GPS Receiver A1080
Contents
1. t 26 10 5 2 External reset IRSE AEDEM 26 10 0 Batory BACK UD degen 2 10 7 Push to Fix Mode E 28 10 8 Hibernate WIO OS E 28 11 Evaluation Kit EVATIOSO A eeKNRKRKN KREE ENNER eene nunmehr EN ENNEN enun manns 29 NEEN 30 11 2 Related Docu tmienls nrr rtt re teer ren en ER EE TEE e E TE EE MERE 30 iram aad m eee ee 31 kale ial r E ee ee ee see ee 31 V4 2 Jul 09 User s Manual Page 5 of 31 Wiacetect 1 Introduction Vincotech s GPS modules A1080 A and B are highly integrated GPS receiver mod ules that can be used as SMT components They are capable of receiving signals from up to 20 GPS satellites and transferring them into position and timing informa tion that can be read over a serial port This new generation of GPS modules com bines small size and high end GPS functionality at low power consumption Operable at 3 3V 23mA typ 1fix per second Small form factor of 19 x 16 2 mm 0 75 x 0 64 On board antenna supply voltage feed Single sided SMD component for reflow soldering Tape amp reel packaging The difference between the A and the B version is the supported temperature range While the A can be operated from 30 C to 85 C the B version extends this range down to 40 C The A1080 A and B GPS receivers are available as off the shelf components 100 tested and shipped in standard tape and reel package 1 1 Label The A1080 A labels h2. 4 77 07 0 00 00 0 00 00 19 05 75 All dimensions in mm inch Figure 5 Mechanical outline component side A1080 V4 2 Jul 09 User s Manual Page 12 of 31 WMincatach 4 2 Details Solder Side A1080 1 37 1 37 16 24 JUUUUUUUULUL 0 47 SUE EE 13 50 1 37 1 37 19 05 Solder pad size 1 0 x 0 8 All dimensions in mm Figure 6 Mechanical outline solder side A1080 V4 2 Jul 09 User s Manual Page 13 of 31 d N incotech 5 Pin out Information 5 1 Layout A1080 HW revision 04 GND VANT Viec Res Vbak GNDANT 1PPS ANT RX1 GNDANT TX1 GPIOO TXO Res RXO Res nRST Res ON OFF MAKEUP BOOTSEL RFPWUP Figure 7 Pin out information A1080 V4 2 Jul 09 User s Manual Page 14 of 31 Uf Wiacstech 5 2 Description A1080 Signals HW revision 04 Pin Symbol Function Description 1 GND Power Supply Ground power supply 2 wes Power Supply Power Supply 3 0 3 6 VDC power supply Mk Power Supply Back up pin of module for super cap or battery see below 4 PPS Output Output 1PPS rius per SE output 5 RXi mput Send input 1 unused in current firmware leave open 6 TX1 Output Serial output 1 unused in current firmware leave open 8 ma mu jSeilimwt0NMEAm 9 mST mot Reeipu BOOTSEL opecial boot mode leave open for normal operation Antenna Ground do not connect
3. and SRAM V4 2 Jul 09 User s Manual Page 28 of 31 Wincotech 11 Evaluation Kit EVA1080 A For demonstration and easy evaluation of GPS performance Vincotech offers an evaluation kit including one GPS A1080 A module It contains a USB interface with according drivers to connect easily to a PC The USB interface is an extension of the serial port 0 therefore sending NMEA sentences and accepting commands At the same time it provides power to the module Accompanied by an antenna it offers a ready to go set For the development of new software and applications the Evaluation Kit also pro vides NMEA messages on CMOS level via a terminal plug Figure 15 Evaluation kit EVA1080 A For further information please contact Vincotech V4 2 Jul 09 User s Manual Page 29 of 31 Minentech 11 1 Contact This manual was created with due diligence We hope that it will be helpful to the user to get the most out of the GPS module Anyway inputs about errors or mistakable verbalizations and comments or propos als to Vincotech Germany for further improvements are highly appreciated Vincotech GmbH Bibergerstr 93 82008 Unterhaching Munich Germany Tel 49 89 8780 67 0 Fax 49 89 8780 67 351 gps vincotech com www vincotech com gps 11 2 Related Documents GPS Receiver A1080 Vincotech GPS Evaluation Kit EVA1080 Vincotech GPS AppNote EDLC Backup A1080 Vincotech GPS AppNote Backup A1080 Vincotech GPS AppNote Ge
4. current is typically only the first two seconds of TTFF 3 Tracking current typically includes tracking and the post acquisition portion of TTFF 4 During standby state RTC block and core powered on and clock off 6 2 Absolute maximum ratings Symbol Parameter Min Max Unit Itdv Vant antenna supply voltage lant antenna supply current EK Tst Mo D Table 6 Absolute maximum ratings stresses beyond those listed under Absolute Maximum Ratings may cause per manent damage to the device This is a stress rating only Functional operation of the device at these or any other conditions beyond those indicated in the opera tional sections of this specification is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability V4 2 Jul 09 User s Manual Page 17 of 31 Vi nuntach 6 3 DC Electrical Characteristics Symbol Parameter o 1PPS Tat TXO RFPWUP nWAKEUP Parameter __ Min Max Unit D Vo 1 02 V EXIERXS RXO Vh 2 J4J 20 Vc V EE vi CSCS BTV ebe ee ONOFF JN y J 084 15 V MMC 3938 V Table 7 DC Electrical Characteristic V4 2 Jul 09 User s Manual Page 18 of 31 Waegptsch 7 Mounting This chapter covers the mounting of the A1080 A B 7 1 Proposed Footprint for Soldering The following proposal of a footprint for soldering is assuming a stencil thickness of 150um X marks the cente
5. COTECH THIS DOCUMENT MAY PROVIDE LINKS TO OTHER WORLD WIDE WEB SITES OR RESOURCES BECAUSE VINCOTECH HAS NO CONTROL OVER SUCH SITES AND RESOURCES VINCOTECH SHALL NOT BE RESPONSIBLE FOR THE AVAILABILITY OF SUCH EXTERNAL SITES OR RESOURCES AND DOES NOT ENDORSE AND IS NOT RESPONSIBLE OR LIABLE FOR ANY CONTENT ADVERTISING PRODUCTS OR OTHER MATERIALS ON OR AVAILABLE FROM SUCH SITES OR RESOURCES VINCOTECH SHALL NOT BE RESPONSIBLE OR LIABLE DIRECTLY OR INDIRECTLY FOR ANY DAMAGE OR LOSS CAUSED OR ALLEGED TO BE CAUSED BY OR IN CONNECTION WITH USE OF OR RELIANCE ON ANY SUCH CONTENT GOODS OR SERVICES AVAILABLE ON OR THROUGH ANY SUCH SITE OR RESOURCE VINCOTECH RESERVES THE RIGHT TO CHANGE MODIFY OR IMPROVE THIS DOCUMENT OR THE PRODUCT DESCRIBED HEREIN AS SEEN FIT BY VINCOTECH WITHOUT FURTHER NOTICE V4 2 Jul 09 User s Manual Page 3 of 31 Wincotech Table of Contents 1 Introduction EP 6 MEE EE 6 S74 Characteristics eeh 7 12 ba ee e T 1 2 2 Mechanical Charachertstce nennen nennen nennen T To NANNING TC A ONS EM 1 2 Ordering Information m S 8 ZA GPS Receivers TR AE 8 22 PACKING ON MCATTI UC 8 PACAN E GUMO EE 9 3 QUICK Ce dE 10 3 1 Minimum Configuration ces ccesscsvosaverssncusecssncetnsesnsuinacsasudoncbanatnachsastametaeneecsectsines 10 GE E E 11 3 9 Oal ENEE 11 S mile OVa TIFI E 11 4 Mechanical Outline A eeekeEeREERREENRREENRREENREENREEN EEN REEN REENEN REENEN REEE REES Ek 12 4 1 Detail
6. Vincotech GPS Receiver A1080 A Description of Vincotech s GPS Receiver Module A1080 A B User s Manual Version 4 2 Hardware Revision 04 Wincotech Revision History Rev Date Description gt 4 1 111 SE 08 HW version 02 amp 03 deleted HW version 04 added DC Electrical Characteristics added Hybernate Mode added link to 1PPS appli cation note and 1PPS timing accuracy remarks added contact de tails email addresses corrected storage temperature corrected minor changes E 07 09 Additional note on Tracking Sensitivity regarding antenna added hint about Ephemeris Push in FW 3 5 0 corrected reflow soldering Tv NN V4 2 Jul 09 User s Manual Page 2 of 31 Wincotech Disclaimer THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF VINCOTECH GMBH IT MAY NOT BE COPIED OR TRANSMITTED BY ANY MEANS PASSED TO OTHERS OR STORED IN ANY RETRIEVAL SYSTEM OR MEDIA WITHOUT PRIOR CONSENT OF VINCOTECH OR ITS AUTHORIZED AGENTS THE INFORMATION IN THIS DOCUMENT IS TO THE BEST OF OUR KNOWLEDGE ENTIRELY CORRECT HOWEVER VINCOTECH CAN NEITHER ACCEPT LIABILITY FOR ANY INACCURACIES OR THE CONSEQUENCES THEREOF NOR FOR ANY LIABILITY ARISING FROM THE USE OR APPLICATION OF ANY CIRCUIT PRODUCT OR EXAMPLE SHOWN IN THE DOCUMENT THE PRODUCT HARD AND SOFTWARE DESCRIBED IN THIS DOCUMEN TATION IS NOT AUTHORIZED FOR USE IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF VIN
7. bak bak lt H K NSK01 330 Supercap Battery GND GND Backup Supply Options A Supercap charged through GPS module B Primary cell decoupled with diode Figure 14 Application note Module back up An alternative to this solution is to switch the supply voltage from the Vcc pin to the Vbak pin Care needs to be taken that the there is no voltage outage during the switch over phase The Vbak pin draws 20pA typically V4 2 Jul 09 User s Manual Page 27 of 31 Minentech 10 7 Push to Fix Mode Push to Fix mode is designed for the application that requires infrequent position reporting The receiver generally stays in a low power mode up to 2 hours but wakes up periodically to refresh position time ephemeris data and RTC calibration The push to fix mode is initialized and entered using the SiRF Binary Protocol Please refer to the according manual especially the paragraph Set TricklePower Parameters In order to request a fix outside the specified duty cycles it is neces sary to toggle the pin ON OFF Toggling is done by pulling the signal to HIGH for about 100ms see also AppNote Firmware A1080 10 8 Hibernate Mode From Firmware version 3 2 5 firmware support for ON OFF has been included hence a rising pulse on the ON OFF pin will put the A1080 GPS receiver into hi bernate state if it is on and wake up if it is in sleep state During sleep state the re ceiver draws 20pA typically and maintains RTC
8. d quick start with the modules A1080 A B this chapter provides a short overview on the most important steps to receive NMEA messages with position information on a serial port 3 1 Minimum Configuration The following picture shows a recommended minimum configuration for NMEA out put and commands sent and received via an RS232 interface based on the GPS module A1080 A identical for A1080 B VANT lt for 3 3 active antenna W3 lt _ gt Pin 22 ANT Antenna e Input 200hm strip line 51050 epe CMDANT ESr3 oul pul Di Vbak HEUS TU Bai 1 ery B1 DES female gt CND Backup Supply Dol ions A Supercap cha ped through GPS module En Primary cell dacaounled nith diode Figure 4 Recommended minimum configuration A1080 Remarks e Place C1 to C5 here O 1uF close to MAX3232 For capacity values see datasheet of actual component used Use 3 3V level shifter MAX3232 or equivalent Use separate ground plane for antenna ground Antenna input impedance is 50Ohm Match as close as possible Maximum allowed antenna current is 50mA Consider a current limiter see chapter 10 2 2 Antenna Sensor with Current Limiter e A battery back up circuit for the RTC Real Time Clock should be consid ered see chapter 10 6 Battery Back up NOTE Please make sure the A1080 A B is mounted either electrically shielded or at least protected from direct airflow This avoids degradation of GPS performance ge
9. demonstrated in the drawing E 4 A Z Z msn e w Vias to Solder pads Vias to Top layer GND layer Solder pads Figure 9 Antenna connector strip line A1080 In order to gain the impedance of 506 the width of the strip line needs to be calcu lated It depends on the thickness or height of the PCB layer both parameters are shown in following drawing For the calculation it is assumed that the PCB mate rial is FRA 902 strip line GPS Module Motherboard AntGND Figure 10 Strip line parameters A1080 In this case the width should be about 1 8 times the height of the PCB W 1 8 x H In the example one would get a width of W 1 8 x 0 8mm 1 44mm V4 2 Jul 09 User s Manual Page 20 of 31 Woacotect 8 2 Active Antenna General GPS active antenna specification Limitations e Supply voltage according to voltage fed into VANT pin 5V max e Supply current 50mA max Recommendations e Gain 2 20dB should not exceed 35dB e Noise figure lt 1 5dB The recommendations apply to the majority of active antennas that can be found in the market Anyhow the quality of the GPS antenna chosen is of paramount impor tance for the overall sensitivity of the GPS system The system design needs to reflect the supply voltage of the antenna If the supply voltage is equal to Vcc Vcc can be connected to VANT If the antenna requires a different supply voltage the antenna bias can be provided th
10. eeceeteeteeceeseeeeeeeeeeeeseeseeeeeseeseeseesaes 15 Table 5 A1080 electrical characteristics ccccccceccceeceecceeceeceeceeceeeeeeseesaeesans 17 Table 6 AOSOIING MaxXiMUM Falli uscsesuss iui 52009 0q ap OSqH E IUOS Isa PI sd e ESE Nr r EENT e EFE 17 Table 7 DC Electrical Charachertetc 18 Table 8 Reflow soldering profile ATOSU 19 Table 9 Environmental conditions ccccccecceeceeceeceeceeeeeeaeeaeeeeeceeeeecsecseseeseeeaes 22 V4 2 Jul 09 User s Manual Page 31 of 31
11. ll be valid 10 5 1 Internal reset circuit The A1080 is already equipped with a voltage monitoring device that generates a proper power on reset at the appropriate threshold and delay Additionally it takes care about the brown out protection Usually there is no need to deal with the reset input externally thus the general advice is to leave this pin open 10 5 2 External reset circuit If for some reasons an external reset input is really desired the following in structions are recommended 1 Only use an open drain collector device e g a bipolar NPN transistor to ground see Fig 1 to pull the nRST pin low in order to issue a reset 2 A1080 Hardware version 04 will work without any problem in applications fol lowing the previous External Reset Circuit recommendations for Hardware Version 02 and 03 Note Never pull the nRST pin actively high in case Vcc is present nRESET RESETS LS nRESET lou active RESET high active Figure 13 Application note Recommended external reset circuit V4 2 Jul 09 User s Manual Page 26 of 31 Waegptsch 10 6 Battery Back up This application note describes how to back up the RTC and the SRAM of the GPS receiver module The basic of the first examples is to provide a back up by a separate battery or a super cap While the super cap is charged thru the module during normal operation the bat tery primary cell is decoupled thru a diode D V
12. nerated by temperature fluctuations see GPS AppNote RF shield A1080 V4 2 Jul 09 User s Manual Page 10 of 31 WWlaegtech 3 2 Antenna It is recommended to use an active GPS antenna with supply voltage of 3 to 5VDC and a current draw of 50mA maximum The quality of the GPS antenna chosen is of paramount importance for the overall sensitivity of the GPS system An active an tenna should have a gain 2 20dB and a noise figure lt 1 5dB which applies to more than 95 of the active antennas available in the market 3 3 Serial Port Settings The default configuration within the standard GPS firmware is e Serial 0 NMEA 4800 baud 8 data bits no parity 1 stop bit no flow control 3 4 Improved TTFF In order to improve the TTFF Time To First Fix it is recommended to support the RTC with a back up power supply when no system power is available see chapter 10 6 Battery Back up Furthermore starting with FW revision 3 5 0 Ephemeris Push is supported Please see according application note V4 2 Jul 09 User s Manual Page 11 of 31 Wiacotect 4 Mechanical Outline 4 1 Details Component Side A1080 1824 84 3 1447 57 1447 57 1320 52 13 20 52 11 93 47 11 93 47 10 06 42 4 10 66 42 9 38 37 9 30 37 8 12 32 t 8 12 32 6 88 27 6 85 27 5 58 22 5 58 22 431 17 1 434 17 3 04 12 3 04 12 1 77 07
13. oHelix Antenna A1080 Vincotech GPS AppNote Firmware A1080 Vincotech GPS AppNote nRST A1080 Vincotech GPS AppNote RF shield A1080 Vincotech GPS AppNote 1PPS Pulse Width Vincotech GPS AppNote ResetControl A1080 Vincotech V4 2 Jul 09 User s Manual Page 30 of 31 Wincotech 12 List of Figures Foue MEMES UTI MEET UU UMS 6 Figure 2 A1080 tape specifications Il 8 Figure 3 A1080 tape specifications 7 9 Figure 4 Recommended minimum configuration A1080 ssssuesse 10 Figure 5 Mechanical outline component side ATI 12 Figure 6 Mechanical outline solder side ATIOUU cc cccccecceeeseeseeeeeeseeeeeeaeees 13 Figure 7 Pin out information ATOS0 nennen 14 Figure 8 Soldering footprint proposal ATIUSU 19 Figure 9 Antenna connector strip line ATIUGU cee cecceecceeceeeseeseeeeeeseeeaeeaeees 20 Figure 10 Strip line parameters ATIUS0U nnne 20 Figure 11 Application note Antenna sensor adaptation 24 Figure 12 Application note Antenna sensor adaptation with current limiter 24 Figure 13 Application note Recommended external reset Circuit 26 Figure 14 Application note Module back up 2f Figure 15 Evaluation kit EVA1080 A EE 29 13 List of Tables Table 1 A1080 GPS characteristics EE 7 Table 2 A1080 dimensions and weight 7 Tale 3 Ce ed Lei Re IER 9 Table 4 Pin description A1080 cc cceccecceccecc
14. olds the following information Hardware rr Hardware Ausgabe Hardware Release Software i Software Release sss Software Version Datecode and Location BZ Munich YK Bicske ww Woche week yyri Johr 7 Year Figure 1 A1080 A label The A1080 B s label shows a B instead of the A V4 2 Jul 09 User s Manual Page 6 of 31 Uf Wincotech 1 2 Characteristics The modules are characterized by the following parameters 1 2 1 GPS Characteristics Channels 20 parallel tracking Correlators 200 000 plus Frequency IDEMS Tracking Sensitivity 1 j 159dBm Time To First Fix TTFF 0 15s theoretical minimum values values in real world may differ Table 1 A1080 GPS characteristics 1 Typical with external active antenna see also paragraph 3 2 Antenna 2 The calibrated clock of the receiver has not stopped thus it knows precise time to the us level 3 The receiver has estimates of time date position and valid almanac and ephemeris data 4 The receiver has estimates of time date position and recent almanac 5 The receiver has no estimate of time date position and no recent almanac 1 2 2 Mechanical Characteristics A1080 Mechanical dimensions Length 19mm 0 75 Width 16 2mm 0 64 Height 2 4mm 0 095 A1080 Weight 82g 0 04202 Table 2 A1080 dimensions and weight 1 3 Handling Precaution
15. r of the through holes Figure 8 Soldering footprint proposal A1080 Please note that copper and solder paste footprint are identical The final footprint has to be evaluated and qualified by the manufacturer according to the specific processes 7 2 Recommended Profile for Reflow Soldering Typical values for reflow soldering of the module in convection or IR convection ov ens are as follows according to IPC JEDEC J STD 020D in 60 Temperature maintained above 217 C 60 150 seconds Time within 5 C of actual peak temperature Ramp down rate 6 C second max Time 25 C to peak temperature Table 8 Reflow soldering profile A1080 As results of soldering may vary among different soldering systems and types of solder and depend on additional factors like density and types of components on board the values above should be considered as a starting point for further optimi zation V4 2 Jul 09 User s Manual Page 19 of 31 Wincotech 8 Use of Antenna 8 1 Connection of RF Signal The ANT pin is used to connect the receiver with the GPS antenna The design of the antenna connection has to be done strictly according to RF design rules A 50 PCB strip line is required The following drawings shall explain the guidelines A major rule is to keep the strip line as short as possible Additionally antenna ground GNDANT should be routed to the ground plane of the PCB the ground plane is on a lower PCB layer by via as
16. r with Current Limiter This proposal is similar to the first one but includes a current limiter Comments and notes as above apply We strongly recommend simulating and testing your realized version before use In any case it is the responsibility of the designer to test and verify the implementation Current Limiter Ui U2 rail to rail single supply comperator with open drain output Common node on PCB Output open drain with pullup R2 High for 8m lant 18mA Low for lant 9mA or lant gt 18mA Figure 12 Application note Antenna sensor adaptation with current limiter V4 2 Jul 09 User s Manual Page 24 of 31 Wincotech 10 3 VANT Pin antenna voltage input pin The VANT pin is an input pin The supply voltage for an active GPS antenna has to be fed into the Vant pin The easiest way to do that is to connect Vcc to VANT The maximum current is SOMA Note Shortcut between ANT and GND may damage the A1080 A B GPS receiver module This should be avoided by using an antenna current limiter The circuit chapter 10 2 2 Current Limiter works for Vcc from 3V to 5V The an tenna current will be limited to 50mA approximately If other transistors are used other resistor values may be necessary as well We strongly recommend simulating and testing your realized version before using it 10 4 1PPS pin 1 pulse per second pin The 1PPS pin is an output pin In addition to precise positioning GPS al
17. rough the VANT pin V4 2 Jul 09 User s Manual Page 21 of 31 Wincotech 9 Quality and Reliability 9 1 Environmental Conditions Operating temperature 30 C 85 C A1080 A Operating temperature 40 C 85 C A1080 B Operating humidity Storage 40 C 85 C 6 months in original package Table 9 Environmental conditions 9 2 Product Qualification Prior to product qualification the GPS receiver is preconditioned according to EIA JEDEC standard JESD22 A113 B Level 3 Basic qualification tests MSL Classification according to J STD 020C MSL3 245 C MSL Rework Compatibility according to J STD 020C Temperature Cycling 30 C 85 C A1080 A Temperature Cycling 40 C 85 C A1080 B Temperature Humidity Bias 70 C 85 RH Low High Temperature Operating 30 C 85 C A1080 A Low High Temperature Operating 40 C 85 C A1080 B High Temperature Operating Life 85 C Vibration Variable Frequency Mechanical Shock Please contact Vincotech for detailed information 9 3 Production Test Each module is electrically tested prior to packing and shipping to ensure state of the art GPS receiver performance and accuracy V4 2 Jul 09 User s Manual Page 22 of 31 Wincotech 10 Applications and Hints 10 1 Minimum Configuration Please refer to chapter 3 1 Minimum Configuration for details In addition for opti mized start up behavior it is strongly recommended to add a batter
18. s The GPS receiver modules A1080 A B are sensitive to electrostatic discharge ESD Please handle with appropriate care V4 2 Jul 09 User s Manual Page of 31 Wincotech 2 Ordering Information 2 1 GPS Receivers A1080 The order number is built as follows e V23993A1080A xxx V23993A1080B xxx V23993 stands for Vincotech s wireless and communication products A1080A for the A1080 A module A1080B for the A1080 B module The xxx reflects the cur rent firmware version If no firmware version is noted in an order the latest version will be provided 2 2 Packing of the A1080 The A1080 A B GPS modules come in a tape and reel package suitable for pick and place machines A o ch TEL Tso DO sor L 10xP0 40 0 2 gt A PO Figure 2 A1080 tape specifications 1 V4 2 Jul 09 User s Manual Page 8 of 31 Woacotect Figure 3 A1080 tape specifications 2 2 3 Additional Equipment Evaluation Kit including one module V23993A1080A Table 3 Additional equipment A detailed description of the additional kit can be found in the according manuals Note There is no specific evaluation kit for the A1080 B as evaluation kits are de signed for demonstration purposes and testing The GPS parameters for both mod ules are identical V4 2 Jul 09 User s Manual Page 9 of 31 Waegptsch 3 Quick Start In order to allow an easy an
19. s Component Side A1080 cc cecccecceeeseeseeeeeeseeeeeeseeseeeeeesseseeseeees 12 4 2 REEL nentes SupUY DOS edd CURED 13 D PIDnsoBHt INTONMAUION eegene 14 5 1 Layout A1080 HW revision UA 14 5 2 Description A1080 Signals HW revision DA 15 e RENE IR e le a 16 6 Electrical Characteristics ccccssscsessecessecesseceeseensecesseeeaseneaseseaseneaseneasenens 17 6 1 Operating hei Lal de E 17 D Z ADSOIUS EK gll AN Siususaoseeons caress tcsesasedssonaredupecanaasseraseassonaredeessosadeserazes 17 5 9 DC Electrical CharactetISllCS ER 18 rael te 19 l 1 Proposed Footprint Torf Soldering asspsesos quss NeaM tu DINE NUPUINFUME UNI R D trud PRIUS 19 7 2 Recommended Profile for Reflow Soldering cccceecceecceeeeeeeaeeeeeeeeeeseeees 19 8 Use of PLC IN event canteen EET 20 ox Eelere lu OF Ii SIONA E 20 Da CUM DEBT EE 21 9 Quality and RIIT lt EE 22 9 4 Environmental SON GUION CN 22 Be ee Meet OM WEE 22 9 9 eie Heite Lut LE 22 10 Applications and FANN EC 23 10 1 Minimumi CORI CU At OM esq ptt EEEE EEEE EEEE 23 10 2 Antenna Status Adaptation WE 23 V4 2 Jul 09 User s Manual Page 4 of 31 Waegptsch 10 2 1 Antenna Gensor IHR e me emen eme ire eese iret re ere eres e renis 23 10 2 2 Antenna Sensor with Current Lmter He 24 10 3 VANT Pin antenna voltage input om 25 10 4 1PPS pin 1 pulse per second om 25 defteg cde MM 26 10 5 1 internal ee RT
20. so allows for accurate timing due to the synchronized atomic clocks in the GPS satellites While the current date and time is transmitted in NMEA sentences UTC an exact and accurate timing signal is pro vided via the 1PPS pin of the A1080 GPS receiver Under good signal conditions the 1PPS signal comes between 620ns and 710ns after the full GPS system second which is accurately around 10ns synchronized to UTC Therefore the 1 second clock can be derived and maintained within around 90ns under good signal conditions Note The 1PPS clock accuracy directly depends on the position accuracy The GPS signals travel at the speed of light therefore a position inaccuracy directly translates into 1PPS inaccuracies 10m position deviation 33ns 1PPS deviation typically 100m position deviation 333ns 1PPS deviation typically The NMEA messages containing absolute timing information UTC time are pro vided around 300ms after the 1PPS signal typically This may change with the GPS receiver setup The 1PPS signal is provided on a as is basis with no accuracy specification The given values are based on a 10 satellite static GPS simulator scenario V4 2 Jul 09 User s Manual Page 25 of 31 Wincotech 10 5 Reset Signal The nRST pin is an input pin The nRST pin can be used to generate a reset on the A1080 A B module Reset ting the module will result in a restart of the complete firmware All information stored in SRAM will sti
21. to GROUND connect z antenna shield see below Antenna signal Z 50 Ohm Re Reewed lmveopen O O Table 4 Pin description A1080 Note Pins marked in yellow are new compared to HW revision 01 to support Push To Fix and ON OFF functionality These pins have been described as Reserved leave open in earlier manual versions If this was obeyed the new assignments will have no impact on the module s functionality V4 2 Jul 09 User s Manual Page 15 of 31 Woacotech 5 3 General Comments The following comments should be considered for a design with and use of the module e Standard configuration of serial port standard GPS software Serial 0 NMEA 4800 baud 8 data bits no parity 1 stop bit no flow control e Antenna Antenna connected to Antenna Pin Use ground pins pin 18 pin 20 close to the antenna input for RF ground V4 2 Jul 09 User s Manual Page 16 of 31 fA Wincotech 6 Electrical Characteristics 6 1 Operating Conditions Pin Description Min 1 Typical Max 3 Esas tuse 9g Z Standby Current 20A Z IW 3 0V 3 6V Peak Acquisition Current HW rev Ld 04 Tracking Current Kc Table 5 A1080 electrical characteristics Note Conditions marked in yellow are for new HW revision 04 1 Peak acquisition current is characterized by millisecond bursts above average acquisition cur rent 2 Average acquisition
22. y back up circuit see chapter 3 4 10 2 Antenna Status Adaptation This chapter shall give assistance in designing a circuit for detecting if an antenna is connected to the module The information about the antenna status can be de rived from the ANTSTAT signal generated by this circuit The examples use values for components that roughly result in the following ANTSTAT output e Logic low when lant lt 9mA e Logic high when 9mA gt lant 16mA e logic low when lant gt 16mA 10 2 1 Antenna Sensor The following circuit is a proposal on how you can feed an antenna with 3 3V and provide an output for the ANTSTAT pin The value of the components may need an adaptation in the final application For example the input current of the chosen comparator goes into that equation The thresholds defined in this circuit are quite close to the ones described above Their value is determined by resistors R4 R5 and R3 We strongly recommend simulating and testing your realized version before using it In any case it is the responsibility of the designer to test and verify the implemen tation V4 2 Jul 09 User s Manual Page 23 of 31 Wincotech U1 U2 rail to rail single supply Common node on PCB comperator with open drain output Output open drain with pullup R2 High for 8m lt lant 18mA Low for lant lt 9mA or lant gt 18mA Figure 11 Application note Antenna sensor adaptation 10 2 2 Antenna Senso
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