Home

GE910 Hardware User Guide

image

Contents

1. SECTION C C 5 8 T T DRAF L y 5 or 5 y Ta g 3 zi m or 00721 1 491 9 0 Gon Eye pow We Tener RTT TIR GOTH EN WOT VTL SEIL RNA VOIR TRIB TO BORD 00 PHI e Pe GRAVI a x Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 80 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 NOTE Use an empty tray as cover modules x20 Bo Tray x6 TOTAL 100 Modules Shielding 8 ESD envelope x2 UPPER SIDE Silica gel bag x2 LOWER SIDE 7 di Reproduction forbidden without Telit Communications S p A written authorizati weal on All Rights Reserved page 81 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 14 3 Moisture sensibility The level of moisture sensibility of the Product 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 the Product inside of the dry bag must be 12 months from the bag seal date when stored in a non condensing
2. Current Waveform Current A sn 764 452m 606 370m 448 288m 290 205m 132 123m 25 959m D 00s 10 00ms 19 99ms 29 99ms 39 99ms 49 98ms 59 98ms Time Calculated Measurements 64103Hz sample rate Dc177 1700m Rms 299 8590mA Y1177 6604m Low 34 7802m4 Min 19 2070mA Y2 1 4838 High 861 7810mA Max 679 5190mA dy 1 3061 DCS1800 GPRS Call Power level 0 1 Slot TX Current Waveform Current A dis 739 414m 584 642m 429 869m 275 096m 120 324m 34 440m 0 00s 10 00ms 19 09ms 29 99ms 39 00ms 409 98ms 59 98ms Time Calculated Measurements 64103Hz sample rate Dc160 0650mA Rms 287 8460mA YT 160 0650m Low 22 0351mA Min 9 7719mA Y2 852 4848m High 846 7840mA Max 852 0720m dv 692 4199m Rupreduetion forbidden without Telit Communications S p A written authorization All Rights Reserved o Telit GE910 Hardware User Guide Rev 14 2014 05 06 page 31 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 PCS1900 GPRS Call Power level 0 2 Slot TX 3 Slot RX Current Wavetorm siling UA 25934m 765 605m i i d HH HSH HM 605 277m 444 949m 284 620m 124 292m 36 036m D DDs 10 00ms 19 99ms 29 99ms 39 99ms 49 98ms 59 98ms Time Calculated Measurements 64103Hz sample rate Dc 274 4900mA Rms 412 9800mA YI 274 5464m Low 163 0430mA Min 9 7719mA Y 882 7347m H
3. Mode Average mA 3 8V Mode description Switched BEMTGNSS SWITCHER E A Module supplied but Switched Off GSM mode only IDLE mode AT CFUN 1 28 Normal mode full functionality of the module AT CFUN 4 28 Disabled TX and RX module is not registered on the network 3 8 Paging Multiframe 2 AT CFUN 0 or 5 2 5 Paging Multiframe 3 2 4 Paging Multiframe 4 1 8 Paging Multiframe 9 VOICE TX and RX mode GSM900 VOICE PL5 230 GSM VOICE CALL DCS1800 VOICE PLO 175 GPRS class 1 1TX 1RX GSM900 PL5 225 GPRS Sending data mode DCS1800 PLO 160 GPRS class 10 2TX 3RX GSM900 PL5 360 GPRS Sending data mode DCS1800 PLO 290 GNSS mode only Tracking GPS 3S Tracking GNSS 65 Acquisition GNSS 98 page 27 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 The GE910 QUAD V3 power consumptions are GE910 QUAD V3 Mode Average mA 3 8V Mode description Switched o OER 100uA Module supplied but Switched Off IDLE mode AT CFUN 1 9 Normal mode full functionality of the module AT CFUN 4 9 Disabled TX and RX module is not registered on the network od Paging Multiframe 2 AT CFUN 0 or 5 IS Paging Multiframe 3 1 3 Paging Multiframe 4 0 8 Paging Multiframe 9 CSD TX and RX mode GSM900 CSD PL5 200 GSM VOICE CALL DCS1800 CSD PLO 150 GPRS class 1 1TX 1RX GSM900 PLS 200 GPRS Sending data mode DCS1800 PLO 140 G
4. CNT VBATT PA un G G G EE M apo oD e o k m e am EO GND 1 2 NI N2 P1 E1 G1 HI Jl L1 E2 F2 G2 H2 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 13 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Ground Power EN o o o o Du e DS aa E mj o e ew De e emm Lom EL DES DS emm orm y m Go me EE ome E Ground EN 2 9 E m e DS o G o DE ao e few Ew em Ge a DE 9 EEN O A Hana AI CCA ew e om EE 3 o 9 a a Dm ew DS IO CT Em em aa E ao me Bp ao X me E ew DES e m CU ew DS Ge DN bm ao a fees Ems ew EE 9m O E Im ew DE m Pa EE Eme ew E Ga a meme 1 A A pa mew ES xem O EE m eseve EN sevo A S Em Tua eso Fer sevo meo SE eseve EN an o Fe saen eso EL IET EN emen O Dm _reserveo ME reserved as _reservep reserve ECL Ca esee esee LE Dx esee EN IN ST O E Du aaa PS Ml ro cei Reproduction forbidden without Telit Communications
5. vr DRE o OE e 3 A1 e e 21 e B1 vv y To other Channels NOTE OE connected to VAUX pin may be a useful solution to avoid Back Powering by means of disabling the bus not to supply a voltage level while modem is OFF fi Fao Wp Hae Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 54 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 The signals of the GE910 Serial Port are RS232 Signal GE910 Name Usage Pin Pad Number Number the carrier presence Ta nd Output transmit line of GE910 UART LG ue LORI sse cui Input receive of the GE910 UART DTR dtr uart Data Terminal Ready HM the DR dru P14 Bp Output from the GE910 that indicates the module is ready RTS ris uart omo Sad Input to the GE910 that controls the Hardware flow control CTS cts uart Tero ent Output from the GE910 that controls the Hardware flow control RI HUN R14 Ring Indicator Output from the GE910 that indicates the incoming call condition NOTE According to V 24 RX TX signal names are referred to the application side therefore on the GE910 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 GE910 serial port and vice versa for RX NOTE For a minimum implementation only the TXD and RXD lines can be connected the other lines can be
6. 2 7050 NI 2 0 6 0 0 0 0 6 eo P 32 0 0 1 _ Direction page 77 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 14 1 2 Reel Detail 0 9330098 D 3 0 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 78 of 89 Z e EM ON GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 14 1 3 Packaging Detail M Device amp Packaging label Shielding amp ESD envelope UPPER SIDE Reel label 7 D en without Telit Communications S p A written authorization All Rights Reserved page 79 of 89 Reproduction forbidd lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 14 2 Packing on tray The GE910 modules are packaged on trays of 20 pieces each These trays can be used in SMT processes for pick amp place handling 0A 4 2 1 SECTION A A 1vv0700591 E 6 6 SCALE 4 1
7. Do not use any pull up resistor on the HW_SHUTDOWN line or any totem pole digital output Using pull up resistor may bring to latch up problems on the GE910 power regulator and improper functioning of the module The line HW SHUTDOWN must be connected only in open collector configuration since it is already internally pull up to VBATT TIP The unconditional hardware shutdown must always be implemented on the boards and the software must use it as an emergency exit procedure A simple circuit to do it is Hw SHUTDOWN R1 HW SHUTDOWN 10K Q1 5 BC847BW 0402 SOT 323 3 5 Y OY LI 02s GND impulse i E 4 22 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 24 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 In the following flow chart is detailed the proper HW restart procedure Delay 200ms HW SHUTDOWN HIGH o i Y NOTE In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE910 when the module is powered off or during an ON OFF transition 15 Cond Reproduction forbidden niho Telit Communications S p A written authorization All Rights d page 25 of 89 S L Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 26 of 89 lelit GE910 Hardware Use
8. O w s ez H E E ae a E E RE z wg Y o si m i zg Eye Hs St ie 5o 535 ag gs d z3 pagk 8 E 3 25 s5 SE ae TO y 2 ng SE ae SE EEN 22 s 53 23 2f Eu Bici 23 Es EZ E BS g S iE Sis Sip B gus 33 iu RES gs pi DS e NG Fi 2 1 55 i 83 SS FE z o 1 as TA TIN TINT WwW EE Ol a 1 WT 3 o if of 8 fa A 3 i 2 L 3 8 2 H F O1 T T 8 la a ew LA 5 Le 3 A1 i i 8 j 3 m f i 5 Y Hot EH L a ui z AA T T gt E al EE Pope A dn i 4 aa e a 1 mn s s RI see L L HAN HA NAG 2 5 fr A e A a L d I T m z lt iil 2 Lu L eo m b2 as BB PIL be 1 lil j i i T gt a Lo NG H 5 i A sz o l a z5 ER 3 as 55 P La i z 33 E FS Bina T Max 65 C
9. ANTENNA GNSS 47nH 3v 22pF GNSS_LNA_EN d el D Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 51 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 8 Logic Level Specifications Where not specifically stated all digital interface circuits work at 1 8V CMOS logic levels The following table shows the logic level specifications used in the GE910 interface circuits Absolute Maximum Ratings Not Functional Input level on any digital pin 0 3V 2 1V CMOS 1 8 when ON Operating Range Interface levels 1 8V CMOS Current characteristics Level Output Current baga TR ations S p A written authorization All Rights Reserved page 52 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 9 USB Port The GE910 includes one integrated universal serial bus USB transceiver USB 2 0 FS Note NOT supported on GE910 QUAD V3 9 1 USB 2 0 FS This port is compliant with the USB 2 0 FS Full Speed specifications The following table is listing the available signals PAD Signal UO Function Type COMMENT Pais use ns uo TE OO O O O Kar iso fio item av Power sense for USB presence Accepted range 1 8V to 5V The USB_DPLUS and USB_DMINUS signals have a clock rate of 12 MHz The signal traces should be routed carefully Trace lengths number of vias and capacitive loadi
10. The Electret microphone is internally amplified by a J FET transistor thus the sound is carried out as saturation drain current this means that the Norton equivalence has to be considered The signal is converted to voltage on the 2 2K Ohm resistance from there on circuitry has to be routed in order to not pick up common mode noise beware of the return path ground 5 25 a VL j EC Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 63 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 11 2 4 2 Output Lines EAR Line out Output Differential line coupling a DCT output load resistance output load resistance resistance gt BSQ Q signal bandwidth a 3400Hz 3dB with default filter max differential output voltage 1120mV 3 14dBm0 differential output voltage 550mV ms DOABMO in default condition AT CLVL 10 AT HFRECG 0 TIP We suggest driving the load differentially this kills all the common mode noises click and pop for example the output swing will double 6dB and the big output coupling capacitor will be avoided However if particular OEM application needs also a Single Ended S E circuitry can be implemented The OEM circuitry shall be designed to reduce the common mode noise typically generated by the return path of the big currents In order to get the maximum power output from the device t
11. A AR 53 9 1 USB2 OS a AA ME 53 10 Serial Ports A 54 10 1 Modem Serial Port ds 54 10 2 RS232 level translation 56 11 Audio Section OvervieW 58 11 1 Digital Voice Interface DVI enne enne enne EREE la ade AE trennen nre n nn nn rennen enne nnns 58 11 1 1 DVI Electrical Connections sisi 58 VND Analog AA ecectevicouse aes 58 ibed TOP Tem 58 11 2 2 DOES M 60 11 2 3 EAR CONMCCHON A LA E Apn oh ease site 61 112 45 Electrical Characters aie ad eed io re n E E A DR nds E re t e EE CHR S 63 12 General AU a rie 65 12 1 Using a GPIO Pad as INPUT iecore teen tene diet ERE CUR CH re dette terne entente entendent entiers 66 12 2 UsmgaGPIO Pad as OUTPUT eiie NGABA A e t eere ser ING test de ee eee Ese KORAN 66 12 3 Indication of network service availability seen 67 12 4 Using the TX DISABLE Transmission Control GPIOA sisi 68 12 5 Using the RFTXMON Output GPIOS senais irese in Esnea EEEa REE AEEA RSEN EREE EREE rennen nes 68 12 6 Using the Alarm Output GPIO6 dieser trennen nitet ERE rre NANA 68 12 7 Using the Buzzer Output GPIO7 Available on GE910 QUAD V3 ire 69 128 RIC Bypass OU CEDE 70 12 9 External
12. S p A written authorization All Rights Reserved page 14 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 RESERVED RESERVED Fer see ce EE RESERVED RESERVED TM esee se E DT mone a D ICON HE reserve Com pe a EG we reservo Oso OO pan meme JJ reso O Tm ES Reeve EIA I reserves s O Pw CS mem 0 E RESERVED RESERVED mp reme ES Res J ms reserva ES Reeve I ws eseve O esa Tana esa Em reservo ES meme LLL fms sevo ES eso S Das seven ES EP Ta seven ES EP Ems Tana SSP SSS Par reserves seo O reserves seo O reservo ES seo EL reserves ES ES as eseve ES reserved S Car museo ES reserve O o Para reservan ES EE maa TIO ST e reserves reserve I Ems reservo ES seo LLL ns sevo ES esee SSS S Dm reserves seo EL maa AA Dus sevo ES esee E usa LLL TA eei A WARNING Reserved pins must not be connected Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 15 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 32 Important Pin out to Debug in customer s application The followings pins are necessary to debug the application when the module is assembled on cu
13. SIM Holder Implementation ss 70 12 10 ADC CONVENT ues gers dile 70 124101 DESCFIDOON E GB Ana E E AEE AA ada Pa 70 12 10 2 Using ADC Converter essent nennen esee oke eene tree tree tret RR RRE 70 13 Mounting the GE910 on your Board eee eee sees eee ee etes eee DE EU DO seen ness netus sens netos seins toss ense toss ens s etna e ena 71 13 1 uci MED EE ii 71 13 2 Module finishing amp dimensions ses 71 13 3 Recommended foot print for the application ses 72 134 Sl a 73 13 5 POB pad desiti it AA A AAA NANA A 73 13 6 Recommendations for PCB pad dimensions sise 73 13 7 Solder DAS a NA A A 75 13 7 1 GEOTO Solder vefloW aid rase o ee eet DURO dde oreet duced oil nie adde pe 75 14 Packing system m 77 14 1 Packmg on Reel eee tice neri ince een p c oe i a E EE c e eer e eee 77 14 1 1 Carrier Tape Detail die ea e poete bu Ka pd Javea tags Sb b n Yee Y Ee e Lunes tes 77 14 1 2 R el Detail isse eter dc 78 14 1 3 Packaging Detail iso A Ee rU BERE FN C ia PERTH a 79 14 2 Packing on tray eie tieni arr ies dos e eee e ded dbs IEEE e EC Lr ER Ee EE E EE CERES ER ns 80 14 3 Moisture sensible e e E EE PEE CR e ER En GAN ANA HR ee dns 82 EV Reproduction forbidden without Telit Communications S p A written authorization All Rights o page 6 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 20
14. Standalone These two operating modes are mutually exclusive The circuital configurations required by the two configurations are shown in the following sections page 44 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 7 2 1 GSM Controlled Mode In GSM Controlled Mode the GNSS receiver is controlled by the GSM side of the system through specific AT commands refer to the Telit AT Commands Reference Guide The ATSGPSD 4 command must be issued default configuration for the GE910 GNSS to operate in this specific mode Once the system has been configured in GSM Controlled Mode the GNSS receiver can be turned on by simply issuing the AT GPSP 1 command While in GSM Controlled Mode the NMEA stream can be retrieved through the AT interface or an external USB physical port of the GE910 GNSS refer to the latest version of the Telit GE910 Family Ports Arrangements GNSS GNSS EN GNSS NMEA TX GNSS_NMEA_RX Customer Host USB1 USB2 UART1 Required Circuital Connection m Optional Circuital Connection NOTE The default GNSS UART3 GNSS NMEA TX GNSS NMEA RX serial configuration is as follows NMEA 115200 bps 8 data bits no parity and 1stop bit A WARNING The GNSS_EN pin should be left floating while in GSM Controlled Mode The GNSS NMEA TX GNSS BOOT pin must be left floating during a GNSS firmware upgrade j F E MS A Reproduction forbidden without Teli
15. atmospheric environment of 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 must be 168 hours if condition b IPC JEDEC J STD 033A paragraph 5 2 is respected d Baking is required if conditions b or c are not respected e Baking is required if the humidity indicator inside the bag indicates 1096 RH or more Reproduction forbiddeniwithOuk Telit Communications S p A written authorization All Rights mS page 82 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 15 Conformity Assessment Issues European Union Directive 1999 5 EC The GE910 modules have been evaluated against the essential requirements of the 1999 5 EC Directive Bulgarian C Hacroamerto Telit Communications S p A rnekrapupa ue Quad Band GSM GPRS module OTTOBAPA H CbIIeCTBeHHTEe H3HCKBaHH3 M IPYTHTE IIpHJIOXXHMH M3MCKBAHMA Ha IupekruBa 1999 5 EC Czech Telit Communications S p A t mto prohla uje Ze tento Quad Band GSM GPRS module je ve shod se z kladn mi po adavky a dal mi p slu n mi ustanoven mi sm rnice 1999 5 ES Danish Undertegnede Telit Communications S p A erkl rer herved at f lgende udstyr Quad Band GSM GPRS module overholder de v sentlige krav og vrige relevante krav i direktiv 1999 5 EF Dutch Hierbij verklaart Telit Communications S p A
16. dat het toestel Quad Band GSM GPRS module in overeenstemming is met de essenti le eisen en de andere relevante bepalingen van richtlijn 1999 5 EG English Hereby Telit Communications S p A declares that this Quad Band GSM GPRS module is in compliance with the essential requirements and other relevant provisions of Directive 1999 5 EC Estonian K esolevaga kinnitab Telit Communications S p A seadme Quad Band GSM GPRS module vastavust direktiivi 1999 5 EU pohinduetele ja nimetatud direktiivist tulenevatele teistele asjakohastele s tetele German Hiermit erkl rt Telit Communications S p A dass sich das Ger t Quad Band GSM GPRS module in bereinstimmung mit den grundlegenden Anforderungen und den brigen einschl gigen Bestimmungen der Richtlinie 1999 5 EG befindet Greek ME THN IIAPOYZA Telit Communications S p A AHAQNEI OTI Quad Band GSM GPRS module SYMMOP QONETAI IIPOX TIZ OYZIQAEIZ AIIAITHXEIX KAI T AOIIIEX XXETIKEX AIATASEIX THX OAHI TAX 1999 5 EK Hungarian Alulirott Telit Communications S p A nyilatkozom hogy a Quad Band GSM GPRS module megfelel a vonatkoz alapvet k vetelm nyeknek s az 1999 5 EC ir nyelv egy b eldirasainak Finnish Telit Communications S p A vakuuttaa t ten ett Quad Band GSM GPRS module tyyppinen laite on direktiivin 1999 5 EY oleellisten vaatimusten ja sit koskevien direktiivin muiden ehtojen mukainen French Par la pr sente Telit Communications S p A d clare que l appareil Quad Band GS
17. guide as helpful as possible Keep us informed of your comments and suggestions for improvements Telit appreciates feedback from the users of our information Reproduction forbidd i page 8 of 89 1 4 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Document Organization This document contains the following chapters Chapter 1 Introduction provides a scope for this document target audience contact and support information and text conventions Chapter 2 Overview provides an overview of the document Chapter 3 GE910 Module Connections deals with the pin out configuration and layout Chapter 4 Hardware Commands How to operate on the module via hardware Chapter 5 Power supply Power supply requirements and general design rules Chapter 6 GSM Radio The antenna connection and board layout design are the most important parts in the full product design Chapter 7 GNSS Receiver This section describes the GNSS receiver Chapter 8 Logic Level specifications Specific values adopted in the implementation of logic levels for this module Chapter 9 USB Port Describes the USB port and the interface between the module and OEM hardware Chapter 10 Serial ports Describes the UART ports present and the interface between the module and OEM hardware Chapter 11 Audio Section overview Refers to the audio blocks of the Base Band Chip of the
18. kept separate from noise sensitive lines such as microphone earphone cables page 37 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 6 GSM Radio Section The antenna connection and board layout design are the most important aspect in the full product design as they strongly affect the product overall performances hence read carefully and follow the requirements and the guidelines for a proper design 6 1 GSM Antenna Requirements As suggested on the Product Description the antenna and antenna transmission line on PCB for a Telit GE910 device shall fulfill the following requirements ANTENNA REQUIREMENTS Depending by frequency band s provided by the network operator the customer shall use the most suitable antenna for that those band s 70 MHz in GSM850 80 MHz in GSM900 170 MHz in DCS amp 140 MHz PCS band When using the GE910 since there s no antenna connector on the module the antenna must be connected to the GE910 antenna pad LGA pad K1 by means of a transmission line implemented on the PCB In the case the antenna is not directly connected at the antenna pad of the GE910 then a PCB line is needed in order to connect with it or with its connector This transmission line shall fulfill the following requirements ANTENNA LINE ON PCB REQUIREMENTS Characteristic Impedance 0 3 dB Coupling with other signals shall be avoided Cold End Ground Plane of antenna shall be equipotential t
19. left open provided a software flow control is implemented NOTE DTR pin should be disconnected before activating the Power Saving Mode NOTE In order to avoid a back powering effect it is recommended to avoid having HIGH logic level signal applied to digital pins of the module when powered off or during an ON OFF transition Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 55 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 10 2 RS232 level translation In order to interface the GE910 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 1 8V 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 a lower voltage multiplying ratio on the level translator Note that the negative signal voltage must be less than 0V 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 drivers and receivers 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
20. 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 ec europa eu enterprise sectors rtte documents The text of the Directive 99 05 regarding telecommunication equipments is available while the applicable Directives Low Voltage and EMC are available at http ec europa eu enterprise sectors electrical LG Reproduction forbidden with
21. oim 0 to 1 2V on GE910 PER AD V3 DIGITAL IO cs GPIO 01 el eem GPIO 01 STAT LED 1 8V O Function STATUS LED Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 12 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 GPIO 02 GPIO 02 CMOS 1 8V CORRE aos CIN AN Ci GPIO 04 SE GPIO 04 TX DISABLE CMOS 1 8V E GPIO 06 a GPIO 06 ALARM CMOS18V 1 8V Alternate Function ALARM Function ALARM Available on GE910 QUAD V3 me oa El mom Eos GPIO 09 GPIO 09 RF SECTION GSM AO A aaa a awenas TEC lo ANTENNA GNSS GNSS Antenna 50 ohm Reserved on GE910 QU Open Colector active low Ed GNSS_EN El External GNSS ON OFF VBATT ref Reserved on GE910 QUAD V3 UART3 or GNSS_BOOT EN GNSS NMEA TX a UART NMEA Output E UA UART3 GNSS_NMEA_RX UART NMEA Input Reserved on GE910 QU Active Antenna Control MISCELLANEOUS FUNCTIONS E HW_SHUTDOWN HW Unconditional Shutdown VBATT ref Open Colector active low ON_OFF Input command for power ON VRTC 2 3V ref Open Colector active low Backup for the embedded RTC E VRTC n VRTC Backup capacitor RTC Power supply don t connect to VBATT Supply Output for external accessories Power o MER G eme POWER SUPPLY SUPPLY BE me BE ET Tee EE si eve pps at re fd in ep di Pay one OOOO JO inner ado Pay Tone O Manpower supiy Radona Po DE orm a oe a o Er zx Ea y S EI He
22. or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Labelling Requirements for the Host device The host device shall be properly labelled to identify the modules within the host device The certification label of the module shall be clearly visible at all times when installed in the host device otherwise the host device must be labelled to display the FCC ID and IC of the module preceded by the words Contains transmitter module or the word Contains or similar wording expressing the same meaning as follows Product FCC ID IC GE910 QUAD RI7GE910 5131A GE910 GE910 GNSS RI7GE910G 5131A GE910 GE910 QUAD V3 RI7GE910Q3 5131A GE910Q3 L appareil h te doit tre tiquet comme il faut pour permettre l identification des modules qui s y trouvent L tiquette de certification du module donn doit tre pos e sur l appareil h te un endroit bien en vue en tout temps En l absence d tiquette l appareil h te doit porter une tiquette donnant le FCC ID et le IC du module pr c d des mots Contient un module d mission du mot Contient ou d une formulation similaire exprimant le m me sens comme suit Product
23. power saving requirements N WARNING Do not use any pull up resistor on the GNSS EN line or any totem pole digital output Using pull up resistor may bring to latch up problems on the GE910 power regulator and improper functioning of the module The line GNSS_EN must be connected only in open collector configuration since it is already internally pull up to VBATT The GNSS NMEA TX GNSS BOOT pin must be tied to GROUND through a 1K pull up resistor before starting a GNSS firmware upgrade Reproduction forbiddeniwithOuk Telit Communications S p A written authorization All Rights mS page 47 of 89 7 3 7 3 1 7 3 2 7 3 3 Telit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 RF Front End Design The GE910 Module contains an integrated LNA and pre select SAW filter This allows the module to work properly with a passive GPS antenna If the antenna cannot be located near the GE910 then an active antenna 1 e an antenna with a built in low noise amplifier can be used RF Signal Requirements Thanks to the internal LNA it amplifies the GNSS signals and provides enough gain for the receiver to use a passive antenna A very low noise design is utilized to provide maximum sensitivity For better performance the system requires an external BIAS T and antenna voltage supply for active antenna GNSS Antenna PCB Line Guidelines e Ensure that the antenna line impedance is 500hm e Keep the antenna lin
24. the 0 1 8V UART to the RS232 level The receiver is the translator from the RS232 level to 0 1 8V UART In order to translate the whole set of control lines of the UART you will need e 5 drivers e 3 receivers NOTE The digital input lines working at 1 8V CMOS have an absolute maximum input voltage of 2 1V therefore the level translator IC shall not be powered by the 3 8V supply of the module Instead it must be powered from a 1 8V dedicated power supply ki Fao Wp i Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 56 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 An example of RS232 level adaptation circuitry could be done using a MAXIM transceiver MAX218 In this case the chipset is capable to translate directly from 0 1 8V to the RS232 levels Example done on 4 signals only l 1 8V A I ON OFF MODULE RS232 MODULE RS232 ENABLE DSR RS232 ATS R5232C CTS RS2320 RI AS232 7 DTR AS23 END Reproduction forbidden without Telit Communications S p A written authorization AU Rights Reserved page 57 of 89 11 11 1 11 1 1 11 2 11 2 1 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Audio Section Overview The audio paths are e Digital Voice Interface DVI e Analog Front End Digital Voice Interface DVI DVI Electrical Connections The prod
25. the lead free process This issue should be discussed with the PCB supplier Generally the wettability of tin lead solder paste on the described surface plating is better compared to lead free solder paste d el s Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 74 of 89 13 7 13 7 1 Solder paste Lead free Solder paste Sn Ag Cu lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 We recommend using only no clean solder paste in order to avoid the cleaning of the modules after assembly GE910 Solder reflow Recommended solder reflow profile Temperature Limit Up Limit Down Recommended page 75 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Profile Feature Pb Free Assembly Average ramp up rate TL 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 Temper
26. your Board 13 1 General The GE910 modules have been designed in order to be compliant with a standard lead free SMT process 13 2 Module finishing amp dimensions The GE910 overall dimensions are e Length 28 2 mm e Width 28 2 mm e Thickness 2 25 mm e Weight 3 6g DETAIL A SCALE 8 1 0 8 0 SEE DETAIL A 0 70 05 B Pe a A EN 3 9 o 0 El 3 B is OO 6 oo P B AL Q0 O O e i EA Y Asa Bf Een A E Or O O O O ii S E aM D i O A x E O o 000 1 5 B a i 8 a SECTION B B page 71 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 13 3 Recommended foot print for the application Inhibit Components 28 40 1 90 5 oo et Pg Pd DL agg ui O HOO Lu EE eo E AR TB O E O O oooojo 3 Inhibit Wiring 28 40 oOmuouaauaIauuuuuuds ge O OO AAO BO im Hu gg se rro rE EC EC OE N 0 70 1 80 Y In order to easily rework the GE910 is suggested to consider on the application a 1 5mm Inhibit area around the module It is also suggested as common rule for an SMT component to avoid having a mechanical part of the application in direct contact with the module O NOTE In the customer application the region under INHIBIT WIRING must be clear from signal or ground paths EM
27. 05 06 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 1 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 1 8V CMOS then it can be buffered with an open collector transistor with a 47K pull up to 1 8V NOTE In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE910 when the module is powered off or during an ON OFF transition Using a GPIO Pad as OUTPUT The GPIO pads when used as outputs can drive 1 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 page 66 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 12 3 Indication of network service availability The STAT LED pin status shows information on the network service availability and Call status In the GE910 modules the STAT LED usually needs an external transistor to drive an external LED Therefore the status indicated in the following table is reversed with respect to the pin status LED status Device Status Fast blinking Period 1s Ton 0 5s ees Pu 0 3s Registered full service Net search Not regi
28. 14 05 06 15 Conformity Assessment ISSUS RRRRR ossee 83 16 SAFETY RECOMMANDATIONS sa satus bte ood iasesssusscestoatscsiesesuie KIRA Dee b End dA nantes een 88 17 Document HISTORY AAA ehe ehe Da ARTESA A Da RR Ee ose VEL Ve Eng e nene e ON 89 a x E p Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 7 of 89 1 1 1 2 1 3 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Introduction Scope The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE910 module Audience This document is intended for Telit customers who are integrators about to implement their applications using our GE910 modules Contact Information Support For general contact technical support to report documentation errors and to order manuals contact Telit s Technical Support Centre TTSC at TS EMEA telit com TS NORTHAMERICA telit com TS LATINAMERICA telit com TS APAC telit com Alternatively use http www telit com en products technical support center contact php For detailed information about where you can buy the Telit modules or for recommendations on accessories and components visit http www telit com To register for product news and announcements or for product questions contact Telit s Technical Support Centre TTSC Our aim is to make this
29. 3 7 Global Navigation Satellite System GE910 GNSS eere eee eee esee eU anan senses sens DE nasus etus tasto nono nsan nor noanosanonnos 44 Tila GNSS SignalsPan OUL isse tento A debite A A AAA Aa 44 7 2 GNSS Receiver Control tr NG a te i erret is 44 7 2 1 GSM Controlled Moda as did tadas 45 122 External Host Controlled Mode Standalone essere eene renes 46 7 3 RE Front End Desi eter it tree A b t bi deb RAE E BULAN oiv A E RR A 48 7 3 1 RF Signal ReguiFemehts tas di la td 48 7 3 2 GNSS Antenna PCB Line Guidelines ui REDE hene conan nono noc eter tete nets sere eterne esses serena 48 7 3 3 GNSS Antenna Polarization i ete MAKAKA BELA AK ted eise pte dti tas 46 7 3 4 GNSS Antenna GAIN A ia did 49 7 3 5 Active versus Passive Antenna coconiccccnonononananananononononanonononan anar oran anar nn oran BA DD DA a A ADA e reet reete rete peteret eisi Dadas 49 7 3 6 RE Trace LOSSES iii iia 50 7 3 7 Implications of the Pre select SAW Filter seins 50 EV Reproduction forbidden without Telit Communications S p A written authorization All Rights o page 5 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 7 3 8 External LNA Gain and Noise Figure 3 ip o E eme cy cided ctra pesait 50 7 3 9 Powering the External LNA active antenna 51 7 3 10 External LNA Enable itr rd e el iren e sedi SUN da pauna Lasala 51 8 Logic Level Specifications M 52
30. 4 GHz A AAA KR mW a a rae 1 2 CONT 3 PRm Cor START 800 000 000 MHz STOP 2 000 000 000 MHz ats E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 42 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 6 4 GSM Antenna Installation Guidelines e Install the antenna in a place covered by the GSM signal e Ifthe device antenna is located greater then 20cm from the human body and there are no co located transmitter then the Telit FCC IC approvals can be re used by the end product e If the device antenna is located less than 20cm from the human body or there are no co located transmitter then the additional FCC IC testing may be required for the end product Telit FCC IC approvals cannot be reused e Antenna shall not be installed inside metal cases e Antenna shall be installed also according Antenna manufacturer instructions i el Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 43 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 7 Global Navigation Satellite System GE910 GNSS The GNSS part of GE910 GNSS module is a new age of receiver that can simultaneously search and track satellite signals from multiple satellite constellations This multi GNSS receiver uses the entire spectrum of GNSS systems available GPS Glonass Galileo and QZSS It feat
31. 9 99ms 49 98ms 59 98ms Time Calculated Measurements b4103Hz sample rate Dc 237 7220mA Rms 495 9620mA NT 238 8046m Low 38 9597mA Min 12 7739mA v2 1 4838 High 1 46084 Max 1 48274 dy 1 2450 Reproduci n forbidden without Telit Communications S p A written authorization All Rights Reserved page 29 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 GSM900 GPRS Call Power level 5 1 Slot TX Current Waveform A TE 1 244 980 809m 717 759m 454 710m 191 660m 71 389m 0 00s 10 00ms 19 99ms 29 99ms 39 99ms 49 98ms 59 98ms Time Calculated Measurements B4103Hz sample rate Dc 223 0320m Rms 465 6530mA Y1 223 2308m Low 28 3425m4 Min 3 7677mA v2 1 4360 High 1 41644 Max 1 43534 dv 1 2128 GSM900 GPRS Call Power level 5 2 Slot TX 3 Slot RX Curent Wavetorm Sel A m 1 261 994 053m 727 387m 460 712m i a 194 036m fi hii i NAG Ng V MUA li 72 640m 0 00s 10 00ms 20 00ms 30 00ms 40 00ms 50 00ms 60 00ms Time Calculated Measurements B4103Hz sample rate Dc 402 5160mA Rms 674 0740mA Y1 402 2342 m Low 137 8580mA Min 3 5532mA v2 1 4556 High 1 42084 Max 1 4549A dY 1 0533 DCS1800 Voice Call Power level 0 Ji e Rupreduetion forbidden without Telit Communications S p A written authorization All Rights Reserved page 30 of 89
32. EE EL ER A Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 72 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 13 4 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 5 PCB pad design Non solder mask defined NSMD type is recommended for the solder pads on the PCB Copper Pad Solder Mask SMD NSMD Solder Mask Defined Non Solder Mask Defined 13 6 Recommendations for PCB pad dimensions Units are in mm 3 HA N WV ae 3 12 a A Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 73 of 89 It GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 It is not recommended to place via or micro via not covered by solder resist in an area of 0 3 mm around the pads unless it carries the same signal of the pad itself see following figure 2p a C Inhibit area for micro via Holes in pad are allowed only for blind holes and not for through holes When using the hole in pad we suggest the via filling Recommendations for PCB pad surfaces Layer thickness um No SE 20105 ONG good solder ability protection high shear force values The PCB must be able to resist the higher temperatures which are occurring at
33. FCC ID IC GE910 QUAD RI7GE910 5131A GE910 GE910 GNSS RI7GE910G 5131A GE910 GE910 QUAD V3 RI7GE910Q3 5131A GE910Q3 This Class B digital apparatus complies with Canadian ICES 003 Cet appareil num rique de classe B est conforme la norme canadienne ICES 003 y Reproduction forbidden without Telit Communications S p A written authorization All Rights oh AR page 87 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 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 Q 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 electrostatic discharges
34. GE910 Telit Modules Chapter 12 General Purpose I O How the general purpose I O pads can be configured Chapter 13 Mounting the GE910 on the application board Recommendations and specifics on how to mount the module on the user s board Chapter 14 Packing system Packaging Information Chapter 15 Conformity Assessment Issues Information related to the Conformity Assessments Chapter 16 Safety Recommendations Information related to the Safety topics Chapter 17 Document History page 9 of 89 1 5 ay A 1 6 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Text Conventions Danger This information MUST be followed or catastrophic equipment failure or bodil injury may occur Caution or Warning Alerts the user to important points about integrating the module if these points are not followed the module and end user equipment may fail or malfunction Tip or Information Provides advice and suggestions that may be useful when integrating the module All dates are in ISO 8601 format i e YY Y Y MM DD Related Documents e Telit s GSM GPRS Family Software User Guide 1vv0300784 e Audio settings application note 80000NT10007a e Digital Voice Interface Application Note 80000NT10004a e GE910 Product description 80397ST10107A e SIM Holder Design Guides 80000NT 10001a e AT Commands Reference Guide 80000ST10025a e Telit EVK2 U
35. M GPRS module est conforme aux exigences essentielles et aux autres dispositions pertinentes de la directive 1999 5 CE Icelandic H r me lysir Telit Communications S p A yfir bv ad Quad Band GSM GPRS module er i samremi vi grunnkr fur og a rar kr fur sem ger ar eru i tilskipun 1999 5 EC Italian Con la presente Telit Communications S p A dichiara che questo Quad Band GSM GPRS module conforme ai requisiti essenziali ed alle altre disposizioni pertinenti stabilite dalla direttiva 1999 5 CE Latvian Ar So Telit Communications S p A deklare ka Quad Band GSM GPRS module atbilst Direktivas 1999 5 EK b tiskajam prasibam un citiem ar to saistitajiem noteikumiem page 83 of 89 Telit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Lithuanian Siuo Telit Communications S p A deklaruoja kad Sis Quad Band GSM GPRS module atitinka esminius reikalavimus ir kitas 1999 5 EB Direktyvos nuostatas Maltese Hawnhekk Telit Communications S p A jiddikjara li dan Quad Band GSM GPRS module jikkonforma mal htigijiet essenzjali u ma provvedimenti ohrajn relevanti li hemm fid Dirrettiva 1999 5 EC Norwegian Telit Communications S p A erkl rer herved at utstyret Quad Band GSM GPRS module er i samsvar med de grunnleggende krav og vrige relevante krav i direktiv 1999 5 EF Polish Niniejszym Telit Communications S p A o wiadcza ze Quad Band GSM GPRS module jest zgodny z zasadniczymi wymogami
36. PRS class 10 2TX 3RX GSM900 PL5 300 GPRS Sending data mode DCS1800 PLO 250 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 and 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 NOTE 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 page 28 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 52 1 Power consumption Plots This document section is showing the typical Current consumption plots using Agilent 66319D in the normal working conditions of the module GSM900 Voice Call Power level 5 Current Waveform A 556 1 286 1 016 745 910m 475 807m 205 704m 64 398m 0 00s 10 00ms 19 99ms 29 99ms 3
37. PS receiver In the case of really weak signals a good antenna could make the difference between being able to use a particular satellite signal or not Active versus Passive Antenna If the GPS antenna is placed near the GE910 and the RF traces losses are not excessive nominally 1 dB then a passive antenna can be used This would normally be the lowest cost option and most of the time the simplest to use However if the antenna needs to be located page 49 of 89 7 3 6 13 7 3 8 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 away from the GE910 then an active antenna may be required to obtain the best system performance The active antenna has its own built in low noise amplifier to overcome RF trace or cable losses after the active antenna However an active antenna has a low noise amplifier LNA with associated gain and noise figure In addition many active antennas have a pre select filter a post select filter or both RF Trace Losses RF Trace losses are difficult to estimate on a PCB without having the appropriate tables or RF simulation software to estimate what the losses would be A good rule of thumb would be to keep the RF traces as short as possible make sure they are 50 ohms impedance and don t contain any sharp bends Implications of the Pre select SAW Filter The module GE910 GNSS contains a SAW filter used in a pre select configuration with the built in LNA that is the RF input o
38. S e leli wireless solutions GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 hl Wes H a u Eat d i Biga ic Ims a M b naa a ipa n Nah Making machines talk lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 APPLICABILITY TABLE PRODUCT Im ma Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 2 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE Notice While reasonable efforts have been made to assure the accuracy of this document Telit assumes no liability resulting from any inaccuracies or omissions in this document or from use of the information obtained herein The information in this document has been carefully checked and is believed to be entirely reliable However no responsibility is assumed for inaccuracies or omissions Telit reserves the right to make changes to any products described herein and reserves the right to revise this document and to make changes from time to time in content hereof with no obligation to notify any person of revisions or changes Telit does not assume any liability arising out of the application or use of any product software or circuit described herein neither does it convey license under its patent rights or the rights of others It is possible that this
39. a will have 3 dB losses as compared to an RHCP antenna assuming the same antenna gain specified in dBi and dBic respectively An RHCP antenna is better at rejecting multipath than a linearly polarized antenna page 48 of 89 7 3 4 7 3 5 Telit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 This is because the reflected signal changes polarization to LHCP which would be rejected by the RHCP antenna by typically 20 dB or so If the multipath signal is attenuating the line of sight signal then the RHCP antenna would show a higher signal level than a linearly polarized antenna because the interfering signal is rejected However in the case where the multipath signal is replacing the line of sight signal such as in an urban canyon environment then the number of satellites in view could drop below the needed number to determine a 3D solution This is a case where a bad signal may be better than no signal The system designer needs to make tradeoffs in his application to choose the better solution GNSS Antenna Gain Antenna gain is defined as the extra signal power from the antenna as compared to a theoretical isotropic antenna equally sensitive in all directions For example a 25x25mm patch antenna on a reference ground plane usually 70x70mm will give an antenna gain at zenith of 5 dBic A smaller 18mm by 18mm square patch on a reference ground plane usually 50x50mm will give an antenna gain at zenith of 2
40. apacitor 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 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 GE910 from power polarity inversion Otherwise the battery connector should be done in a way to avoid polarity inversions when connecting the battery e 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 page 35 of 89 5 3 2 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 36 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Thermal Design Guidelines The thermal design for the power supply heat sink should be done with the following specifications See section 6 2 Power Consumption 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 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 For the heat generated by the GE910 you can consider it
41. ature 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 ttp 8 minutes max NOTE All temperatures refer to topside of the package measured on the package body surface 4 WARNING The GE910 module withstands one reflow process only Reproduction forbidden without Telit Communications S p A written authorization All Rights o page 76 of 89 14 14 1 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Packing system Is possible to order in two packaging system e Package on reel e Package on tray Packing on Reel The GE910 can be packaged on reels of 200 pieces each See figure for module positioning into the carrier xE910 module DIRECTION OF UNREELING Reel Carrier Tape Cover Tape 00000000 00000000000000000 NOT Rounded 14 1 1 Carrier Tape Detail e EIA DIMENSIONS 264020 PLU gt 3 W 44022 gt i o E 175 na e 0 4 0 05 as DS F 20255 O O 0000000 0 O 9 9 0 9 9 9 99 9 6 9 0 p 32 0 27 P 4 00 55 P 2 00 510 D 1 50 25 D 0 00 7 T 040 e Al As 28 6 F A B 28 6 x Ko
42. authority to operate the equipment Telit n approuve aucune modification apport e l appareil par l utilisateur quelle qu en soit la nature Tout changement ou modification peuvent annuler le droit d utilisation de l appareil par l utilisateur Interference statement This device complies with Part 15 of the FCC Rules and Industry Canada licence exempt RSS standard s Operation is subject to the following two conditions 1 this device may not cause interference and 2 this device must accept any interference including interference that may cause undesired operation of the device Le pr sent appareil est conforme aux CNR d Industrie Canada applicables aux appareils radio exempts de licence L exploitation est autoris e aux deux conditions suivantes 1 l appareil ne doit pas produire de brouillage et 2 l utilisateur de l appareil doit accepter tout brouillage radio lectrique subi m me si le brouillage est susceptible d en compromettre le fonctionnement Wireless notice This equipment complies with FCC and IC radiation exposure limits set forth for an uncontrolled environment The antenna should be installed and operated with minimum distance of 20 cm between the radiator and your body Antenna gain must be below Frequency band Antenna gain GSM 850 6 43 dBi PCS 1900 2 75 dBi This transmitter must not be co located or operating in conjunction with any other antenna or transmitter Cet appareil est conf
43. authorization All Rights page 69 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 12 8 RTC Bypass out The VRTC pin brings out the Real Time Clock supply which is separate from the rest of the digital part allowing having only RTC going on when all the other parts of the device are off To this power output a backup capacitor can be added in order to increase the RTC autonomy during power off of the battery NO Devices must be powered from this pin If ON OFF signal is connected to GND the RTC autonomy will decrease A WARNING Never connect VRTC pin to VBATT 12 9 External SIM Holder Implementation NOTE Please refer to the related User Guide SIM Holder Design Guides 80000NT10001a 12 10 ADC Converter 12 10 1 Description The on board ADC has 10 bit resolution It is able to read a voltage level in the range of 0 1 3 volts to store and to convert into a 10 bits word Min Input Voltage range 0 13 AD conversion 10 bits Resolution lt 13 The ADC input line is named as ADC INI and it is available on PAD B1 12 10 2 Using ADC Converter AT command to manage the ADC is ATRADC 1 2 The read value is expressed in mV NOTE Refer to SW User Guide or AT Commands Reference Guide for the full description of this function page 70 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 13 Mounting the GE910 on
44. board in order to characterize the losses of the transmission line including the connector itself During Return Loss impedance measurements the transmission line has been terminated to 50 2 load Return Loss plot of line under test is shown below 5 Aug 2011 18 gem 25 CH1 S44 log MAG 10 dB REF O dB 4 44 471 dB La 1 880 000 odo MHz PRm 1 38 413 dB ase u 824 MHz MARKE TI 2 33 839 dB zZ 1 388 GHZ 3 28 764_ dB 1 41 GHz 4 ra y 2 E A 4 START 800 000 000 MHz STOP 2 000 000 000 MHz ges page 41 of 89 Reproduction forbidden without Telit Communications S p A written authorization All Rights mm lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Line input impedance in Smith Chart format once the line has been terminated to 50 2 load is shown in the following figure o Aug 2011 TOTO 37 CH1 S44 4 U FS 4 50 053 o 601 56 mo 132 95 BF 1 990 000 000 MHz Bal PRm 49 391 a cor 1 0645 a MARK 824 MHz 857 a sling 352 a O MHz a a Z START 800 000 000 MHz STOP 2 000 000 000 MHz Insertion Loss of G CPW line plus SMA connector is shown below 5 Aug 2011 16 44 21 CH2 Soy log AG 5 dB REF O dB 4 s1585 dB 1 990 000 09O MHz 17 0613 dB u 834 MHz MARKE 4 21 ogg4 ng Z 4 99 GHz 81 1543 dB 4 4
45. by law No part of the software or documentation may be reproduced transmitted transcribed stored in a retrieval system or translated into any language or computer language in any form or by any means without prior written permission of Telit High Risk Materials Components units or third party products used in the product described herein are NOT fault tolerant and are NOT designed manufactured or intended for use as on line control equipment in the following hazardous environments requiring fail safe controls the operation of Nuclear Facilities Aircraft Navigation or Aircraft Communication Systems Air Traffic Control Life Support or Weapons Systems High Risk Activities Telit and its supplier s specifically disclaim any expressed or implied warranty of fitness for such High Risk Activities Trademarks TELIT and the Stylized T Logo are registered in Trademark Office All other product or service names are the property of their respective owners Copyright O Telit Communications S p A I i a qe p Reproduction forbiddeniwithOuk Telit Communications S p A written authorization All Rights Ha page 4 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Contents E ON 8 1 1 NN AA 8 1 2 A non sas NAN Ak NN A ANT 8 1 3 Contact Information Support sise 8 1 4 Document Organization ERR 9 1 5 Text Conventions ne eor terre begeisterte A E Rer entrate ird tes eee malins 10 1 6 Relat
46. d 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 module controlling micro controller 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 module during sleep periods dramatically reducing the sleep consumption to few UA In battery powered devices this feature will greatly improve the autonomy of the device NOTE During RESET the line is set to HIGH logic level page 68 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 12 7 Using the Buzzer Outp ut GPIO ue on GE910 QUAD V3 The GPIO7 pad when configured as Buzzer Output is controlled by the 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 A sample interface scheme is included below to give you an idea of how to interface a Buzzer to the GPIO7 TR2 buzzer SMBT2907A TR1 BCR141VY 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 Reproduction forbidden without Telit Communications S p A written
47. dBic While an antenna vendor will specify a nominal antenna gain usually at zenith or directly overhead antenna pattern curves should be supplied specifying gain as a function of elevation and gain at a fixed elevation as a function of azimuth Pay careful attention to the requirement to meet these specifications such as required ground plane and any external matching components Failure to follow these requirements could result in very poor antenna performance It is important to note that GPS antenna gain is not the same thing as external LNA gain Most antenna vendors will specify these numbers separately but some combine them into a single number It is important to know both numbers when designing and evaluating the front end of a GPS receiver For example antenna X has an antenna gain of 5 dBiC at azimuth and an LNA gain of 20 dB for a combined total of 25 dB Antenna Y has an antenna gain of 5 dBiC at azimuth and an LNA gain of 30 dB for a combined total of 25 dB However in the system antenna X will outperform antenna Y by about 10 dB refer to next chapter for more details on system noise floor An antenna with higher gain will generally outperform an antenna with lower gain Once the signals are above about 130 dBm for a particular satellite no improvement in performance would be gained However for those satellites that are below about 125 dBm a higher gain antenna would improve the gain and improve the performance of the G
48. ds and then released The same circuitry and timing for the power on must be used The device shuts down after the release of the ON OFF pad TIP To check if the device has been powered off the hardware line PWRMON must be monitored The device is powered off when PWRMON goes low NOTE In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE910 when the module is powered off or during an ON OFF transition Reproduction forbidd i page 22 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 The following flow chart shows the proper HW TURN OFF procedure ON OFF LOW Wait gt 3s Looping for more than 15 s page 23 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 4 3 HW Unconditional Shutdown on GE910 a gt WARNING The hardware unconditional Shutdown must not be used during normal operation of the device since it does not detach the device from the network It shall be kept as an emergency exit procedure to be done in the rare case that the device gets stacked waiting for some network or SIM responses To unconditionally Shutdown the GE910 the pad HW SHUTDOWNY must be tied low for at least 200 milliseconds and then released After this operation the module is in OFF condition The maximum current that can be drained from the HW SHUTDOWN pad is 0 4 mA NOTE
49. e 84 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 The conformity assessment procedure referred to in Article 10 and detailed in Annex IV of Directive 1999 5 EC has been followed with the involvement of the following Notified Body Notified Body ATA wireless S A Parque Tecnologico de Andaluc a C Severo Ochoa 2 29590 Campanillas M laga SPAIN Notified Body No 1909 Thus the following marking is included in the product CE 1909 The full declaration of conformity can be found on the following address http www telit com There is no restriction for the commercialisation of the GE910 modules in all the countries of the European Union Final product integrating this module must be assessed against essential requirements of the 1999 5 EC R amp TTE Directive It should be noted that assessment does not necessarily lead to testing Telit Communications S p A recommends carrying out the following assessments RF spectrum use R amp TTE art 3 2 It will depend on the antenna used on the final product EMC R amp TTE art 3 10 Testing _ Health amp Safety R amp TTE art 3 1a Testing page 85 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 FCC IC Regulatory notices Modification statement Telit has not approved any changes or modifications to this device by the user Any changes or modifications could void the user s
50. e on the PCB as short as possible to reduce the loss e Antenna line must have uniform characteristics constant cross section avoid meanders and abrupt curves e Keep one layer of the PCB used only for the Ground plane if possible e Surround on both the sides over and under the antenna line on PCB with Ground avoid having other signal tracks facing directly the antenna line of 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 Place EM noisy devices as far as possible from antenna line Keep the antenna line far away from power supply lines Keep the antenna line far away from GSM RF lines If you have EM noisy devices around the PCB hosting the module such 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 If you do not have EM noisy devices around the PCB hosting the module use a strip line on the superficial copper layer for the antenna line The line attenuation will be lower than a buried one GNSS Antenna Polarization The GNSS signal as broadcast is a right hand circularly polarized signal The best antenna to receive these signals is a right hand circularly RHCP polarized antenna Remember that IS GPS 200E specifies the received power level with a linearly polarized antenna A linearly polarized antenn
51. ed Docum nlts ii 10 XM ula 11 3 GESTO module connections scie dare none te cessent sense TUE Ve TN Ve EUR ARA ARA 12 3 1 PIN OU A A OR 12 3 2 Important Pin out to Debug in customer s application ss 16 3 3 EGAPADs Layoub BAGANI RG NGABA NGI ANI NB AAAG ana Aa DAA ak 17 4 Hardware ComniatnuS oec NN 18 4 1 Turing ON the GrE9 T0 nement ce ac 18 4 2 Turning OFF the GE910 REM 22 4 3 HW Unconditional Shutdown on GE910 ooooooccnnncccccoconcconononccononcncnonncnonnnnncnnonnnnrcnnnnnnronnnnnon none nrrnnnnnnronnancnnonnnnrnnnns 24 NEN ASNO A A NN 26 5 1 Power Supply Requirements n diia 26 5 2 Power Comsumptiom 4 ades NANNING NIA NANG iii 27 5 2 1 Power consumption Plot undo sd id leere p C Rr Rates Ee RISE DE CHEN RU 29 5 3 General Design Rules 33 5 3 1 Electrical Design Guidelines ed EA ed e eie BATA e PERI EO dis 33 5 3 2 Thermal Design Guidelines escis dressent 36 5 3 3 Power Supply PCB layout Guidelines seen 37 6 LISA A 38 6 1 COUIGIERSSSAAA 38 6 2 GSM Antenna PCB line Guidelines sisi nenne nenne nnne enter eene trennt enne enne 39 6 3 PCB Guidelines in case of FCC certification ene iii 40 6 3 1 Transmission line design nana 40 6 3 2 Transmission line measurements teeth ono corro teet etn nr ERE DE RED ER sess esee tete nene cara e tete sees eeann 41 6 4 GSM Antenna Installation Guidelines iii eee seen 4
52. ed Telit and other 3rd Party supplied computer programs stored in semiconductor memories or other media Laws in the Italy and other countries preserve for Telit and other 3rd Party supplied SW certain exclusive rights for copyrighted computer programs including the exclusive right to copy or reproduce in any form the copyrighted computer program Accordingly any copyrighted Telit or other 3rd Party supplied SW computer programs contained in the Telit products described in this instruction manual may not be copied reverse engineered or reproduced in any manner without the express written permission of Telit or the 3rd Party SW supplier Furthermore the purchase of Telit products shall not be deemed to grant either directly or by implication estoppel or otherwise any license under the copyrights patents or patent applications of Telit or other 3rd Party supplied SW except for the normal non exclusive royalty free license to use that arises by operation of law in the sale of a product page 3 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Usage and Disclosure Restrictions License Agreements The software described in this document is the property of Telit and its licensors It is furnished by express license agreement only and may be used only in accordance with the terms of such an agreement Copyrighted Materials Software and documentation are copyrighted materials Making unauthorized copies is prohibited
53. er this simplify also the echo cancelling choose the loudspeaker with the higher sensitivity dBspl per W choose loudspeakers with the impedance close to the limit ex 16 or 8 Ohm in order to feed more power inside the transducer it increases the W Vrms ratio If this were not enough an external amplifier should be used Reproduction forbidden without Telit Communications S p A written authorization All Rights o page 61 of 89 Telit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 DAC OUTPUT EAR ccc TELIT MODULE ce L C filtering for LOW impedance load RAIL PEARY yp _y Wo pe DAC OUTPUT gt Ex EAR pr ES E NN AN rs reni NGA TELIT MODULE 4 HiZ CIRCUITRY a R C filtering for HIGH impedance load page 62 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 11 2 4 Electrical Characteristics 11 2 4 1 Input Lines Microphone Line in path Coupling capacitor gt 100nF Differential input resistance Levels To have 0dBm0 1KHz Differential input voltage AT HFMICG 0 290mVrms AT HFMICG 1 6dB AT HFMICG 2 412dB AT HFMICG 3 18dB AT HFMICG 4 24dB AT HFMICG 5 30dB AT amp HFMICG 6 36dB ATZHFMICG 7 42dB 2 25mVrms 0 dBm0 in the network are 3 14 dBfs TIP
54. f or during an ON OFF transition Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 19 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 The Flow chart showing the AT commands managing procedure is displayed below DELAY 300msec Enter AT lt CR gt AT answer OK into 1 sec NOTE Do not give any commands before 300 msec after ON OFF procedure Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 20 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 ON OFF Circuit Examples 1 If your system does not have Open Collector bus use this interface ON OFF 3K Power ON OFF impulse 2 Using a simple ON OFF external switch ica ar Nn ON OFF 3k GND Power ON OFF pacc impulse e Reproduci n forbidden without Telit Communications S p A written authorization AU Rights Reserved page 21 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 4 2 Turning OFF the GE910 Turning OFF of the device can be done in two ways e via AT command see GE910 Software User Guide ATZSHDN e bytying low pin ON OFF for at least 2s Either ways the device issues a detach request to network informing that the device will not be reachable any more To turn OFF the GE910 the pad ON OFF must be tied low for at least 2 secon
55. f the module ties directly into the SAW filter Any circuit connected to the input of the module would see complex impedance presented by the SAW filter particularly out of band rather than the relatively broad and flat return loss presented by the LNA Filter devices pass the desired in band signal to the output resulting in low reflected energy good return loss and reject the out of band signal by reflecting it back to the input resulting in high reflected energy bad return loss If an external amplifier is used with the module the overall design should be checked for RF stability to prevent the external amplifier from oscillating Amplifiers that are unconditionally stable at the output will be fine to use with the module External LNA Gain and Noise Figure The module GE910 GNSS can be used with an external LNA such as what might be found in an active antenna Because of the internal LNA the overall gain including signal losses past the external LNA should not exceed 14 dB Higher levels can affect the jamming detection capability of the module If a higher gain LNA is used either a resistive Pi or T attenuator can be inserted after the LNA to bring the gain down to 14 dB The external LNA should have a noise figure better than 1 dB This will give an overall system noise figure of around 2 dB assuming the LNA gain is 14 dB or if higher the low gain mode is automatically managed with its internal AGC The external LNA if having n
56. g chapter 6 3 1 Transmission line design During the design of the GE910 interface board the placement of components has been chosen properly in order to keep the line length as short as possible thus leading to lowest power losses possible A Grounded Coplanar Waveguide G CPW line has been chosen since this kind of transmission line ensures good impedance control and can be implemented in an outer PCB layer as needed in this case A SMA female connector has been used to feed the line The interface board is realized on a FRA 4 layers PCB Substrate material is characterized by relative permittivity e 4 6 0 4 1 GHz TanD 0 019 0 026 1 GHz A characteristic impedance of nearly 50 2 is achieved using trace width 1 1 mm clearance from coplanar ground plane 0 3 mm each side The line uses reference ground plane on layer 3 while copper is removed from layer 2 underneath the line Height of trace above ground plane is 1 335 mm Calculated characteristic impedance is 51 6 Q estimated line loss is less than 0 1 dB The line geometry is shown below 0 035 mm 0 035 mm 1 335 mm page 40 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 6 3 2 Transmission line measurements HP8753E VNA Full 2 port calibration has been used in this measurement session A calibrated coaxial cable has been soldered at the pad corresponding to GE910 RF output a SMA connector has been soldered to the
57. he resistance of the tracks has to be negligible in comparison to the load NOTES For more information refer to Telit document 80000NT10007a Audio Settings Application Note Reproduction forbidden niho Telit Communications S p A written authorization All Rights Reserved page 64 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 12 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 they report the digital value high or low present on the pad at the moment of reading Output pads can be written set the output value of the pad and read Alternate function pad internally controlled by the GE910 firmware and acts depend on implemented function The following table shows the available GPIO on the GE910 E A Drive Default PAD SUAM diis strength State es Configurable CMOS KANG Alternate function RCM GPIO iE STAT LED Configurable GPIO 02 VO GPIO ODO al DICO CXCCEN E AIC NN NOTE Pull Up or Pull Down can be set on every GPIO see AT Commands Reference Guide By default at start time if no previous set were saved they are set as Input Pull Down jl Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 65 of 89 12 1 12 2 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014
58. igh 850 5330m4 Max 882 3070mA dy 508 1882m a x EL 5 Cua kila Y i j E Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 32 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 5 3 General Design Rules The principal guidelines for the Power Supply Design embrace three different design steps e the electrical design e the thermal design e the PCB layout 5 3 1 Electrical Design Guidelines The electrical design of the power supply depends strongly from the power source where this power is drained We will distinguish them into three categories e 5V input typically PC internal regulator output e 12V input typically automotive e Battery 5 3 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 GE910 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 lea
59. ine 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 GE910 then this noise is not so disturbing and power supply layout design can be more forgiving The PCB traces to the GE910 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 reason as previous point Try to keep this trace as short as possible 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 The use of a good common ground plane is suggested 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 The power supply input cables should be
60. mic noise and ground noise also the 33pF 1000hm 33pF II RF filter has to be doubled one each wire Vmic i 1K 10K 2 5v 1u 10u ix 1007 II T 33pF ADC INPUT 100n 100 IC PERA 33pF 33pF ND 1K LA TELIT MODULE JE E j x TIP Since the J FET transistor inside the microphone acts as RF detector amplifier ask vendor for a microphone with anti EMI capacitor usually a 33pF or a 10pF capacitor placed across the output terminals inside the case SE page 59 of 89 Reproduction forbidden without Telit Communications S p A written authorization All Rights Ah Telit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 11 2 2 LINE IN connection V V LINE INH Remote_GND 100n 100 MIC T AA 33pF 33pF B ADC INPUT 100n 100 pic ll 3 NW e 33pF 33pF ND TELIT MODULE I Y di gt 100n 100 Mer 33pF 33pF ADC INPUT 100n 100 Mc J 33pF 33pF LINE_IN ono LINE_IN TELIT MODULE AE E If the audio source 1s not a mike but a different device the following connections can be done Place 100nF capacitor in series with both inputs so the DC current is blocked Place the 33pF 1000hm 33pF II RF filter in order to prevent some EMI field to get in
61. ng should be minimized The impedance value should be as close as possible to 90 Ohms differential NOTE VUSB pin should be disconnected before activating the Power Saving Mode Reproduction forbidden without Telit Communications S p A written authorization All Rights o page 53 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 10 Serial Ports The serial port on the GE910 is the core of the interface between the module and OEM hardware 3 serial ports are available on the module e MODEM SERIAL PORT 1 Main e MODEM SERIAL PORT 2 Auxiliary e MODEM SERIAL PORT 3 NMEA on GE910 GNSS products 10 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 microcontroller UART 1 8V Universal Asynchronous Receive Transmit microcontroller UART 3V or other voltages different from 1 8V microcontroller UART SV or other voltages different from 1 8V The serial port on the GE910 is a 1 8V CMOS UART with all the 8 RS232 signals It differs from the PC RS232 in the signal polarity RS232 is reversed and levels For system working on different digital supply standard a level translator circuit may be needed to make the system work properly An Example of level translation implementation could be the use of a standard 74LVC245 a Dual Supply Bus Transceiver which Logic Diagram is shown here
62. o pre select filter needs to be able to handle signals other than the GNSS signal These signals are typically at much higher levels The amplifier needs to stay in the linear region when presented with these other signals Again the system designer needs to determine all of the unintended signals and their possible levels that can be presented and make sure the external LNA will not be driven into compression If this were to happen the GNSS signal itself would start to be attenuated and the performance would suffer page 50 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 7 3 9 Powering the External LNA active antenna The external LNA needs a source of power Many of the active antennas accept a 3 volt or 5 volt DC voltage that is impressed upon the RF signal line This voltage is not supplied by the GE910 GNSS module but can be easily supplied by the host design 7 3 10 External LNA Enable The GE910 is already provided by an internal LNA In case the Application needs to include an additional LNA stage the module is provided by a digital signal usable to enable the power supply of the external amplifier The signal is set to High only when the GPS receiver is active The electrical characteristics ofthe GPS LNA EN signal are Level Min V Max V Output High Level 1 6 1 9 Output Low Level OV 0 2 Example of external antenna bias circuitry GNSS ANTENNA C1 100pF gt
63. o the GE910 ground pins page 38 of 89 Telit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Furthermore if the device is developed for the US market and or Canada market it shall comply with the FCC and or IC approval requirements This device is to be used only for mobile and fixed application In order to re use the Telit FCC IC approvals 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 6 2 GSM Antenna PCB line Guidelines e Make sure that the transmission line s characteristic impedance is 500 e Keep line on the PCB as short as possible since the antenna line loss shall be less than around 0 3 dB e Line geometry should have uniform characteristics constant cross section avoid meanders and abrupt curves e Any kind of suitable geometry structure Microstrip Stripline Coplanar Grounded Coplanar Waveguide can be used for implementing the printed transmission line afferent the antenna e If a Ground plane is required in line geometry that plane has to be continuous and sufficiently extended so the geometry can be as similar as possible to the related canonical model e Keep if possible at least one layer of the PCB used only for the Ground plane If possible use this layer as reference Ground plane for the transmission line e It is
64. oraz pozostalymi stosownymi postanowieniami Dyrektywy 1999 5 EC Portuguese Telit Communications S p A declara que este Quad Band GSM GPRS module est conforme com os requisitos essenciais e outras disposi es da Directiva 1999 5 CE Slovak Telit Communications S p A t mto vyhlasuje e Quad Band GSM GPRS module spl a z kladn po iadavky a v etky pr slu n ustanovenia Smernice 1999 5 ES Slovenian Telit Communications S p A izjavlja da je ta Quad Band GSM GPRS module v skladu z bistvenimi zahtevami in ostalimi relevantnimi dolo ili direktive 1999 5 ES Spanish Por medio de la presente Telit Communications S p A declara que el Quad Band GSM GPRS module cumple con los requisitos esenciales y cualesquiera otras disposiciones aplicables o exigibles de la Directiva 1999 5 CE Swedish H rmed intygar Telit Communications S p A att denna Quad Band GSM GPRS module st r I verensst mmelse med de v sentliga egenskapskrav och vriga relevanta best mmelser som framg r av direktiv 1999 5 EG In order to satisfy the essential requirements of 1999 5 EC Directive GE910 modules are compliant with the following standards RF spectrum use R amp TTE art 3 2 EN 301 511 V9 0 2 EN 62311 2008 EMC R amp TTE art 3 1b EN 301 489 1 V1 9 2 EN 301 489 7 V1 3 1 Health amp Safety R amp TTE art 3 1a EN 60950 1 2006 A11 2009 A1 2010 A12 2011 AC 2011 pag
65. orme aux limites d exposition aux rayonnements de la IC pour un environnement non contr l L antenne doit tre install de fa on garder une distance minimale de 20 centim tres entre la source de rayonnements et votre corps Gain de l antenne doit tre ci dessous Bande de fr quence Gain de l antenne GSM 850 6 43 dBi PCS 1900 2 75 dBi L metteur ne doit pas tre colocalis ni fonctionner conjointement avec autre antenne ou autre metteur eu Reproduction forbidden without Telit Communications S p A written authorization All Rights oh page 86 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 FCC Class B digital device notice This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one
66. out Telit Communications S p A written authorization All Rights Ah page 88 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 17 Document History Revision Date Changes Rev 0 2011 11 11 First Release Rev 0 Preliminary 1 Rev 1 2012 02 27 First Release Rev 1 Rev 2 2012 06 07 Added chapter 11 7 ADC Converter renaming pin RESET in HW SHUTDOWN Chapter 5 2 Power consumption Rev 3 2012 06 20 Added chapter 12 3 inhibit area around the RF pins Rev 4 2012 06 25 Updated chapter 15 Conformity Assessment Issues Rev 5 2012 06 28 Minor changes Rev 6 2012 07 27 Chapter 3 2 The pin E13 is RESERVED chapter 3 1 pin R13 pinR12 and BI Rev 7 2012 10 12 Changed name of Chapter 10 1 from AF IN to MIC added a note about USB 2 0 FS Rev 8 2012 10 30 Updated chapter 10 3 Rev 9 2013 03 01 Updated GNSS features Pin out DVI Power Consumptions plots Reel Packaging Rev 10 2013 03 25 Updated the default NMEA speed to 115200 updated some fields on GNSS variant e g Acquisition GNSS consumption Rev 11 2013 05 29 Updated with GE910 QUAD V3 variant additional regulatory notice in section 15 Rev 12 2013 08 26 Updated Chapter 5 1 Power Supply Requirements updated flow chart on Chapter 4 2 Turning OFF the GE910 Rev 13 2013 11 05 Updated Chapter 15 with EN 62311 2008 AC 2011 and antenna Gain for FCC and IC added GNSS ON OFF table in Chapter 7 Rev 14 2014 05 06 Updated Chapter 5 2 Po
67. publication may contain references to or information about Telit products machines and programs programming or services that are not announced in your country Such references or information must not be construed to mean that Telit intends to announce such Telit products programming or services in your country Copyrights This instruction manual and the Telit products described in this instruction manual may be include or describe copyrighted Telit material such as computer programs stored in semiconductor memories or other media Laws in the Italy and other countries preserve for Telit and its licensors certain exclusive rights for copyrighted material including the exclusive right to copy reproduce in any form distribute and make derivative works of the copyrighted material Accordingly any copyrighted material of Telit and its licensors contained herein or in the Telit products described in this instruction manual may not be copied reproduced distributed merged or modified in any manner without the express written permission of Telit Furthermore the purchase of Telit products shall not be deemed to grant either directly or by implication estoppel or otherwise any license under the copyrights patents or patent applications of Telit as arises by operation of law in the sale of a product Computer Software Copyrights The Telit and 3rd Party supplied Software SW products described in this instruction manual may include copyright
68. r Guide 1vv0300962 Rev 14 2014 05 06 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 Power Supply Requirements The external power supply must be connected to VBATT amp VBATT PA signals and must fulfill the following requirements GE910 QUAD V3 POWER SUPPLY Nominal Supply Voltage 3 8 V Normal Operating Voltage Range 3 40 V 4 20 V Extended Operating Voltage Range 3 10 V 4 50 V NOTE The Operating Voltage Range MUST never be exceeded care must be taken when designing the application s power supply section to avoid having an excessive voltage drop If the voltage drop is exceeding the limits it could cause a Power Off of the module The Power supply must be higher than 3 22 V to power on the module NOTE Overshoot voltage regarding MAX Extended Operating Voltage and drop in voltage regarding MIN Extended Operating Voltage MUST never be exceeded The Extended Operating Voltage Range can be used only with completely assumption and application of the HW User guide suggestions 7 gt gy lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 5 2 Power Consumption The GE910 QUAD GNSS power consumptions are GE910 QUAD GNSS
69. r 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 Communications S p A other than for circuitry embodied in Telit products This document is subject to change without notice page 11 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 3 GE910 module connections SL PIN OUT Pol Se Jr o como A A OA Reserved on GE910 QUAD V3 HE eee C103 TXD Serial data input from DTE CMOS 1 8V E C104 RXD En Serial data output to DTE CMOS 1 8V UARTI M14 C108 DTR EN Input for DTR from DTE CMOSLSV C105 RTS ES Input for Request to send signal RTS from DTE CMOS 1 8V A C106 CTS O Output for Clear to Send signal CTS to DTE CMOS L8V C109 DCD Ko Output for DCD to DTE CMOSLSV P14 C107 DSR O Output for DSR to DTE CMOSLSV R14 CI25 RING Output for Ring RI to DTE CMOS 1 8V A Asynchronous Auxiliary UART2 D15 TX AUX a Auxiliary UART TX Data to DTE 1 8V RX AUX Auxiliary UART RX Data from DTE CMOS 1 8V UART2 SIMVCC External SIM signal Power supply for the SIM EA AS Bo DVI WAO Digital Audio Interface WA0 CMOSISV B6 DVI RX Digital Audio Interface RX CMOS L8V B7 DVI TX vo Digital Audio Interface TX CMOS L8V o aae DVI CLK C Digital Audio Interface CLK CMOS 1 8V L Values 0 to 1 3V N ADC INI DECLINE Analog to Digital converter input BECERET
70. ser Guide 1vv0300704 e Telit GE910 Family Ports Arrangements 1vv0301049 page 10 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Overview The aim of this document is the description of some hardware solutions useful for developing a product with the Telit GE910 module In this document all the basic functions of a mobile phone will be taken into account for each one 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 GE910 module For further hardware details that may not be explained in this document refer to the Telit GE910 Product Description document where all the hardware information is reported NOTICE The integration of the GSM GPRS GE910 cellular module within user application shall be done according to the design rules described in this manual The information presented in this document is believed to be accurate and reliable However no responsibility is assumed by Telit Communications S p A for its use nor any infringement of patents o
71. ser Guide 1vv0300962 Rev 14 2014 05 06 4 Hardware Commands 4 1 Turning ON the GE910 To turn on the GE910 the pad ON OFF must be tied low for at least 5 seconds and then released The maximum current that can be drained from the ON OFF pad is 0 2mA 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 GE910 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 ends with or with a bar over the name TIP To check if the device has powered on the hardware line PWRMON should be monitored The device is powered on when PWRMON goes high NOTE It is mandatory to avoid sending data to the serial ports during the first 200ms of the module start up d el D Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 18 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 The flow chart showing the proper TURN ON procedure is displayed below WAIT gt 1 Sec NOTE In order to avoid a back powering effect it is recommended to avoid having any HIGH logic level signal applied to the digital pins of the GE910 when the module is powered of
72. st 10V e A protection diode should be inserted close to the power input in order to save the GE910 from power polarity inversion An example of linear regulator with 5V input is LINEAR REGULATOR 3 8 OUT i E 4 22 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 33 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 5 3 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 GE910 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 In any case the frequency and Switching design selection is related to the application to be developed due to the fact the switching frequency could also generate EMC interferences 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 capaci
73. stered turning off A schematic example could be VBATT STAT LED i E 4 22 Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 67 of 89 12 4 12 5 12 6 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Using the TX DISABLE Transmission Control GPIO4 The GPIO4 pin when configured as RF Transmission Control Input permits to disable the Transmitter when the GPIO is set to Low by the application In the design is necessary to add a resistor 47K pull up to 1 8V this pull up must be switched off when the module is in off condition Using the RFTXMON Output GPIOS The GPIOS pin when configured as RFTXMON Output is controlled by the module and will rise when the transmitter is active and fall after the transmitter activity is completed There are 2 different modes for this function 1 Active during all the calls For example if a call is started the line will be HIGH during all the conversation and it will be again LOW after hanged up The line rises up 300ms before first TX burst and will became again LOW from 500ms to 1s after last TX burst 2 Active during all the TX activity The GPIO is following the TX bursts Please refer to the AT User interface manual for additional information on how to enable this function Using the Alarm Output GPIO6 The GPIO6 pad when configured as Alarm Output is controlled by the module an
74. stomer s application We recommend connecting them also to dedicated test point A PADs for GE910 Signl ELGLHIJLLLA2 E2 F2 G2 H2 J2 K2 L2 R2 M3 N3 P3 R3 M4 N4 P4 R4 N5 P5 R5 N6 P6 R6 P8 R8 P9 P10 R10 M12 B13 P13 E14 GND RI3 HW SHUTDOWN PIS C106 CTS ADDITIONAL PADs Signal for GE910 GNSS onl FU R ANTENNA GNSS GNSS EN GNSS NMEA TX GNSS NMEA RX NOTE Not used pins apart from table above can be left unconnected RTS pin should be connected to the GND on the module side if flow control is not used page 16 of 89 Telit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 3 3 LGA PADSs Layout TOP VIEW C105 RTS C108 DTR CIO4 RXD C103 TXD C106 CTS The pin defined as RES has to be considered RESERVED and not connected on any pin in the application The related area on the application has to be kept empty Pin G14 J14 K14 R7 R9 are available only on GE910 GNSS variant Pin B15 C15 A13 are NOT available on GE910 QUAD V3 variant C109 DCD CIOZ DSR C125 RING gen mm E af Hg nn i e ge ka bi ne I r a Reproduction forbidden without Telit Communications S p A written authorization All Rights Reserved page 17 of 89 IF lelit GE910 Hardware U
75. t Communications S p A written authorization All Rights Reserved page 45 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 7 2 2 External Host Controlled Mode Standalone In External Host Controlled Mode the GNSS receiver is fully controlled by an external customer host The following AT commands must be issued before operating in External Host Controlled Mode to be sure the GSM side of GE910 GNSS is not driving the GNSS receiver AT GPSP 0 AT GPSD 0 AT GPSSAV AT REBOOT The GNSS receiver can be now turned on by driving the GNSS_EN pin LOW and turned off by driving it HIGH In External Host Controlled Mode a customer host can retrieve the NMEA stream and send NMEA specific commands by interfacing directly to the GNSS UART3 as shown in the figure below GNSS_EN GNSS_NMEA_TX GNSS_NMEA_RX Customer Host USB1 USB2 UART1 Required Circuital Connection Optional Circuital Connection Reproduction forbidden without Telit Communications S p A written authorization AU Rights Reserved page 46 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 NOTE The default GNSS UART3 GNSS NMEA TX GNSS NMEA RX serial configuration is as follows NMEA 115200 bps 8 data bits no parity and 1stop bit TIP To check if the GNSS device has powered on you can use the GNSS LNA EN it goes high on power on until first fix and only then it may pulse for
76. to be during transmission 1W max during VOICE calls and 2W max during class10 GPRS upload This generated heat will be mostly conducted to the ground plane under the GE910 you must ensure that your application can dissipate it a re a 5 3 3 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 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 decrease the power supply performances The Bypass low ESR capacitor must be placed close to the Telit GE910 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 GE910 is wide enough to ensure a drop less connection even during the 2A current peaks The protection diode must be placed close to the input connector where the power source is drained 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 l
77. to the high impedance high gain MIC inputs Since the input is differential the common mode voltage noise between the two different grounds is rejected provided that both MIC amp MIC are connected directly onto the source L y Reproduction forbidden without Telit Communications S p A written authorization All Rights d A page 60 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 11 2 3 EAR connection EAR DAC OUTPUT TELIT MODULE The audio output of the GE910 is balanced this is helpful to double the level and to reject common mode click and pop are common mode and therefore rejected furthermore the output stage is class D so it can manage directly a loudspeaker with electrical impedance of at least 8Ohm This stage is powered by switching from VBATT to GND at a frequency ranging from 0 6 to 2MHz so it has a good efficiency and a power budget up to 0 7W being a class D architecture please use some caution see the NOTE below NOTE When the loudspeaker is connected with a long cable an L C filter is recommended When the EAR are feeding some electronic circuitry an R C filter is recommended TIP in order to get the maximum audio level at a given output voltage level dBspl Vrms the following breaking through procedure can be used Have the loudspeaker as close as you can to the listen
78. ty 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 protection 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 GE910 from power polarity inversion This can be the same diode as for spike protection An example of switching regulator with 12V input is in the below schematic SWITCHING REGULATOR 12V INPLIT inni Es 2 8V OUT 4 7K EA 5 FT a Vi page 34 of 89 5 3 1 3 Telit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 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 Ion cell battery type is suited for supplying the power to the Telit GE910 module WARNING 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 GE910 and damage it NOTE DON T USE any Ni Cd Ni MH and Pb battery types directly connected with GE910 Their use can lead to overvoltage on the GE910 and damage it USE ONLY Li Ion battery types e A Bypass low ESR c
79. uct is providing the Digital Audio Interface DVI on the following Pins Digital Voice Interface DVI PAD Signal VO Function Note Type Digital Audio Interface Word B9 DVI WAO I O Alionment LRODIO CMOS 1 8V B6 DVI RX I Digital Audio Interface RX CMOS 1 8V B7 DVI TX O Digital Audio Interface TX CMOS 1 8V B8 DVI CLK VO Digital Audio Interface BCLK CMOS 1 8V NOTE For more information refer to Telit document 80000NT10004a Digital Voice Interface Application Note Analog Front End MIC connection The bias for the microphone has to be as clean as possible the first connection single ended is preferable since the Vmic noise and ground noise are fed into the input as common mode and then rejected This sounds strange usually the connection to use in order to reject the common mode is the balanced one In this situation we have to recall that the microphone is a sound to current transducer so the resistor is the current to tension transducer so finally the resistor feeds the input in balanced way even if the configuration from a microphone point of view seems to be un balanced page 58 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 Vmic PULL 1K 10K 100n ox dd 245v 1u 10u HA ADC INPUT 2 2K 100n 100 IC Pa A 33pF 33pF TELIT MODULE JE ua 3 Y If a balanced way is anyway desired much more care has to be taken to V
80. ures advanced real time hardware correlation engine for enhanced sensitivity navigation engine PVT Fast Acquisition giving rapid Time to First Fix TTFF low power consumption and fast time to first fix 32 track verification channels stand Alone and Assisted mode and Satellite Based Augmentation Systems SBAS WAAS EGNOS and MSAS It also offers an accurate timing pulse and jamming immunity Operation in a high interference signal environment is common practice in today s electronic age By incorporating 3 stage rejection architecture it is able to remove interfering signals pre and post correlation With the help of advanced digital signal processing algorithms and the use of A GPS data the receiver is capable to achieve higher sensitivity values required for indoor applications The following table is listing the GE910 variants that support the GNSS receiver Product GNSS Receiver GE910 GNSS YES GE910 QUAD NO GE910 QUAD V3 NO 7 1 GNSS Signals Pin out GNSS SECTION ERN E ECT R9 ANTENNAGNSS GNSS Antenna S0ohm RF Open Colector active low GNSS EN External GNSS ON OFF VBATT ref UART3 or GNSS NMEA RX UART NMEA Input UART3 GNSS LNA EN O GNSS External LNA Enable Active Antenna Control Taba GNSS Receiver Control The GNSS receiver of the GE910 GNSS module can be used in two ways GSM Controlled Mode or simply Controlled Mode or External Host Controlled Mode or simply
81. wer Consumption Updated Chapter 7 1 GNSS Receiver Control page 89 of 89
82. wise to surround on both sides the PCB transmission line with Ground avoid having other signal tracks facing directly the antenna line track e Avoid crossing any un shielded transmission line footprint with other signal tracks on different layers e The ground surrounding the antenna line on PCB has to be strictly connected to the main Ground Plane by means of via holes once per 2mm at least placed close to the ground edges facing line track e Place EM noisy devices as far as possible from GE910 antenna line e Keep the antenna line far away from the GE910 power supply lines e If EM noisy devices are present on the PCB hosting the GE910 such 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 If EM noisy devices are not present around the line the use of geometries like Microstrip or Grounded Coplanar Waveguide has to be preferred since they typically ensure less attenuation if compared to a Stripline having same length page 39 of 89 lelit GE910 Hardware User Guide 1vv0300962 Rev 14 2014 05 06 6 3 PCB Guidelines in case of FCC certification In the case FCC certification is required for an application using GE910 according to FCC KDB 996369 for modular approval requirements the transmission line has to be similar to that implemented on GE910 interface board and described in the followin

Download Pdf Manuals

image

Related Search

Related Contents

  取扱説明書 変換器 KF3  MOLIN MOLETTE - Ligue de l`enseignement du Cher  Altivar 71 - Schneider Electric  Electrolux 533310 Dishwasher User Manual  Bedienungsanleitung  Bedienungsanleitung Leckage-Prüfgerät PCE  小型電子POP シリーズ  

Copyright © All rights reserved.
Failed to retrieve file