch Antennas Suppliers e FDK e Kyocera e Murata e KDI Korea 5 4 3 LNA and Front End Design Considerations LNA gain should be between 12 dB and 26 dB assumes a patch antenna This assumes the patch used has gt 3 dBic of gain Linear antenna implementation should consider a minimum of 14 5 dB of LNA gain Excessive LNA gain 527 dB can introduce jamming spurs degrade 3IP and satura
13. 4 2 General Design Rules sissicccsssscessvsaccsconssnsecsvearcseoossensessiccsenocecceasssaccssnsevescessiccssnecersecvessedsennstsseured naseenss 17 424 Electrical Design Guidelines Naa GNG eSI oe exu ths NGIGING RUN KILIG AIN GA 17 4 2 1 1 5V input Source Power Supply Design Guidelines eessseeeeeeeeeeeeeeennee 17 4 2 1 2 12V Input Source Power Supply Design Guidelines eene 18 4 2 1 3 Battery Source Power Supply Design Guidelines eese nennen enne 19 4 2 1 4 Battery Charge control Circuitry Design Guidelines esee rene 20 4 22 Thermal Design Guidelines cosida ii i 21 4 23 Power Supply PCB layout Guidelines sess eene enne tree treten trennen net 22 OHNE 0020 s m Q 23 5 1 GSM Antenna Requirements cuneta erret eet ern GANA KAKA AA 23 52 GSM Antenna PCB line Guidelines ma rines ico 24 53 GSM Antenna Installation Guidelines c0 cssssesssosssssssssscseoresssorssssnsensonsestovesevonsuvourevsossoronneosese 25 5 4 GPS Antenna Requirements eem eae r aem serae B AGARAN Pena aeo ete a apres rH e dnos ene ein nido ario seo EE vende 25 SAT Combined GPS Antennas p ag nete cda 25 25412 Linear and Patch GPS Antena ede tte e tube pr ene bag ele dade rhe ete ctae e a 25 5 4 3 LNA and Front End Design Considerations essent nnen nennen reete nre 26
14. Average ramp up rate T to Tp 3 C second max Preheat Temperature Min Tsmin 150 C Temperature Max Tsmax 200 C Time min to max ts 60 180 seconds Tsmax to TL Ramp up Rate 3 C second max Time maintained above Temperature TL 217 C Time tL 60 150 seconds Peak Temperature Tp 245 0 5 C Time within 5 C of actual Peak 10 30 seconds Temperature tp Ramp down Rate 6 C second max Time 25 C to Peak Temperature 8 minutes max NOTE All temperatures refer to topside of the package measured on the package body surface NOTE GE863 GPS module can accept only one reflow process r M E 4 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 80 of 90 PA Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 13 2 7 Packing System According to SMT processes for pick amp place movement requirements Telit GE863 GPS modules are packaged on trays each tray contains 20 pieces Tray dimensions are Scritte in buszoriliero Prof 0 3 ma 10 2 170 0 3 critte in b rn1 0 3 mm 0 2 320 0 3 All quotes are in mm general tolerance 0 1 Note that trays can withstand a maximum temperature of 65 C Section A A As Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 81 of 90 A
15. Hardware User Guide 1vv0300714 Rev 4 20 09 06 DISCLAIMER The information contained in this document is proprietary information of Telit Communications S p A Telit Communications S p A makes every effort to ensure the quality of the information it makes available Notwithstanding the foregoing Telit Communications S p A does not make any warranty as to the information contained herein and does not accept any liability for any injury loss or damage of any kind incurred by use of or reliance upon the information Telit Communications S p A disclaims any and all responsibility for the application of the devices characterized in this document and notes that the application of the device must comply with the safety standards of the applicable country and where applicable with the relevant wiring rules Telit Communications S p A reserves the right to make modifications additions and deletions to this document at any time and without notice 2006 Telit Communications S p A MA Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 6 of 90 Z e Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 1 Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE863 GPS module In this document all the basic functions of a mobile phone will be taken into account for each one
16. and convert it into 11 bit word Min Max Units Input Voltage range 0 2 Volt AD conversion 11 bits Resolution lt 1 mV 11 2 2 Using ADC Converter An AT command is available to use the ADC function The command is ATHADC 1 2 The read value is expressed in mV Refer to SW user guide or to GE863 GPS AT commands specification for the full description of this function page 66 of 90 As Reproduction forbidden without Telit Communications S p A written authorization All Right reserved Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 12 Camera 12 1Transchip Camera The GE863 GPS provides a direct support for Transchip digital cameras with the following characteristics Type TRANSCHIP TC5747 Technology CMOS COLOR camera Max picture size VGA 480x640 pixels landscape Output format JPEG Sensitivity 4 Lux y Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 67 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 12 1 1 Camera Interface Connectors The pinout of the module and a 24 pins ZIF connector for the CMOS camera provide the interface connection between GE863 GPS and Transchip camera GE863 GPS signal TC5747MF24L Pin Signal 1 0 Notes Pin Signal 1 0 55 GPIO3 O 12C bus serial
17. as short as possible e f your application requires an unbalanced microphone then keep the lines on the PCB balanced and unbalance the path close to the microphone wire connector if possible e For the microphone biasing voltage use a dedicated voltage regulator and a capacitor multiply circuit e Make sure that the microphone traces in the PCB don t cross or run parallel to noisy traces especially the power line e f possible put all around to the microphone lines a ground trace connected to the ground plane by several vias This is done in order to simulate a shielded trace on the PCB e The biasing circuit and eventually the buffer can be designed in the same manner for the internal and external microphones 7 3 Other considerations If your application is a hands free car kit scenario but you need to put microphone and speaker inside the same box e try to have the maximum possible distance between them at least 7cm e becauses the microphone type is very important if you use an omni directional one and this is the typical applicaton please seal it on the rear side no back cavity in order not to collect unwanted signals e try to make divergent the main axes of the two devices z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 41 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 7 4 Microphone Biasing The
18. be used for handset function HF lines is suited for hands free function car kit These two blocks can be active only one at a time selectable by AXE hardware line or by AT command The audio characteristics are equivalent in transmit blocks but are different in the receive ones and this should be kept in mind when designing y Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 36 of 90 e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 audio2 skd EXTERNAL AMPLIFIER ite i Fully Differential Power Buffers Balanced Differential Line Out Drivers GM863 GPS Y GE863 GPS Audio Paths Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 37 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 7 1 Microphone Paths Characteristic and Requirements TIP being the microphone circuitry the more noise sensitive its design and layout must be done with particular care Both microphone paths are balanced and the OEM circuitry should be balanced designed to reduce the common mode noise typically generated on the ground plane However also an unbalanced circuitry can be used for particular OEM application needs TIP due to the difference in the echo canceller type the Mic MT audio path is suited for Handset applic
19. card is detected inserted when this line is short to ground If in the application the SIM holder doesn t foresee the switch for the presence absence of the SIM card the SIMIN line must be connected to ground 9 5 SCHEMATIC SO201 FMS006Z 2001 0 SIMIO SIMCLK SIMRST SIMVCC SIMIN SIMCLK Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 59 of 90 Z e Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 9 6 LAYOUT M forbidden without Telit Communications S p A written authorization All Right Ad page 60 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 10 General Purpose I O The general purpose I O pads can be configured to act in three different ways input output alternate function internally controlled Input pads can only be read and report the digital value high or low present on the pad at the read time output pads can only be written or queried and set the value of the pad output an alternate function pad is internally controlled by the GE863 GPS firmware and acts depending on the function implemented Not all GPIO pads support all these three modes GPIO5 supports all three modes and can be input output RFTX monitor output Alternate function GPIO6 supports all three modes and can be input output alarm output
20. dtr uart and RTS rts uart input lines are not pulled up internally so an external pull up resistor of 47KQ may be required A power source of the internal interface voltage corresponding to the 2 8VCMOS high level is available at the VAUX pad whose absolute maximum output current is 50mA If VAUX is also used to supply a Camera no additional devices could be connected Pull up resistors can be connected to the VAUX pad provided that the pulled up lines are GE863 GPS input lines connected to open collector outputs in order to avoid latch up problems on the GE863 GPS Care must be taken to avoid latch up on the GE863 GPS and the use of this output line to power electronic devices shall be considered with care especially for devices that generate spikes and noise such as level translators digital ICs or microcontroller failure in any of these condition can severely compromise the GE863 GPS functionality NOTE The input lines working at 2 8VCMOS can be pulled up with 47KQ resistors that can be connected directly to the VAUX line NO disturbing devices should be powered with the VAUX line otherwise the module functionality may be compromised page 35 of 90 Z Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 7 Audio Section Overview The Base Band Chip of the GE863 GPS Telit Module provides two different audio blocks both in transmit Uplink and in receive Downlink direction MT lines should
21. e Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 Modules orientation on tray IME1 1 SUB ISO 2345 nimiis Ref Not rounded corner C fiii lt of module s printed board indicates pin 1 corner The modules in the tray are oriented as shown in A and the tray is oriented toward left as shown in B Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 82 of 90 Pa e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 13 2 8 Moisture Sensibility The level of moisture sensibility of Telit GE863 GPS modules is 3 according with standard IPC JEDEC J STD 020 take care of all the relative requirements for using this kind of components Moreover the customer has to take care of the following conditions a The shelf life of GE863 inside of the dry bag shall be 12 month from the bag seal date when stored in a non condensing atmospheric environment of lt 40 C 90 RH b Environmental condition during the production lt 30 C 60 RH according to IPC JEDEC J STD 033A paragraph 5 c The maximum time between the opening of the sealed bag and the reflow process shall be 168 hours if the condition b IPC JEDEC J STD 033A paragraph 5 2 is respected d A baking is required if conditions b or c are not respected A baking is required if the humidity indi
22. electret microphones usually need a biasing voltage to work properly Refer to your microphone provider for the characteristics required Q NOTE The microphones have a hot wire were the positive biasing must be connected UsUAlly it is indicated by a symbol or a red point If the polarity of the bias is reversed then the microphone will not work properly For this reason be sure to respect the mic biasing polarity 7 4 1 Balanced Microphone Biasing The balanced microphone bias voltage should be obtained from a dedicated voltage regulator in order to eliminate the noise present on the power lines This regulator can be the same for all the audio paths The microphone should be supplied from a capacitor multiply circuit For example a circuit for the balanced microphone biasing can be 3 By 3V MIC MIC Biasing Regulator Capacity multiply circuit Lu 1 t i i LI D r C1 i our l t ah i i i Li i i Li Wi H i GND L D i i A 4 l i Electret microphone 1 aakala TRASERAS MICH C3 l i 1 r 3 H d i To MIC Buffer amplifier MEI a MIC CJ L e y Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 42 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 NOTE In the balanced application the resistors R2 and R3 must have the same value to k
23. functioning of the module The line RESET must be connected only in open collector configuration TIP The unconditional hardware shutdown should be always implemented on the boards and software should use it as an emergency exit procedure For example 1 Let s assume you need to drive the RESET pad with a totem pole output of a 3 5 V microcontroller UP OUT2 RESET cm PEZ a e nd i 1F5 TS4E OBI ous nM ME page 15 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 4 Power Supply The power supply circuitry and board layout are a very important part in the full product design and they strongly reflect on the product overall performances hence read carefully the requirements and the guidelines that will follow for a proper design 4 1 Power Supply Requirements The GE863 GPS power requirements are e Nominal Supply Voltage 3 8V e Max Supply Voltage 42V e Supply voltage range 34V 42V e Max Peak current consumption impulsive 1 9A e Max Average current consumption during GPRS transmission rms 500 mA e Max Average current consumption during VOICE CSD transmission rms 270 mA e Average current during Power Saving z4mA e Average current during idle Power Saving disabled 19 mA e GPS Max Peak current consumption 80 mA e GPS Max Average current consumption during Tracking 60 mA e GPS Average current during Power Saving
24. l MEDE OUT LT1528600 c O I I 3 1 i sh al C201 5 Y INPUT o z 1 t t 4 pees ANGGE tenuF AGHIMT 1 ond d C203 L202 Acta acne Aen Rana per rur tn 1 a7 i Enn brad 1 d En 5 E i El CONT E AT aga 1 BM sto 1 L i i HID BAD END i Aeos i san i d 1 0603 f l I I I it E I f 4 2 1 2 12V Input Source Power Supply Design Guidelines e The desired output for the power supply is 3 8V hence due to the big difference between the input source and the desired output a linear regulator is not suited and shall not be used A switching power supply will be preferable because of its better efficiency especially with the 2A peak current load represented by the GE863 GPS e When using a switching regulator a 500kHz or more switching frequency regulator is preferable because of its smaller inductor size and its faster transient response This allows the regulator to respond quickly to the current peaks absorption e For car PB battery the input voltage can rise up to 15 8V and this should be kept in mind when choosing components all components in the power supply must withstand this voltage e A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks a 100uF tantalum capacitor is usually suited e Make sure the low ESR capacitor on the power supply output usually a tantalum one is rated at least 10V e For Car applications a spike protectio
25. of them a proper hardware solution will be suggested and eventually the wrong solutions and common errors to be avoided will be evidenced Obviously this document cannot embrace the whole hardware solutions and products that may be designed The wrong solutions to be avoided shall be considered as mandatory while the suggested hardware configurations shall not be considered mandatory instead the information given shall be used as a guide and a starting point for properly developing your product with the Telit GE863 GPS module For further hardware details that may not be explained in this document refer to the Telit GE863 GPS Product Description document where all the hardware information is reported NOTICE EN The integration of the GSM GPRS GE863 GPS cellular module within user application shall be done according to the design rules described in this manual IT L integrazione del modulo cellulare GSM GPRS GE863 GPS all interno dell applicazione dell utente dovr rispettare le indicazioni progettuali descritte in questo manuale DE Die Integration des GE863 GPS GSM GPRS Mobilfunk Moduls in ein Ger t mu gem der in diesem Dokument beschriebenen Konstruktionsregeln erfolgen SL integracija GSM GPRS GE863 GPS modula v uporabni ki aplikaciji bo morala upo tevati projektna navodila opisana v tem priro niku SP La utilizaci n del modulo GSM GPRS GE863 GPS debe ser conforme a los usos para los cuales ha sido disefiado desc
26. output path but the various design requirements can be grouped into three different categories e handset earphone low power typically a handset e hands free earphone low power typically a earphone e car kit speakerphone high power typically a speaker The three groups have different power requirements usually the first two applications need only few mW of power which can be directly drained from the GE863 GPS pads provided a suited speaker is used This direct connect design is the cheaper and simpler solution and will be suited for the most of the earphone design requirements There s no need to decouple the output ear lines if a suited earpiece is connected For the last group the speakerphone a power amplifier is required to raise the output power up to 5 10W required in a car cabin application All the designs shall comply with the following guidelines e Where possible use a bridged earphone circuitry to achieve the maximum power output from the device e Keep the earphone traces on the PCB and wires as short as possible e f your application requires a single ended earpiece and you want a direct connection then leave one of the two output lines open and use only the other referred to ground Remember that in this case the power output is 4 times lower than the bridged circuit and may not be enough to ensure a good voice volume e Make sure that the earphone traces in the PCB don t cross or run parallel to noisy traces es
27. that means its voltage is lower than the trickle charging threshold then the charge must start slowly possibly with a current limited pre charging process where the current is kept very low with respect to the fast charge value the trickle charging During the trickle charging the voltage across the battery terminals rises when it reaches the fast charge threshold level the charging process goes into fast charge phase During the fast charge phase the process proceeds with a current limited charging this current limit depends on the required time for the complete charge and from the battery pack capacity During this phase the voltage across the battery terminals still raises but at a lower rate Once the battery voltage reaches its maximum voltage then the process goes into its third state Final charging The voltage measure to change the process status into final charge is very important It must be ensured that the maximum battery voltage is never exceeded otherwise the battery may be damaged and even explode Moreover for the constant voltage final chargers the constant voltage phase final charge must not start before the battery voltage has reached its maximum value otherwise the battery capacity will be highly reduced The final charge can be of two different types constant voltage or pulsed GE863 GPS uses constant voltage The constant voltage charge proceeds with a fixed voltage regulator very accurately set to the maximum battery v
28. z1mA e GPS antenna consumption external active antenna 20 mA The GSM system is made in a way that the RF transmission is not continuous else it is packed into bursts at a base frequency of about 216 Hz the relative current peaks can be as high as about 2A Therefore the power supply has to be designed in order to withstand with these current peaks without big voltage drops this means that both the electrical design and the board layout must be designed for this current flow If the layout of the PCB is not well designed a strong noise floor is generated on the ground and the supply this will reflect on all the audio paths producing an audible annoying noise at 216 Hz if the voltage drop during the peak current absorption is too much then the device may even shutdown as a consequence of the supply voltage drop 9 TIP The electrical design for the Power supply should be made ensuring it will be capable of a peak current output of at least 2 A z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 16 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 4 General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps the electrical design the thermal design the PCB layout 4 2 1 Electrical Design Guidelines The electrical design of the power supply depends strongly from the p
29. 007 14 Rev 4 20 09 06 7 5 2 Buffered Unbalanced Single Ended Microphone SINGLE ENDED MICROPHONE BUFFER 410 dB 3VLEXT MIG 5INGLE iD 3V EXT MIC SINGLE TtB oa 3768 R744 o 32 28 47k i GND 1 5 ogag a U704 GE863 e 3 153v912I1D ke m Mic ES PE GE DECOUPLING CAPACITORS Og lm Vt asd al Sas gt MS du y I pose oe NIN senes x Es 2 m 4 zu S286 5 C7419 R716 APE m MIC SES 100nF 4 EE mg B5 HE E oan h YEY T 8 TOMC rod du i r To 1 m 1 i 0603 0603 RU m a BE i ma eS GE863 MIS D S226 p i o5 B5 L ge Su E i Pn i i GNO GNO i 1 34 EXT MIC SINGLE 1 i g U704 D GE863 TS3VU18ID WEEET Mic 7 ars i 44 EX TMC SINGLE wt ou gt i i OT II i L i i i R717 R720 4 i 10K fy Da B o ON Na 59 EE Eu m 5 1 0603 a m i NG ES 0603 g 1 a 10 C725 LEE m A C72D R715 1000F usj BE 1 100nF AFK Yw 1 iby LGA gt e ee cece oe Baa NG si 16v E 0603 0603 0603 GNG GNG END The above schematic can be used for a single ended buffered unbalanced microphone the required biasing circuitry is not included Note also that the capacitor C3 is not needed The gains of the two amplifiers are given by the formulas R711 ia Gain inverting buffer zu R720 R708 Gai
30. 3 57 MHz and SIMIO has 9600Bps baud rate 9 2 EMI EMC This is a key aspect to consider designing an application based on TELIT module with internal antenna and or without a proper shielded box Some of these conditions may occur Antenna picks up digital noise coming from SIM card lines Antenna radiated field may interfere digital lines Digital lines in particular clock may radiate spurious in the surrounding space To overcome all these potential problems connection lines must be kept as short as possible and shielded SIM holder position has to be as far as possible from antenna RF bypass capacitors 10pF 33pF closed to SIM card SIM holder are another good care When connection is not short insertion of 10 1000hm resistor with 10 33pF capacitor RC filter is a good caution to improve EMI from SIMCLK line Do not insert resistor on SIMVCC SIMRST and SIMIO lines their use is not supported by SIM electrical interface 108 g paa gr Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 58 of 90 Pd e Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 9 3 ESD Take standard ESD caution if application based on TELIT module has SIM holder with contacts reachable from human body 9 4 SIM Supply Do not connect capacitance greater than 10nF to SIMVCC line Other notes SIMIN doesn t require any pull up resistor It is built in SIM
31. 6 and C727 are C726 1 21 4000 R719 7 10 10 F C727 1 21 4000 R711 7 2 65 10 F modified in 6 8nF f 4181HZ and 2 7nF f 2 3931Hz because of commercial values Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 49 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 8 OUTPUT LINES Speaker 8 1 Short description The Telit GE863 GPS provides two audio paths in receive section Only one of the two paths can be active at a time selectable by AXE hardware line or by AT command You must keep in mind the different audio characteristics of the receive blocks when designing 3 the Ear MT lines EPN1 and EPP1 are the Differential Line Out Drivers they can drive an external amplifier or directly a 16 Q earpiece at 12dBFS gt the Ear HF lines EPPA1 2 and EPPA2 are the Fully Differential Power Buffers they can directly drive a 162 speaker in differential balanced or single ended unbalanced operation mode FS acronym of Full Scale It is equal to OdB the maximum Hardware Analog Receive Gain of BaseBand Chip The Ear MT audio path should be used for handset function while the Ear HF audio path is suited for hands free function car kit Both receiver outputs are B T L type Bridged Tie Load and the OEM circuitry shall be designed bridged to reduce the common mode noise typically generated on the groun
32. Alternate function GPIO7 supports all three modes and can be input output buzzer output Alternate function All GPIO pads are 2 8V CMOS signals and their interface levels are the same specified in the paragraph 5 10 1 Using a GPIO Pad as INPUT The GPIO pads when used as inputs can be connected to a digital output of another device and report its status provided this device has interface levels compatible with the 2 8V CMOS levels of the GPIO If the digital output of the device to be connected with the GPIO input pad has interface levels different from the 2 8V CMOS then it can be connected to GPIO1 or can be buffered with an open collector transistor provided a 47KO pull up resistor is connected as seen in the paragraph 6 6 5V UART Level Translation 10 2 Using a GPIO Pad as OUTPUT The GPIO pads when used as outputs can drive 2 8V CMOS digital devices or compatible hardware When set as outputs the pads have a push pull output and therefore the pull up resistor may be omitted z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 61 of 90 lelit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 10 3Using the Alarm Output GPIO6 The GPIO6 pad when configured as Alarm Output is controlled by the GE863 GPS module and will rise when the alarm starts and fall after the issue of a dedicated AT command This output can be used to power up the GE863 GP
33. B mm 1 0 05 Placement of microvias not covered by solder resist is not recommended inside the Solder resist opening unless the microvia carry the same signal of the pad itself Holes in pad are allowed only for blind holes and not for through holes Recommendations for PCB pad surfaces Finish Layer thickness um Properties Electro less Ni 3 7 good solder ability protection high Immersion Au 0 05 0 15 shear force values 2 em pue forbidden without Telit Communications S p A written authorization All Right reserved page 78 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 The PCB must be able to resist the higher temperatures which are occurring at the lead free process This issue should be discussed with the PCB supplier Generally the wet ability of tin lead solder paste on the described surface plating is better compared to lead free solder paste 13 2 5 Solder paste Lead free Solder paste Sn Ag Cu 13 2 6 GE863 GPS Solder Reflow The following is the recommended solder reflow profile Temperature gt Critical Zone T to Tp t 25 C to Peak Time gt gt IPC 020b 5 1 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 79 of 90 Z Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 Profile Feature Pb Free Assembly
34. C103 TXD Serial data input TXD from DTE EE CMOS 2 8V 38 C104 RXD KJ Serial data output to DTE CMOS 2 8V ka C108 DTR uu Input for Data terminal ready signal DTR from DTE CMOS 2 8V 2 40 C105 RTS DI Input for Request to send signal RTS from DTE CMOS 2 8V EN C106 CTS O Output for Clear to send signal CTS to DTE PF CMOS 2 8V 42 C109 DCD KI Output for Data carrier detect signal DCD to DTE CMOS 2 8V 43 C107 DSR O Output for Data set ready signal DSR to DTE PF CMOS 2 8V 44 C125 RING O Output for Ring indicator signal RI to DTE PF CMOS 2 8V pp O Ho NG ON OFF Input command for switching power ON or OFF 47KQ Pull up to VBATT toggle command ar RESET fResetinput LE e GND EN Ground rer ao ANTENNA o GSH Antenna sup soon A AN a Go God we 51 GPIO7 I O GPIO7 BUZZER output CMOS 2 8V BUZZER PWRMON O Power ON Monitor ON Monitor CMOS2 8V 2 8V il i alae dl RFTXMON uu eee ALARM PL ae Pees RR Rd CAM_SCL ao fer ae Gk io Pion Debug CU CO GEL E r Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page g of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 Pin Signal 1 O Function Internal Type Pull up or po geio sz e son popo tt a Aa S a RESERVED ese SSCS SC o pac our o p
35. GA 2 QQVGA camera color O color 1 grayscale camera zoom 0 x1 1 x2 2 x4 camera timestamp 0 no 1 time only 2 data only 3 time amp data camera ON take photo see photo dimension where 38900 is the file dimension in bytes of the photo taken download the photo where data Correspond to the photo data in binary Repeating photo capture and download n times camera OFF page 73 of 90 Pd e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 13 Mounting the GE863 GPS on the Application Board 13 1General The Telit GE863 GPS module has been designed in order to be compliant with a standard lead free SMT process 13 ee Finishing amp Dimensions 0 85 0 1 SEZIONE A A Jil NNNNNNNNNNNN STIR 31 440 127 4 E x Pick area 0 87 0 087 page 74 of 90 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved Pd e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 INN O 2 UN j Lo Sim Ji ft mb Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 75 of 90 de e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 13 2 1 Recommended foot print for the application 31 40 O IQ 40 r A NH JT WIRING o
36. S e leli wireless solutions GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 EN Wes LAN b M b L 4 f d Making machines talk Z EM vk GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 This document is relating to the following products NA TF NG GE863 GPS 3 990 250 660 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 2 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 Contents DE OCT VEC 7 2 GE863 module CORHECUUHS o dod Wait S tO PIN FARINE MM I MENFE E IUE 8 21 A 23x3 n 0G 8 2 2 PINS LA S0 BH Lo 11 3 Hardware Commands Me aeii 12 3 1 Turning ON the GE863 GPS eesseessesssecssecssecssecesecesccesecesccesocesocesocesocesocesocesoosssossossesosssosessssssesssesssse 12 3 2 Turning OFF the GES863 GRS 14 3 21 Hardware shutdown GN NAAN O 14 3 2 2 Hardware Unconditional Shutdown ecccesccesccesecesecececscesecenecacecaeeesececeeeeeeseeeseeeaeceaecaeceaeceaeceeeaeeeaeeeaeeeneees 14 4 Power Supply m Nea 16 41 Power Supply Requirements cs cscccsccsssesseccsassseessoscoeecssenvecossoseesonesosecisessoosesseeoesocseseesens svstessessoosssosesee 16
37. S controlling microcontroller or application at the alarm time giving you the possibility to program a timely system wake up to achieve some periodic actions and completely turn off either the application and the GE863 GPS during sleep periods drammatically reducing the sleep comsumption to few pA In battery powered devices this feature will greatly improve the autonomy of the device 10 4 Using the Buzzer Output GPIO7 The GPIO7 pad when configured as Buzzer Output is controlled by the GE863 GPS module and will drive with appropriate square waves a Buzzer driver This permits to your application to easily implement Buzzer feature with ringing tones or melody played at the call incoming tone playing on SMS incoming or simply playing a tone or melody when needed by your application Q102 s2F BZ101 SOT 23 SMUS 1 227 SMBT2907A A sample interface scheme is included below to give you an idea of how to interface a Buzzer to the GPIO7 NOTE To correctly drive a buzzer a driver must be provided its characteristics depend on the Buzzer and for them refer to your buzzer vendor KE B ae Reproduction forbidden without Telit Communications S p A written authorization All Right AA page 62 of 90 Z Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 10 51PPS GPS Output 10 5 1 Description The Time Mark output 1PPS provides a one pulse per second signal to the user specific applic
38. aces SOS SY e eo popo asa es RESERVED RESERVE o L Aa Uie a e Go EN feud a ef xes j orsserarronm O L e Go ord ES ENT ro RESERVED eses pp mj os Joo ft SY a me 2 Ha aaa SS saa 75 A r aaa Pulse per Second signal ma ho 2 8V pull down GPIOTE vo ferio p mo lm HEEE Ir RX GPS BIN GPS serial Port RX SIRF BINARY PF CMOS 2 8V cow Ground Power 80 TX GPS BIN GPS serial Port TX SIRF BINARY PF CMOS 2 8V RESERVED RESERVED cg a cow Grund Per ss Ges ANT GPS ANTENNA pp s4 GND_GPS gt GPS ANTENNA GND Power 1 For the exclusive use of the Technical Support Service 2 When activating the Easy camera these pins will not be available for other use 3 On this pin a maximum of 10nF bypass capacitor is allowed Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 10 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 2 2 PINS LAYOUT 56 55 54 53 52 51 50 49 48 47 46 45 004 000 6000400 72 060046000 6000400 17 18 19 20 21 22 23 24 25 26 27 28 y Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 11 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 3 Hardware Commands 3 1 Turning ON t
39. an acoustic pressure of 4 7dBPa at 1kHz will have a further attenuation of 20dB due the 50cm distance Therefore a microphone having the suggested nominal sensitivity of 45dBV y Pa will produce a lower electrical that means MicVollage s 19 777 0 33 40 Setting the microphone gain at 10dB 3 times the signal in the nominal conditions on the Mic HF inputs s of GE863 GPS Telit Module will be Mic HF Level 0 33 10 3 3 1 10 a l l ll Hence in these conditions the signal level on the Mic HF input pads of the GE863 GPS is 10 dB 3 times lower than the nominal as suggested KE B EU Reproduction forbidden without Telit Communications S p A written authorization All Right page 40 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 7 2 General Design Rules There are several configurations for the audio paths but the most effective difference is between balanced and unbalanced microphone configuration It is highly recommended to keep the whole microphone path balanced even if this means having 2 wires connecting the microphone instead of one needed plus ground in the unbalanced case The balanced circuitry is more suited because of its good common mode noise rejection reducing the 216 Hz burst noise produced during the GSM transmissions e Where possible use balanced microphone circuitry e Keep the microphone traces on the PCB and wires
40. apacitor C720 and through a series resistor R718 of 470KQ TIP example of calculation Llet s assume you have a microphone with a sensitivity of 45dBV Pa and you want to use it in 2nd differential microphone path Mic HF inputs in normal spoken conditions at acoustic pressure of 4 7dBPa As reported at page XX the electrical level output from the microphone will be MicLevel 45 4 7 49 7 dBV ms but we have to consider 20dB loss due to the higher distance from the mouth of the talker 50cm MicLevel 49 7 20 69 7 dBV ms corresponding to MicVoltage 10 997 9 33 10 In order to have a signal of 1 mV 4 at the Mic HF inputs as suggested at TIP environment consideration the buffer must have a gain G4 Mic HF MicVoltage 1 10 3 0 33 10 3 3 or 10 dB Keeping in mind that balancing the line will double the signal to calculate the resistor values assign half of required gain Ga to each amplifier section And therefore Gs 1 5times or 3 52dB Choosing as 10kQ as the input resistance the corresponding values for the resistors on the buffer will be R711 Gs R708 1 510 15 kQ R719 Gs 1 R720 1 5 1 10 5 kQ The commercial values of 15kQ and 5 6kQ be accepted page 48 of 90 P d e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 As a consequence of the assigned values of the resistors the nominal values of C72
41. as fast switching ICs take care of the shielding of the antenna line by burying it inside the layers of PCB and surround it with Ground planes or shield it with a metal frame cover e f you don t have EM noisy devices around the PCB of GE863 GPS by using a strip line on the superficial copper layer for the antenna line the line attenuation will be lower than a buried one page 24 of 90 Z Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 5 3 GSM Antenna Installation Guidelines e Install the antenna in a place covered by the GSM signal e The Antenna must be installed to provide a separation distance of at least 20 cm from all persons and must not be co located or operating in conjunction with any other antenna or transmitter e Antenna shall not be installed inside metal cases e Antenna shall be installed also according Antenna manufacturer instructions 5 4 GPS Antenna Requirements The GE863 GPS module is not provided with an internal LNA amplifier The use of an active antenna is important to achieve a good performance The module is provided of an Antenna supply circuit with the following characteristics e Supply voltage referred to VBATT 3 4 to 4 2 V DC Supply enable controlled internally by the BB Current measurement circuit readable also with AT commands Voltage measurement circuit readable also with AT commands HW Protection for Antenna Short Circuit if consumption exceeds 40mA 5 4
42. ase Auo EAR HF Handsfree ear output phase Audio EAR_HF Handsfree ear output phase o Audo MIC_MT Handset microphone signal input phase Po Ado MIC MT Handset microphone signal input phase Po Ado MIC HF Handsfree microphone input phase o Ado MIC HF Handsfree microphone input phase Auo a ACA SIMCLK KI External SIM signal Clock PF 3V ONLY SIMRST O External SIM signal Reset PF 3V ONLY 20 SIMIO External SIM signal Data I O 3V ONLY SIMIN External SIM signal Presence active low CMOS 2 8V 22 SIMVCC ES External SIM signal Power 3 3V ONLY 23 ADC IN1 Analog Digital converter input o D 25 TX TRACE TX data for GPS control CMOS 2 8V 26 RX TRACE RX data for GPS control CMOS 2 8V A t AEn 1 Hy ae E 4 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 8 of 90 Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 Pin Signal 1 0 Function Internal Type Pull up a ao fo S tow swim opmemmer eno EIE aa a DRE A vau Power outputTor eneral accessories camera GPI04 O GPIO4 Configurable n purpose I O pin ha 2 8V CAM SDA Camera IIC interface 2 GPIO2 JDR I O GPIO2 Configurable es purpose O pin CMOS 2 8V Jammer Detect Output 2 GPIO1 GPIO1 EEE TE purpose I O pin CMOS 2 8V sce a esi Trae e cb AA
43. ation The 1PPS pulse is available at any time as soon as a fix is done This signal is a positive logic CMOS level output pulse that transitions from logic low condition to logic high at a 1 Hz rate 10 5 2 Pulse Characteristics The signal is available on BGA Ball 75 on GE863 GPS and on pin 26 of PL104 on EVK2 Adapter board CS1151 Type Output CMOS 2 8V Duration Typically 1us Pull up down Internal 100Kohm Pull down Il 5 ps 1 88 V D STOPPED OF Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 63 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 11 DAC and ADC section 11 1DAC Converter 11 1 1 Description The GE863 GPS module provides a Digital to Analog Converter The signal named DAC OUT is available on BGA Ball 63 of the GE863 GPS module and on pin 17 of PL104 on EVK2 Board CS1151 The on board DAC is a 10 bit converter able to generate a analogue value based a specific input in the range from O up to 1023 However an external low pass filter is necessary Min Max Units Voltage range filtered 0 2 6 Volt Range 0 1023 Steps The precision is 10 bits so if we consider that the maximum voltage is 2V the integrated voltage could be calculated with the following formula Integrated output voltage 2 value 1023 DAC OUT line must be integrated for example with a low band pass filter in order
44. ations while the Mic HF audio path is suited for hands free function car kit The Earphone applications should be made using the Mic HF audio path but DISABLING the echo canceller by software AT command If the echo canceller is left active with the Earphone then some echo might be introduced by the echo cancel algorithm Mic MT f differential microphone path line coupling line type coupling capacitor differential input resistance differential input voltage microphone nominal sensitivity analog gain suggested echo canceller type Mic HF 2 differential microphone path line coupling line type coupling capacitor differential input resistance differential input voltage microphone nominal sensitivity analog gain suggested echo canceller type AC balanced 2 100nF 50kQ S 1 03V 365MVims 45 ABV ms Pa 20dB handset AC balanced 2 100nF 50kQ S 65mV 23mV ms 45 ABV ms Pa 10dB car kit hands free page 38 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 p TIP definition of the nominal sensitivity of the microphone lines The nominal sensitivity of the microphone lines indicates the voltage level on the GE863 GPS pins present during normal spoken conditions For a handset the normal spoken conditions take place when the talker mouth is 7cm far from the microphone under these conditions the voice will produce an acoustic pressur
45. cator inside the bag indicates 1096 RH or more MA Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 83 of 90 Z Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 14 GE863 GPS EVK ADAPTER 14 1 Description This board permits to easily interface the module with the EVK2 and test its functionalities The board is called CS1151 For additional information on the EVK2 please refer to its user manual cod 1vv030000704 14 2 Interface Connectors The available connectors are USB connector USB type B GPS RF connector SMA Female GSM RF connector SMA Female Connectors to select the Serial port configuration PL101 PL 102 EVK connectors PL103 PL104 SO101 SO106 For position and pinout and additional info refer to picture 1 2 and EVK2 User manual 14 2 1 USB Connector This USB interface provides 2 serial ports that are related to the NMEA serial port and SIRF Binary serial port of GE863 GPS module With the 2 Jumpers on PL101 and PL 102 is possible to select if the Sirf Binary serial port will be available on the USB connector or directly connected to the second serial port of the modem GPS control Refer to EVK2 manual for Drivers installation 14 2 2 GPS RF Connector On this connector is possible to connect an active GPS antenna NOTE don t connect a GSM antenna on this connector The GPS section provides the DC sup
46. clock 1 SCLK l 8 17 GND Ground 2 AGND l 31 VAUX O Power Supply 3 AVDD28 l 5 GPIO9 O Camera Reset 4 RESET N l 7 MON1_CAM O Clock 5 CLK IN 8 17 GND Ground 6 DGND n c n c 7 DOUT 0 1 0 n c n c 8 DOUT 1 1 0 n c n c 9 DOUT 2 1 0 n c n c 10 DOUT 3 0 n c n c 11 DOUT_4 1 0 n c n c 12 DOUT 5 0 n c n c 13 DOUT_6 I O n c n c 14 DOUT 7 1 0 n c n c 15 DOUT 8 V0 n c n c 16 VCLKOUT O n c n c 17 VALIDH O n c n c 18 VALIDV O 31 VAUX O Power Supply 19 DVDD28 l 32 GPI04 l O 12C bus serial data 20 SDIN 1 0 8 17 GND Ground 21 PS1 6 GPIO8 O Camera power type selector 22 PS2 l 8 17 GND Ground 23 SHIELD Flash Enable 24 LED_CTRL O Filter the AVDD28 _Use a Buffer between module clk out MON1 CAM and camera clk in CLK IN Non connected page 68 of 90 Z e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 Fig 1 Camera Physical Detail amp Connector 630 20 025 0 30 3003 SECTION A A d PEPE DIMENSIONS mm 12 50 SECTION B B THX ma D GLASS PLASTIC WUSWALTON 55 544540 14 024 4 86 0 1 02 p 265 Fig 2 Camera Socket Connector p x RT No 20 Ligo aa 165 as io 192 us 195 120 114 Lio i23 mA s 150 sas o i 342 me Pe l 22 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 69 of 90 Z Telit
47. crophone Biasing cessere eese esee ee einen seen etes tastes senatus E sees nco noo nono rro noo E 42 TAT Balanced Microphone BIasing iere teet ttt GNG ANTUKIN 42 TAZ Unbalanced Microphone BIS ieiii ten ee rerit pese secet eati NGABA AA 43 7 5 Microphone Buffering vicsiccssinssssicscsscsssesssosensssnosseedssesonsssonesscsascscesvsessesscoonscedveossssbeesesscsososessaesarsonsssosees 45 735 1 Buffered Balanced Mies Kan e a eue e Ye pe dd 45 7 5 2 Buffered Unbalanced Single Ended Microphone ooocooncccoccnnconcnonononononannnonnnononncn nono conc on conc on ener nene 47 O OUTPUT LINEAS n 07 A A soaa reaksie seitas 50 8 1 Short description eee eee eee esee esee eee stress ooa Noso tosta sesso se tastes sons Ens rro nco none oa KoSo noc asses sns tn aea 50 8 2 Output Lines Characteristics 4 eere esee eee eee ee seen eese ta sente neta stesse tastes coo noo seta sesso seta stesso ncco conos 51 8 3 General Design Rules RR ncno conos 52 sl Noise lt RORIS UE IRURE RUP ELLE LL Ee E CER SEE 52 8 4 Handset Harphione D SIgn reete ete terne eo eee eene eh teo sevo Pete se eet seendsoseanesscevssvesecaezssssetesnavecteosey see 53 8 5 Hands Free Earphone Low Power Design 4 crece esee eee eene ernst nete etta seta seta seta seta setas etna s ena 54 8 6 Car Kit Speakerphone Design nn rese rae eoe eer eon ea e ooo Fase ae vo Ca voe 0p na a
48. ctrostatic discharges may damage the product itself Same cautions have to be taken for the SIM checking carefully the instruction for its use Do not insert or remove the SIM when the product is in power saving mode The system integrator is responsible of the functioning of the final product therefore care has to be taken to the external components of the module as well as of any project or installation issue because the risk of disturbing the GSM network or external devices or having impact on the security Should there be any doubt please refer to the technical documentation and the regulations in force Every module has to be equipped with a proper antenna with specific characteristics The antenna has to be installed with care in order to avoid any interference with other electronic devices and has to guarantee a minimum distance from the body 20 cm In case of this requirement cannot be satisfied the system integrator has to assess the final product against the SAR regulation The European Community provides some Directives for the electronic equipments introduced on the market All the relevant information s are available on the European Community website http europa eu int comm enterprise rtte dir99 5 htm The text of the Directive 99 05 regarding telecommunication equipments is available while the applicable Directives Low Voltage and EMC are available at http europa eu int comm enterprise electr equipment index en h
49. d End Ground Plane of antenna shall be equipotential to the GE863 GPS ground pins Furthermore if the device is developed for the US market and or Canada market it shall comply to the FCC and or IC approval requirements This device is to be used only for mobile and fixed application z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 27 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 5 5 GPS Antenna PCB Line Guidelines Ensure that the antenna line impedance is 50 ohm Keep the antenna line on the PCB as short as possible to reduce the loss Antenna line must have uniform characteristics constant cross section avoid meanders and abrupt curves Keep if possible one layer of the PCB used only for the Ground plane Surround on the sides over and under the antenna line on PCB with Ground avoid having other signal tracks facing directly the antenna line track The ground around the antenna line on PCB has to be strictly connected to the Ground Plane by placing vias once per 2mm at least Place EM noisy devices as far as possible from GE863 GPS antenna line Keep the antenna line far away from the GE863 GPS power supply lines Keep the antenna line far away from the GE863 GPS GSM RF lines If you have EM noisy devices around the PCB hosting the GE863 GPS such as fast switching ICs take care of the shielding o
50. d plane and to get the maximum power output from the device however also a single ended circuitry can be designed for particular OEM application needs KE ae Reproduction forbidden without Telit Communications S p A written authorization All Right I mn page of 90 8 2 Output Lines Characteristics Ear MT Differential Line out Drivers Path line coupling line type output load resistance internal output resistance signal bandwidth max differential output voltage differential output voltage SW volume level step number of SW volume steps Ear HF Power Buffers path line coupling line type output load resistance internal output resistance signal bandwidth max differential output voltage max single ended output voltage SW volume level step number of SW volume steps Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 DC bridged 214Q 4 Q typical 150 4000 Hz 3 dB 1310 mV rms typ open circuit 328mVrms 16 O 12dBFS 2dB 10 DC bridged 2140 40 gt 1 70 150 4000 Hz 3 dB 1310 MV ms typ open circuit 656 MVims typ open circuit 2dB 10 As Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 51 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 8 3 General Design Rules There are several configurations for the audio
51. damage it NOTE DON T USE any Ni Cd Ni MH and Pb battery types directly connected with GE863 GPS Their use can lead to overvoltage on the GE863 GPS and damage it USE ONLY Li lon battery types A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks a 100 F tantalum capacitor is usually suited e Make sure the low ESR capacitor usually a tantalum one is rated at least 10V A protection diode should be inserted close to the power input in order to save the GE863 GPS from power polarity inversion Otherwise the battery connector should be done in a way to avoid polarity inversions when connecting the battery The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A the suggested capacity is from 500mAh to 1000mAh KE B d Reproduction forbidden without Telit Communications S p A written authorization All Right ZA page 19 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 4 2 1 4 Battery Charge control Circuitry Design Guidelines The charging process for Li lon Batteries can be divided into 4 phases e Qualification and trickle charging e Fast charge 1 constant current e Final charge constant voltage or pulsed charging e Maintenance charge The qualification process consists in a battery voltage measure indicating roughly its charge status If the battery is deeply discharged
52. de 1vv0300714 Rev 4 20 09 06 O TIP environment consideration For hands free car kit microphone you must take into account the voice attenuation due to the distance between the microphone itself and the talker when designing the external microphone amplifier Not only you must consider that the microphone will pick up also ambient noise to overcome this problem it is preferable to set the gain of the microphone 10dB lower with respect to the calculated value for a nominal sensitivity The corresponding reduction in signal level will be compensated by an increased voice volume of the talker which will speak louder because of the ambient noise For a car cabin usually the distance between the microphone itself and the talker is 40 50cm in these conditions the attenuation can be considered as a thumb rule around 20aB For the earphone we shall distinguish two different types the earphones having the microphone sustained close to the mouth and the ones having the microphone on the earpiece cable The same considerations for the additional voice attenuation due to the distance from the microphone and the noise pick up can be made for the earphone having the microphone on the earpiece cable while the other kind of earphone shall be threaten as an handset y TIP how to compensate the losses in car cabin hands free condition The voice signal that in the normal spoken conditions produces on the microphone membrane
53. e GE863 GPS internal audio path from the external audio path Example of car kit amplifier schematic HIGH POWER EXT EAR AMPLIFIER 6w o leer i cles eL AA AA uei cy m ver as EE 1 i Aso 4 m E4P HF4 l aut x C913 A902 TO SPEAKER i lt The tnr 15k 1 3 OHM i nap Tee m al 3 as me in F i lt ERSTES z JEAP H MODE c902 caos Big 1 none onour 5 i in gt VA i mn any T PLOGd i 1 E f cain C308 i d Ol E20 el AUTE CONTROLLED uM 3 ALWAYS DN GONT E moa Ga GND GD AMPLI POWER CONTROL z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 55 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 8 7 The Evaluation Kit for Telit Modules EVK2 8 7 1 Short Description Telit supplies the Evaluation Kit for Telit modules EVK2 to assist the designer to develop his own applications based on GE863 GPS Telit module The EVK2 is formed by a mother board and a dedicated Telit module Interface Board with RF antenna connectors It provides a fully functional solution for a complete data phone application The motherboard has multiple power supply possibilities and is equipped with SIM card housing RS 232 serial port level translator direct USB1 1 connection and
54. e and fixed or mobile operating configurations Users and installers must be provided with antenna installation instructions and transmitter operating conditions for satisfying RF exposure compliance Manufacturers of mobile fixed or portable devices incorporating this module are advised to clarify any regulatory questions and to have their complete product tested and approved for FCC compliance page 88 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 16 SAFETY RECOMMANDATIONS READ CAREFULLY Be sure the use of this product is allowed in the country and in the environment required The use of this product may be dangerous and has to be avoided in the following areas U Where it can interfere with other electronic devices in environments such as hospitals airports aircrafts etc Q Where there is risk of explosion such as gasoline stations oil refineries etc It is responsibility of the user to enforce the country regulation and the specific environment regulation Do not disassemble the product any mark of tampering will compromise the warranty validity We recommend following the instructions of the hardware user guides for a correct wiring of the product The product has to be supplied with a stabilized voltage source and the wiring has to be conforming to the security and fire prevention regulations The product has to be handled with care avoiding any contact with the pins because ele
55. e incoming call condition NOTE According to V 24 RX TX signal names are referred to the application side therefore on the GE863 GPS side these signal are on the opposite direction TXD on the application side will be connected to the receive line here named TXD rx uart of the GE863 GPS serial port and viceversa for RX TIP For a minimum implementation only the TXD and RXD lines can be connected the other lines can be left open y provided a software flow control is implemented z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 30 of 90 The signals in the UART connector on the EVK are DCD RXD TXD DTR GND DSR RTS CTS RI GND Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 6 2 MODEM SERIAL PORT 2 GPS CONTROL This port is used to control the GPS part by the GSM part It is available on the following pins PIN NAME DESCRIPTION TYPE 25 TX TRACE TX Data for GPS control CMOS 2 8V 26 RX TRACE RX Data for GPS control CMOS 2 8V The typical integration requires connecting this pins to GPS serial port A PIN NAME NAME PIN 25 TX TRACE RX GPS BIN 78 26 RX TRACE lt _ TX GPS BIN 80 6 3 GPS SERIAL PORT A SIRF BINARY This port is carrying out the GPS navigation data in SIRF BINARY format The default configuration i
56. e of 4 7dBPa 1kHz on the microphone membrane y TIP electrical equivalent signal and operating voice levels At normal spoken conditions a microphone having the suggested nominal sensitivity of 45dB Vmy Pa will produce the electrical equivalent signal MicLevel 45 4 7 49 7 ABy ms that means s MicVoltage 10 7 2 3 3 10 Vins During a call this level varies according to the volume of the talker voice usually the following rough thumb rule for the dynamic range may be used 1 the talker is screaming This is the strongest voice level condition the signal increases by 20dB 2 the talker is whispering This is the lowest voice level condition the voice level decreases by 50dB These changes must be considered for designing the external microphone amplifier y TIP example of external microphone amplifier calculation Let s suppose to use the 1 differential microphone path In this case the maximum differential input voltage to Mic_MT lines is 365mMVms 1 03V pp corresponding to 8 76dBV Now we can calculate the maximum voltage gain of an external microphone amplifier Ga MicLevel 204B G 8 76dBV 49 7 20 G 8 76 40 9 20 G w you can set Gaz 20dB to use standard resistor values z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 39 of 90 Z Telit GE863 GPS Hardware User Gui
57. ease the power supply performances e The Bypass low ESR capacitor must be placed close to the Telit GE863 GPS power input pads or in the case the power supply is a switching type it can be placed close to the inductor to cut the ripple provided the PCB trace from the capacitor to the GE863 GPS is wide enough to ensure a dropless connection even during the 2A current peaks e The protection diode must be placed close to the input connector where the power source is drained e The PCB traces from the input connector to the power regulator IC must be wide enough to ensure no voltage drops occur when the 2A current peaks are absorbed Note that this is not made in order to save power loss but especially to avoid the voltage drops on the power line at the current peaks frequency of 216 Hz that will reflect on all the components connected to that supply introducing the noise floor at the burst base frequency For this reason while a voltage drop of 300 400 mV may be acceptable from the power loss point of view the same voltage drop may not be acceptable from the noise point of view If your application doesn t have audio interface but only uses the data feature of the Telit GE863 GPS then this noise is not so disturbing and power supply layout design can be more forgiving e The PCB traces to the GE863 GPS and the Bypass capacitor must be wide enough to ensure no significant voltage drops occur when the 2A current peaks are absorbed This is for the same
58. eeeee eene nenne enne nennen enne 76 13 22 Debug of the GE863 in Production essent eren trennen ener tenere nre enne nnene TI 13 2 3 LEME M 77 13 2 4 PCB pad Designer ee one atras TI 13 2 5 Nn arr O 79 13 2 6 GE863 GPS Solder Reflow Son po PIE ne GANAN Mo iii 79 13 2 7 Packing System c dra 81 13 2 8 Moisture Sensibility aai Nagiba aah eee otn Gud eerie aaa a ALA bA NGI eva 83 H GES63 GPS EVE ADAPTER ci kt onkk aude se tuscetaaqE S se osi aa loin Un EE KABA ELE Rd proa NBA 84 14 1 Tov AAA si ssre osson seiss sss oeps p soros s bensine Srbo V si e nss 84 14 2 Interface Connectors EH 84 14 2 1 USB CONNECLO0 NANA aa 84 14 2 2 GPS RE Connector RR S RATER BN N eee nate De 84 14 2 3 GSM RF COnmector gr E 85 14 2 4 Serial Port Configuration PL101 PL102 ooococcconocinononocconnconcnnncnnncnnnonononnnonnnnnnnnnn none no eren enne nennen ener 85 14 2 5 EVKE Connector aa AA E AA AA 85 14 2 6 EVK POB LAYO ainan a AA ABA NAA atu eim 86 15 Conformity Assessment ISSUES eee eeee esee ee eene eene eee tn esten esten sese tane seta sese tn sese tne s 00000000 ease eene sena 88 I6 SAFETY RECOMMANDATIONS ovina AKUBB ANAN 89 17 Document Change P M 90 ae Reproduction forbidden without Telit Communications S p A written authorization All Right 2 page of 90 Z Telit GE863 GPS
59. een the calls and the heat sink could be smaller than the calculated one for 500mA maximum RMS current or even could be the simple chip package no heat sink Moreover in the average network conditions the device is requested to transmit at a lower power level than the maximum and hence the current consumption will be less than the 500mA being usually around 150mA z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 21 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 For these reasons the thermal design is rarely a concern and the simple ground plane where the power supply chip is placed can be enough to ensure a good thermal condition and avoid overheating For the heat generated by the GE863 GPS you can consider it to be during transmission 1W max during CSD VOICE calls and 2W max during class10 GPRS upload This generated heat will be mostly conducted to the ground plane under the GE863 GPS you must ensure that your application can dissipate it 4 2 3 Power Supply PCB layout Guidelines As seen on the electrical design guidelines the power supply shall have a low ESR capacitor on the output to cut the current peaks and a protection diode on the input to protect the supply from spikes and polarity inversion The placement of these components is crucial for the correct working of the circuitry A misplaced component can be useless or can even decr
60. eep the circuit balanced NOTE The cable to the microphone should not be shielded instead a twisted pair cable shall be used NOTE The microphone sensitivity changes with the value of R2 and R3 Usually the microphones are characterized with 2kQ biasing resistance so try to keep the sum of R2 and R3 around 2kQ Refer to your microphone manufacturer for the mic characteristics 7 4 2 Unbalanced Microphone Biasing The unbalanced microphone biasing voltage should be obtained from a dedicated voltage regulator in order to eliminate the noise present on the power lines This regulator can be the same for all the audio paths The microphone should be supplied from a capacitor multiply circuit For example a circuit for the unbalanced microphone biasing can be 4 3V MIC MIC Biasing Regulator Capacity multiply circuit aaa dada dada aadd aaa PSS SS Se SSS Ske aaa ada dada U1 LP29B041M5x 3 0 V 1N v OUT GND C1 P iouF ON OFF Nox 4v LOZA CONTB KA Mads GNO AO Electret microphone Moc T n i 1 T T 1 A pa Snielded 1 To Mic Buffer amplifier Cable 5 Mit i i mc H H i P ca 2 220nF e 10v paaa a GND GNO ee eee Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 43 of 90 oo A Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4
61. f the antenna line by burying it inside the layers of PCB and surround it with Ground planes or shield it with a metal frame cover If you don t have EM noisy devices around the PCB of GE863 GPS by using a strip line on the superficial copper layer for the antenna line the line attenuation will be lower than a buried one 5 6 GPS Antenna Installation Guidelines The GE863 GPS due to its characteristics of sensitivity is capable to perform a Fix inside the buildings In any case the sensitivity could be affected by the building characteristics i e shielding The Antenna must not be co located or operating in conjunction with any other antenna or transmitter Antenna shall not be installed inside metal cases Antenna shall be installed also according Antenna manufacturer instructions z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 28 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 6 Serial Ports The serial port on the Telit GE863 GPS is the core of the interface between the module and OEM hardware 4 serial ports are available on the module e MODEM SERIAL PORT e MODEM SERIAL PORT 2 GPS CONTROL PORT e GPS SERIAL PORT A SIRF BINARY e GPS SERIAL PORT B NMEA 6 1 MODEM SERIAL PORT Several configurations can be designed for the serial port on the OEM hardware but the most common are RS232 PC com port microcontrol
62. h For these reasons when the power output of the GE863 GPS is not enough or if the speaker characteristics are different from the suggested then it is preferable to use an amplifier to increase the power and current output capabilities Again the output from the GE863 GPS is bridged and both lines should be used where possible as inputs to the power amplifier This ensures a higher common mode rejection ratio reducing the GSM current busts noise on the speaker output In this case the EAR MT lines from the GE863 GPS should be AC coupled with a ceramic capacitor of 100nF or bigger It is always desirable to have a mute control on the amplifier in order to turn it off while the device is not sending signal to the output in this manner the amplifier background noise which may be audible during idle conditions is cut off A principle schematic may be le la lo LP H2 C3 JEAR MTt EAR QUT HOOnF HMOOnF C2 R1 1 RS JEAR MT vcc 2 E 1uF a 47K 17 GND GND KE eos Reproduction forbidden without Telit Communications S p A written authorization All Right 2 page of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 The resulting gain and high pass cut can be obtained with the formula edt R2 req Hz Hara L And an example of internal Ear amplifier could be
63. hat the negative signal voltage must be less than OV and hence some sort of level translation is always required The simplest way to translate the levels and invert the signal is by using a single chip level translator There are a multitude of them differing in the number of driver and receiver and in the levels be sure to get a true RS232 level translator not a RS485 or other standards By convention the driver is the level translator from the 0 3V UART level to the RS232 level while the receiver is the translator from RS232 level to 0 3V UART In order to translate the whole set of control lines of the UART you will need 5 driver 3 receiver z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 32 of 90 e Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 NOTE The digital input lines working at 2 8VCMOS have an absolute maximum input voltage of 3 75V therefore the O level translator IC shall not be powered by the 3 8V supply of the module Instead it shall be powered from a 2 8V 3 0V dedicated power supply This is because in this way the level translator IC outputs on the module side i e GE863 GPS inputs will work at 3 8V interface levels stressing the module inputs at its maximum input voltage This can be acceptable for evaluation purposes but not on production devices NOTE In order to be able to do in circuit repr
64. he GE863 GPS To turn on the GE863 GPS the pad ON must be tied low for at least 1 seconds and then released The maximum current that can be drained from the ON pad is 0 1 mA A simple circuit to do it is ON Power ON impulse NY 7707 GND NOTE don t use any pull up resistor on the ON line it is internally pulled up Using pull up resistor may bring to latch up problems on the GE863 GPS power regulator and improper power on off of the module The line ON must be connected only in open collector configuration NOTE In this document all the lines that are inverted hence have active low signals are labeled with a name that O ends with a or with a bar over the name NOTE The GE863 GPS turns fully on also by supplying power to the Charge pad provided there s a battery on the O vearr pads page 12 of 90 P d e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 For example 1 Let s assume you need to drive the ON pad with a totem pole output of a 3 5 V microcontroller uP OUTTX ON 5 6 32 uP_OUT 1 O BC847BW S T 323 Fs T3 8 4 ov cl L 1s Power ON OFF inpulse GND 2 Let s assume you need to drive the ON pad directly with an ON OFF button OND Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 13 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06
65. irements ANTENNA REQUIREMENTS Frequency range Standard Dual Band GSM DCS frequency range or Standard Quad Band GSM DCS PCS frequency range if used for all four bands Bandwidth 80 MHz in GSM 8 170 MHz in DCS amp 140 MHz PCS band Gain Gain 3dBi Impedance 50 ohm Input power gt 2 W peak power VSWR absolute lt 10 1 max VSWR lt 2 1 recommended When using the Telit GE863 GPS since there s no antenna connector on the module the antenna must be connected to the GE863 GPS through the PCB with the antenna pad In the case that the antenna is not directly developed on the same PCB hence directly connected at the antenna pad of the GE863 GPS then a PCB line is needed in order to connect with it or with its connector gt EPFL mg Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 23 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 This line of transmission shall fulfil the following requirements ANTENNA LINE ON PCB REQUIREMENTS Impedance 50 ohm Max Attenuation 0 3 dB No coupling with other signals allowed Cold End Ground Plane of antenna shall be equipotential to the GE863 GPS ground pins Furthermore if the device is developed for the US market and or Canada market it shall comply to the FCC and or IC approval requirements This device is to be used only f
66. ler UART 2 8V 3V Universal Asynchronous Receive Transmit microcontroller UART 5V or other voltages different from 2 8V Depending from the type of serial port on the OEM hardware a level translator circuit may be needed to make the system work The only configuration that doesn t need a level translation is the 2 8V UART The serial port on the GE863 GPS is a 2 8V UART with all the 7 RS232 signals It differs from the PC RS232 in the signal polarity RS232 is reversed and levels The levels for the GE863 GPS UART are the CMOS levels Absolute Maximum BE Not THAN Parameter digital pad when on analog pads when on eos Reproduction forbidden without Telit Communications S p A written authorization All Right i page of 90 Z Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 Operating Range Interface levels 2 8V CMOS Level Lee Min Max input Tow level V Output high level Vou 2 2V Output low level Vo py 0 35v The signals of the GE863 GPS serial port are Pin Pad Number Number 1 DCD 42 Data Carrier Detect Output from the GE863 GPS that Pe t tx uart rx uart dtr uart Ready DTE READY condition 45 48 50 56 dsr uart indicates the module is ready rts uart Hardware flow control KE M CTS Clear to Send Output from the GE863 GPS that controls cts uart the Hardware flow control RI Ring Indicator Output from the GE863 GPS that ri uart indicates th
67. m A NT TP yal 2 NOTE Pads 81 82 83 and 84 are not in line with the others Please check the quotes f 7 18 19 20 A DW 2B 24 25 2 MN 28 1 70 B 00 2 00 zu Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 76 of 90 Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 13 2 2 Debug of the GE863 in Production To test and debug the mounting of the GE863 we strongly recommend to foreseen test pads on the host PCB in order to check the connection between the GE863 itself and the application and to test the performance of the module connecting it with an external computer Depending by the customer application these pads include but are not limited to the following signals e TXD RXD ON OFF RESET GND VBATT TX_TRACE RX_TRACE PWR_CTL 13 2 3 Stencil Stencil s apertures layout can be the same of the recommended footprint 1 1 we suggest a thickness of stencil foil gt 120um 13 2 4 PCB pad Design Non solder mask defined NSMD type is recommended for the solder pads on the PCB Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 77 of 90 Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 Recommendations for PCB pad dimensions Ball pitch mm 2 Solder resist opening diameter A mm 1 150 Metal pad diameter
68. n diode should be inserted close to the power input in order to clean the supply from spikes e A protection diode should be inserted close to the power input in order to save the GE863 GPS from power polarity inversion This can be the same diode as for spike protection 143 C3 eos Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 18 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 An example of switching regulator with 12V input is 12Y input switching regulator 2 A 500 99 T12W INPUT 50202 T ANH 3 8V OUTPUT PRES B DD3318 0603 E a han vs C21D z icour SHINY SENSI gt le m C207 C206 D203 ov enr sone sour pur bi STPEA4402 GONT D R203 hr X7A GND 2 a TE ark 35v 500124 E 1 BnF 2503 CONT E 17 S CRID R204 4 FR 5 CAD BNO 4 2 1 3 Battery Source Power Supply Design Guidelines e The desired nominal output for the power supply is 3 8V and the maximum voltage allowed is 4 2V hence a single 3 7V Li lon cell battery type is suited for supplying the power to the Telit GE863 GPS module The three cells Ni Cd or Ni MH 3 6 V Nom battery types or 4V PB types MUST NOT BE USED DIRECTLY since their maximum voltage can rise over the absolute maximum voltage for the GE863 GPS and
69. n not inverting buffer 1 Assigning half of overall gain to each amplifier you will obtain the requested gain because of doubling the microphone signal path in fact by the use of two amplifiers the upper as inverting and the lower as not inverting configuration we obtain an additional 6dB gain 2 times Remember the not inverting amplifier section gain shall not be less than 1 Like for the balanced buffered microphone the amplifier overall gain can be modify changing the value of resistor R719 R720 and R711 and as a consequence the capacitors C726 and C727 It is advisable to change R708 only if you have difficulty to find a commercial value for R711 in this case change R708 as little as possible The 3dB bandwidth is given by the approximated formula considering C725 gt gt C726 las C eos Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 47 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 Hz 1 1 27 R719 C726 2x R711 C727 freq The buffer bandwidth at 3dB shall be 4KHz Note that the biasing of the operational amplifier is given for the inverting amplifier by the series divider R714 R715 The 100nF capacitor C719 is needed to filter the noise that could be coupled to that divider For the not inverting operational amplifier the biasing is given by a different divider R715 R717 with the c
70. ogramming of the GE863 GPS firmware the serial port on the Telit O GE863 GPS shall be available for translation into RS232 and either it s controlling device shall be placed into tristate disconnected or as a gateway for the serial data when module reprogramming occurs Only RXD TXD GND and the On off module turn on pad are required to the reprogramming of the module the other lines are unused All applicator shall include in their design such a way of reprogramming the GE863 GPS An example of level translation circuitry of this kind is U1 13v 1CL3807CA 550P 24 mk m Roc 2 T x oO wm 10 vee 2 EIJ A O oo E alo O a Eu 12 14 4 C1 vt TIED DHZTO gt 13 e m a ac m x u oy Cat aQ E DATO O 5 ha 14 15 c2 yo mz uU Das o STRA 197 7 o bs GND dcd_uart gt T1 IN T1 OUT DED RS232 5 3 tx uant O T2 1N T2_QUT DO TA AS2ae 18 1 dsr uart Lo 34 13 IN TR3 OUT DB8BH R5238 18 24 cts_uart L p m T4 IN T4 QUT CTS R5238 21 20 ri uart 2 75_ IN T5 0UT AI H5292 5 4 rx uart lt R1 QUT BILIN p lt BRx R8232 22 23 rts_uart lt A2 0UT R2 1N HATS AS232 17 16 dtr_uart lt _ PI DUT R3 IN DTR RS8238 GND B B Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 33 of 90 Z Telit GE863 GPS Hardware Use
71. oltage and hence the current will decrease while the battery is becoming charged When the charging current falls below a certain fraction of the fast charge current value then the battery is considered fully charged the final charge stops and eventually starts the maintenance The pulsed charge process has no voltage regulation instead the charge continues with pulses Usually the pulse charge works in the following manner the charge is stopped for some time let s say few hundreds of ms then the battery voltage will be measured and when it drops below its maximum value a fixed time length charging pulse is issued As the battery approaches its full charge the off time will become longer hence the duty cycle of the pulses will decrease The battery is considered fully charged when the pulse duty cycle is less than a threshold value typically 10 the pulse charge stops and eventually the maintenance starts The last phase is not properly a charging phase since the battery at this point is fully charged and the process may stop after the final charge The maintenance charge provides an additional charging process to compensate for the charge leak typical of a Li lon battery It is done by issuing pulses with a fixed time length again few hundreds of ms and a duty cycle around 5 or less This last phase is not implemented in the GE863 GPS internal charging algorithm so that the battery once charged is left discharging down to a certain threshold
72. or mobile and fixed application The antenna s used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co located or operating in conjunction with any other antenna or transmitter End Users must be provided with transmitter operation conditions for satisfying RF exposure compliance OEM integrators must ensure that the end user has no manual instructions to remove or install the GE863 GPS module Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed operating configurations 5 2 GSM Antemna PCB line Guidelines e Ensure that the antenna line impedance is 50 ohm e Keep the antenna line on the PCB as short as possible since the antenna line loss shall be less than 0 3 dB e Antenna line must have uniform characteristics constant cross section avoid meanders and abrupt curves e Keep if possible one layer of the PCB used only for the Ground plane e Surround on the sides over and under the antenna line on PCB with Ground avoid having other signal tracks facing directly the antenna line track e The ground around the antenna line on PCB has to be strictly connected to the Ground Plane by placing vias once per 2mm at least e Place EM noisy devices as far as possible from GE863 GPS antenna line e Keep the antenna line far away from the GE863 GPS power supply lines e f you have EM noisy devices around the PCB hosting the GE863 GPS such
73. ower source where this power is drained We will distinguish them into three categories e 5Vinput typically PC internal regulator output e 12V input typically automotive e Battery 4 2 1 1 5V input Source Power Supply Design Guidelines e The desired output for the power supply is 3 8V hence there s not a big difference between the input source and the desired output and a linear regulator can be used A switching power supply will not be suited because of the low drop out requirements e When using a linear regulator a proper heat sink shall be provided in order to dissipate the power generated e A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current absorption peaks close to the GE863 GPS a 100yF tantalum capacitor is usually suited e Make sure the low ESR capacitor on the power supply output usually a tantalum one is rated at least 10V e A protection diode should be inserted close to the power input in order to save the GE863 GPS from power polarity inversion KE ae Reproduction forbidden without Telit Communications S p A written authorization All Right I mn page of 90 Z Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 An example of linear regulator with 5V input is t5v input linear regulator I E l I I E l l l l l I I I I I l l I I E l l i i 3 8V
74. pecially the power line e The cable to the speaker shall be a twisted pair with both the lines floating for the bridged output type shielded with the shield to ground for the single ended output type 8 3 1 Noise Filtering The I O of the PCB should have a noise filter close to the connector to filter the high frequency GSM noise The filter can be a M formed by 2 capacitor and a inductance with the one capacitor of 39pF 0603 case and the other capacitor of 1nF 0603 the inductance shall have a value of 39uH z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 52 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 8 4 Handset Earphone Design As seen previously a 160 earpiece can be directly connected to the output pads EAR MT and EAR MT of the GE863 GPS This solution is often the more cost effective reducing the components count to a minimum There are several limitations to the use of this solution speaker direct connect imposes the speaker characteristics to be almost exactly the suggested ones otherwise the power output may be reduced if speaker impedance is bigger than 160 or the GE863 GPS ear port may be damaged if speaker impedance is less than 15Q The other limitation of the speaker direct connection is the power output capability of the GE863 GPS which is limited and for some particular applications may not be enoug
75. ply for the active antenna B eos Reproduction forbidden without Telit Communications S p A written authorization All Right page 84 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 14 2 3 GSM RF Connector On this connector is possible to connect a GSM antenna 14 2 4 Serial Port Configuration PL101 PL102 With this jumper setting is possible to configure the serial port 1 SIRF BINARY port connected to MODEM port 2 1 1 PL101 PL102 2 SIRF BINARY port available on USB connector 1 1 PL101 PL102 14 2 5 EVK Connectors Refer to picture 2 and to EVK2 documentation for the pinout y Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 85 of 90 Z e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 14 2 6 EVK PCB Layout picture 1 main connectors position al GSM E GPS woar eoert GE863 GPS asaro voar page 86 of 90 P d e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 picture 2 EVK connectors pinout ul o zo EE 686 e 5 0 A t og o gt c a JI gt c 3 oczzrzz gt 7 gt SS 55056 353 2 55 ew LI 9 9 99 09090909 O DD O D BY DB MW DB W BM MW PB ub 0 0 0 9 09 O O B 9 Oo 9 MW LJ FE E 7 a CLocwrs O a ao Oka a z7 70O 87 Kk k a zz s gt 63 5550 5wu 4 66 8 5 o2g00t7g5002652
76. r Guide 1vv0300714 Rev 4 20 09 06 The RS232 serial port lines are usually connected to a DB9 connector with the following layout DCD AS232 DSR RS232 m OC TX RS232 z O mo RTS AS232 CT O RX RS232 O wo CTS_AS232 OTR_AS232 lt _ T Ca RI RS232 C Qu ha 7 6 6 5V UART Level Translation If the OEM application uses a microcontroller with a serial port UART that works at a voltage different from 2 8 3V then a circuitry has to be provided to adapt the different levels of the two sets of signals As for the RS232 translation there are a multitude of single chip translators but since the translation requires very few components then also a discrete design can be suited For example a possible inexpensive translator circuit for a 5V driver can be BCR22PN WPS 501 363 TO TxD ByY C FROM OEM GM862 HARDWARE lt TXB 3v y Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 34 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 and for a 5V receiver 010310 1541 gt PMIRETL H1 ATK BA Dapa G1 BCRPEPN WPS 507 363 50103 1x01 2 gu NOTE The UART input line TXD rx uart of the GE863 GPS is NOT internally pulled up with a resistor so there may be the need to place an external 47KQ pull up resistor either the DTR
77. ritos en este manual del usuario FR L int gration du module cellulaire GE863 GPS GSM GPRS dans l application de l utilisateur sera faite selon les r gles de conception d crites dans ce manuel HE 22907 raa Sw DX WUPNA HANA MI 20022 MUNA nvnim ns nw WIND m wnicrWa 21071 ny GE863 GPS The information presented in this document is believed to be accurate and reliable However no responsibility is assumed by Telit Communication S p A for its use nor any infringement of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent rights of Telit Communication S p A other than for circuitry embodied in Telit products This document is subject to change without notice ba NG y Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 7 of 90 Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 2 GE863 module connections 2 1 PIN OUT ey See JEN Pull up 1 emos referir cwos2w 7 com voferor A emo wopmon eweszev GP00 A ELSE E GPIO9 I O GPIO9 CAM RST 2 CMOS 2 8V CAM_RST GPIO8 I O GPIO8 CAM ON 2 CMOS 2 8V CAM ON CAM CLK amera clock 2 CMOS28V EA p GN Power Ground Handset earphone signal output phase EAR MT Handset earphone signal output ph
78. ro aaepe IPOs ane in anuna 55 8 7 The Evaluation Kit for Telit Modules EV KO cesse esee eese e ense tnnt n enata setas n sto s etas enses tosta as 56 87 1 Short D scription coerente Hee P RO RE EE D HORE Fe ee riora li pinana iei ege rin ebat cete dias 56 8 7 2 EVK2 Audio Lines Characteristics sees EE a 57 9 SIM DESIGN GUIDES MC sisis 58 9 1 Data Inte Grit y 3 GT BAKURAN NAG so ossis 58 92 AA TABBED BEE 58 V MEME O DAA AA AA 59 94 SIM E AA 59 9 5 SCHEMATIC si ssssessssssececsssonssscsssiedscssnnsvanssecgesesastonsosssdedasseedsssetnsessesesdeessoasbsesesdasassssesaassoakeussussseaanssane 59 96 LAYOUT ee 60 10 General Purpose NO iaa 61 10 1 SIE ASA us esssS rsr raSi o ssas ESENE usss NEEE ESK SESS 61 10 2 Using a GPIO Pad as OUTPUT e0 0000 n0 eee e eee en eee G0 soto tne 00ANG enses tease eaae seen asse ease eese setae KNA KANONG 61 10 3 Using the Alarm Output GPIO6 eeeeee eere scenes eene enses estote stes to sete stan seen seen setas seas ette sees sae 62 10 4 Using the Buzzer Output GPIQJ7 7 a eren repr aerea erae t esa rea Prae EAR aaa 62 LE g 4 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 4 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 10 5 IPPS GPS Output m
79. s 57600 bps 8 n 1 It is available on the following pins PIN NAME DESCRIPTION TYPE 78 RX GPS BIN GPS RX Data Sirf Binary CMOS 2 8V 80 TX GPS BIN GPS TX Data Sirf Binary CMOS 2 8V The typical integration requires connecting this pins to MODEM serial port 2 eos Reproduction forbidden without Telit Communications S p A written authorization All Right 2 KE page of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 6 4 GPS SERIAL PORT B NMEA This port is carrying out the GPS navigation data in NMEA 0183 format The default configuration is 4800 bps 8 n 1 It is available on the following pins PIN NAME DESCRIPTION TYPE 68 TX GPS GPS TX Data NMEA CMOS 2 8V 73 RX GPS GPS RX Data NMEA CMOS 2 8V GPS RX Lines and TX lines may need a dual supply isolation buffer like an FXLP34 to avoid CMOS high states while in POWER SAVING 6 5 RS232 Level Translation In order to interface the Telit GE863 GPS with a PC COM port or a RS232 EIA TIA 232 application a level translator is required This level translator must invert the electrical signal in both directions change the level from 0 3V to 15 15V Actually the RS232 UART 16450 16550 16650 amp 16750 chipsets accept signals with lower levels on the RS232 side EIA TIA 562 allowing for a lower voltage multiplying ratio on the level translator Note t
80. so that it is cycled from full charge to slight discharge even if the battery charger is always inserted This guarantees that anyway the remaining charge in the battery is a good percentage and that the battery is not damaged by keeping it always fully charged Li lon rechargeable battery usually deteriorate when kept fully charged i 49 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 20 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 Last but not least in some applications it is highly desired that the charging process restarts when the battery is discharged and its voltage drops below a certain threshold GE863 GPS internal charger does it As you can see the charging process is not a trivial task to be done moreover all these operations should start only if battery temperature is inside a charging range usually 5 C 45 C The GE863 GPS measures the temperature of its internal component in order to satisfy this last requirement it s not exactly the same as the battery temperature but in common application the two temperature should not differ too much and the charging temperature range should be guaranteed NOTE For all the threshold voltages inside the GE863 GPS all threshold are fixed in order to maximize Li lon battery performances and do not need to be changed NOTE In this application the battery charger input current mus
81. t be limited to less than 400mA This can be done by using a current limited wall adapter as the power source 4 2 2 Thermal Design Guidelines The thermal design for the power supply heat sink should be done with the following specifications e Average current consumption during transmission PWR level max rms 500mA e Average current consumption during transmission Y PWR level min rms 100mA e Average current during Power Saving 4mA e Average current during idle Power Saving disabled 19mA e Average GPS current during Power Saving 1mA e Average GPS current during Tracking Power Saving disabled 60mA NOTE The average consumption during transmissions depends on the power level at which the device is requested to transmit by the network The average current consumption hence varies significantly TIP The thermal design for the Power supply should be made keeping an average consumption at the max transmitting level during calls of 500mA rms plus 60mA rms for GPS in tracking mode Considering the very low current during idle especially if Power Saving function is enabled it is possible to consider from the thermal point of view that the device absorbs current significantly only during calls If we assume that the device stays into transmission for short periods of time let s say few minutes and then remains for a quite long time in idle let s say one hour then the power supply has always the time to cool down betw
82. t i EH S o4 oF E iB O OT e 8 oe mo t PES on m dis i B25 a Oe qa Ma By ile E 0 i Ya of ul 13 bla ca EE oF 3 Og IT oldid 188 tua a noc 55 E o A s NAT 188 som vee E of Ex 3 oll a a D pL T l ipin 8 o l or l NM ote rdg Ed zl l i i Seco olt nalulong 5 E Ka i 7 qoe pom 7 5156 188 1 ara O E ries t bcc la sua ANN ot sara E ot po bap Ya I a op Er rgo T je T paba ES Tas ize i us a i Lea s ware st poda gg i gt I x i 131131 I nt son l ngi cur T y I i ua ol E i sls or 5 s E r B 1 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 72 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 12 1 5 Example usage script for camera Camera setting shown here are the defaults ones gt AT CAMSEL 0 OK gt AT CMODE 0 OK gt AT CAMQUA 0 OK gt AT CAMRES 0 OK gt AT CAMCOL 0 OK gt AT CAMZOOM 0 OK gt AT CAMT XT 0 OK Taking an reading a photo gt AT CAMEN 1 OK SAT TPHOTO OK gt AT OBJL OBJL Snapshot 38900 OK gt AT RPHOTO data OK SAT TPHOTO OK gt AT RPHOTO data OK gt AT CAMEN O only Transchip camera camera selection 0 auto 1 agilent 2 transchip camera mode 0 day 1 night camera quality 0 low 1 medieum 2 high camera resolution 0 VGA 1 QV
83. te the receiver The supply voltage most accept the range between 3 4 to 4 2 V DC In highly integrated environments rich with potential interference SiRF suggests design implementations with PRE filters The module s GPS input is already provided of a SAW filter As Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 26 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 As suggested on the Product Description the external active antenna for a Telit GE863 GPS device shall fulfill the following requirements ANTENNA REQUIREMENTS Frequency range 1575 42 MHz GPS L1 Bandwidth 1 023 MHz Gain 1 5 dBi Gain 4 5 dBi Impedance 50 ohm Amplification Typical 25dB max 27dB Supply voltage Must accept from 3 to 5 V DC Current Typical 20 mA 40 mA max consumption When using the Telit GE863 GPS since there s no antenna connector on the module the antenna must be connected to the GE863 GPS through the PCB with the antenna pad In the case that the antenna is not directly developed on the same PCB hence directly connected at the antenna pad of the GE863 GPS then a PCB line is needed in order to connect with it or with its connector This line of transmission shall fulfil the following requirements ANTENNA LINE ON PCB REQUIREMENTS Impedance 50 ohm No coupling with other signals allowed Col
84. tinuous direct output of GPS NMEA sentences geographical coordinates from modules with GPS For further detailed description refer to Technical Specification 30276st10285a r3 8 7 2 EVK2 Audio Lines Characteristics Low Power Audio1 Outputs Ear MT line line coupling line type load impedance signal bandwidth max output max differential output voltage Low Power Audio2 Outputs Ear HFt line e line coupling line type load impedance signal bandwidth max single ended output voltage High Power Audio1 Audio2 Outputs line coupling line type load impedance signal bandwidth maximum power output THD N AC single ended referred to GND 2160 150 4000 Hz 3 dB 655MV ms open circuit 164mMV ims typ 16 Q 12dBFS AC single ended referred to GND 2160 150 4000 Hz 3 dB 655MV ms open circuit DC balanced 280 150 4000 Hz 3 dB 500 mW 280 1 350mW page 57 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 9 SIM DESIGN GUIDES In all Telit modules there are five pins for SIM card holder connection These lines are SIMVCC SIM Power supply SIMRST SIM Reset SIMIO SIM Data SIMIN SIM Presence Absence SIMCLK SIM Clock SIM connection must take in account of four key issues 9 1 Data Integrity Standard rules for digital layout and routing must be followed taking in consideration that SIMCLK has frequency of
85. tm page 89 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 17 Document Change Log Revision ISSUE 0 ISSUE 1 ISSUE 2 ISSUE 3 ISSUE 4 Date 21 02 06 21 03 06 21 08 06 07 09 06 20 09 06 Changes First release Audio Levels adaptation GPS antenna integration Par 2 2 2 4 4 added chapter 8 for SIM Holder integration added chapter 9 5 1PPS signal added ADC 8 DAC added pinout description and reflow info modified power ON time to 1 sec Par 2 1 Updated pinout with Python Debug 5 4 5 42 accepted consumption on LNA Pin out PWRMON Output only Added picture of module in pg 2 ADC converter corrected pin number on EVK2 was 17 has to be 19 As Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 90 of 90
86. to obtain an analog voltage E Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 64 of 90 Pd e Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 11 1 2 Enabling DAC An AT command is available to use the DAC function The command is AT DAC lt enable gt lt value gt value scale factor of the integrated output voltage 0 1023 10 bit precision it must be present if lt enable gt 1 Refer to SW user guide or to GE863 GPS AT commands specification for the full description of this function NOTE The DAC frequency is selected internally D A converter must not be used during POWERSAVING 11 1 3 Low Pass Filter Example R1 R2 R3 P1 AAA AAA AAA P3 12k 12k 12k INPUT dac out OUTPUT C1 100nF C2 100nF C3 L 100nF P2 P4 GND GND V GND GND GND Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 65 of 90 Z Telit GE863 GPS Hardware User Guide 1vv0300714 Rev 4 20 09 06 11 2 ADC Converter 11 2 1 Description The GE863 GPS module provides a Analog to Digital Converter The input line named ADC IN1 is available on BGA Ball 23 of the GE863 GPS module and on pin 19 of PL104 on EVK2 Board CS1151 The on board A D is 11 bit converter It is able to read a voltage level in the range of 0 2 volts applied on the ADC pin input store
87. two audio input output paths The only items you have to provide are 1 a personal computer or microcontroller 2 a SIM card with a valid Network subscription 3 the audio accessories 4 a knowledge of AT commands programming 5 a power supply The connection between the EVK2 and your PC or other DTE are realized by standard RS232 or USB 1 1 ports The communications between your application and Telit Modules are realized connecting the Asynchronous Serial Interfaces of the module s Base Band Chips ASCO and ASC through 3 a double stacked standard DB9 connector that provides 2 serial communication paths RS232 protocol up to 115Kbit sec 3 a CMOS HUB that makes both serial interfaces accessible through one physical connection providing two way communication in compliance with USB version 1 1 specification The second one is the only possibility with portable personal computers that generally have not the RS232 port Furthermore the EVK2 allows to benefit of the special features of the new Telit Module versions with PYTHON Script Interpreter and GPS satellite positioning receiver z Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 56 of 90 The ASC1 port is used for Z Telit GE863 GPS Hardware User Guide 1vv03007 14 Rev 4 20 09 06 Continuous of debug messages of the PYTHON Script Interpreter requires PYTHON version modules Con
88. uency 3dB should be 3500Hz in order to have 1dB at 3kHz The cutoff frequency is given by the formula 1 1 freq _____ Hz 2x R6044C637 27 R606 C636 TIP example of calculation Let s assume you have a microphone with a sensitivity of 45 dBV my Pa and you want to use it in 1st differential microphone path Mic MT inputs in normal spoken conditions at acoustic pressure of 4 7dBPa As reported at page 33 the electrical level output from the microphone will be MicLevel 45 4 7 49 7 dByrms corresponding to MicVoltage 10 1 7212339410 Vs When the talker is screaming we will have a signal of 330 mVms on the Mic MT inputs due to a 20dB higher Mic Level see TIP 1 with a buffer gain Ga G 20 log AmplifierOutput MicVoltage 20 log 330 10 33 10 3 20 log 10 20dB The corresponding values for the resistors on the buffer could be if we keep the input resistance 10kQ R604 R606 gain R607 gain R605 10 15 150 kQ The commercial values of 150k0 amp 15kQ are then chosen As a consequence the values of the capacitors C636 and C637 shall be C636 C637 1 21r 4000 R606 265 10 F A commercial value of 270pF gives a cutoff frequency of 3931Hz with an errorless than 1 896 Reproduction forbidden without Telit Communications S p A written authorization All Right reserved page 46 of 90 Z Telit GE863 GPS Hardware User Guide 1vv03
89. uirements of the R amp TTE Directive Articles 3 1 a and b safety and EMC respectively and any relevant Article 3 3 requirements The GE863 GPS module is conform with the following European Union Directives e R amp TTE Directive 1999 5 EC Radio Equipment amp Telecommunications Terminal Equipments e Low Voltage Directive 73 23 EEC and product safety e Directive 89 336 EEC for conformity for EMC In order to satisfy the essential requisite of the R amp TTE 99 5 EC directive the GE863 GPS module is compliant with the following standards e GSM Radio Spectrum Standard EN 301 511 and 3GPP 51 010 1 e EMC Electromagnetic Compatibility Standards EN 301 489 1 and EN 301 489 7 e LVD Low Voltage Directive Standards EN 60 950 In this document and the Hardware User Guide Software User Guide all the information you may need for developing a product meeting the R amp TTE Directive is included The GE863 GPS module is conform with the following US Directives e Use of RF Spectrum Standards FCC 47 Part 24 GSM 1900 e EMC Electromagnetic Compatibility Standards FCC47 Part 15 To meet the FCC s RF exposure rules and regulations The system antenna s used for this transmitter must be installed to provide a separation distance of at least 20 cm from all the persons and must not be co located or operating in conjunction with any other antenna or transmitter The system antenna s used for this module must not exceed 3 dBi for mobil

1vv0300714_GE863

Contents

Download Pdf Manuals

Related Search

Related Contents