GPS Receivers A1080-A - MT
Contents
1. 23 Figure 12 Application note Antenna sensor adaptation with current limiter 23 Figure 13 Application note Antenna current limiter ssssse 24 Figure 14 Application note External reset circuit ueeeeseeseese 26 Figure 15 Application note Module back up eseeeeeeeeeeeeeeeenee 2f V2 3 07 07 User s Manual Page 31 of 312. Tyco Electronics GPS Receivers A1080 A A description of Tyco Electronics GPS module A1080 A User s Manual Version 2 3 Hardware Revision 01 T Tyee Electronics This page was intentionally left blank Revision History Tyco Electronics Revision History Rev Date Description S 03 23 07 New design adjustments 06 01 07 Correction solder pads size 07 03 07 Minor updates serial port configuration 06 07 07 _ Application note reset pin imm dd y oo V2 3 07 07 User s Manual Page 3 of 31 Disclaimer T Tyco Electronics Disclaimer THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF TYCO ELEC TRONICS CORPORATION POWER SYSTEMS TYCO ELECTRONICS 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 TYCO ELECTRONICS OR ITS AUTHORIZED AGENTS THE INFORMATION IN THIS DOCUMENT IS TO THE BEST OF OUR KNOWLEDGE ENTIRELY CORRECT HOWEVER TYCO ELECTRONICS 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 TYCO ELEC TRONICS THIS DOCUMENT MAY PROVIDE LINKS TO OTHER WORLD WID
3. 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 Page 22 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A T Tyco Electronics U1 U2 rail to rail single supply Common node on PCB comperator with open drain output VCCS33 in 00k ANTSTAT VANT Output open drain with pullup R2 High for 8m lt lant 18mA Low for lant lt 9mA or lant gt 18mA GND Figure 11 Application note Antenna sensor adaptation 10 2 2 Antennas with Different Current Draw incl 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 Ui 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 lt 18mA Low for lant 9mA or lant gt 18mA Figure 12 Application note Antenna sensor adaptation with current limiter V2 3 07 07 User s Manual Page 23 of 31 GPS receiver A1080 A T Tyco Electronics 10 3 VANT
4. Demonstration IIIS tossiscenece se aeeceneccnwecnneausecneedeuenuaccuensneecaaeaveesaencseetenedseneaeensies 28 11 1 Evaluation Kit A1080 A csssesese IH IH Hm m IRR memet 28 12 Related Information eese eene nnne unn nune nane a un 29 j E 07011 T ne ee ee ee E 29 12 2 Related ND OCU ee sesesenereteweteseteusteseteustetieteustesieteustesieueusuetieteustetieteustetiete utet 29 T3 LSU OT TaDI6S uci uere ve Sou o ust ewes Ud uen Or EHE EODEM Nu UENEMUE C NEU UM OUR DUM E Uu EURO UE NONE 31 14 List of Figures e 31 Page 6 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A Tyco Electronics 1 Introduction Tyco Electronics GPS module A1080 A is a highly integrated GPS receiver module that can be used as an SMT component It is capable to receive signals from up to 20 GPS satellites and transferring them into position and timing information that can be read over a serial port This new generation of GPS module combines small size and high end GPS functionality at low power consumption Operable at 3 3V 36mA typ 1fix per second Small form factor of 19 x 16 2 mm 0 75 x 0 64 Cost effective antenna input Single sided SMD component for reflow soldering Tape amp reel packaging The A1080 A GPS receivers are available as off the shelf component 100 tested and shipped in standard tape and reel package 1 1 Label The A1080 A label holds the following info
5. Ev eco ce alee E VE ieee eine nnmnnn nnmnnn nnnm 19 3 1 Connecuon OF IRF SIG All NP 19 OLA IO AMON el cacvessecarcnredeseuraccnteacseueiceseqeteveseceienesceerevercenie ese coruensnearneweeconteaontd 20 9 Quality and Beliabilily eee iot t ione oua tee cece din ce succi ute ne Hie cucse Sousa sc cce sue doen 21 9 1 Environmental Conditions ccccccccccsecseeeeeeeeeteeeeeeceeeeeesseteeeeeeeeeeeeeseeteegeees 21 S2 Trodgcr OUaliliCallolieseseounvar E E A S E UV CFR EE ED 21 Jo PTO IN ToS M P 21 10 Applications and Hints e M 22 10 1 Minimum Configuration ssssesssessricsespressorspsrssscup esanaren ana a eenaa nnns 22 10 2 Antenna Status Adaptation ccsinterszaceteessscoteancacensensstadeoniscsieansaceteunadstsonnrasisanand 22 V2 3 07 07 User s Manual Page 5 of 31 Tyco Electronics Table of content T Tyco Electronics 10 2 1 Antennas with Different Current Draw eeeem Hmmm 22 10 2 2 Antennas with Different Current Draw incl Current Limiter 23 10 3 VANT Pin antenna voltage input pin cece cece eeeceeeeeeeaeeeeeeeeeeeeeeseeeaes 24 10 4 1PPS pin 1 pulse per second PIN c cece cece eee seeceeeeeeeseceeeaeeteeeeeseeeeeeeeeees 25 VOLS FROSGCE SIG IVAN a TE E 25 10 5 1 Reset Sources occas cistron cee vanneunacwanaeeduaossbueesencnseneeaesoatsenansipsaddaseeawertvcertadstanasatwesut 25 NOG BASE ACU e NENNEN UU 2 11
6. Jg gll ona ISOUIDI HOD er ene 10 S GUIGK SIBEL ite iis Crede ne ee ee MEUS UN NM SERE ER eee 11 3 1 Minimumi COMM UNATION sss concutit snnt aos Rea S teg UD ANERE dE Ren 11 PLANO AO eoe eesc tereti EE FUP POUS Fe picea UNE repere RI E E 12 S EGET a2 PON SEUNG NETTO 12 S IMProved DEP srren ee abr bbubPUME Pa ppEHoEbubpIAMPIaDuiME PP bu 12 4 Mechanical OUTE 13 4 1 Details Component Side A1080 A ccc cccceeceeeseeeeeeeeeeeeeeeeseeeeeaeeeeeeeeees 13 4 2 Details Solder Side A1080 A seeseeseesseseeenennnemenemnennnn nennen nnns 14 ea nlareisidieignr i me 15 D1 AVOUT A OG OFA em 15 5 2 Description ATOGO A SIGN ANS scesseocesesrconsctensonnceenconeteencenceesrcanideenensienntecesenyeen 15 9x9 Generar COMMONS snaserasesatartncnstansacsodundacsadatancnesansacsadandnonadanonenedanoarsadunancsadaned 16 b Elecirical CIaraclerisli6S saiecassccsccasceswconacescaesunecsnsasesesesueenusasaeenseusaeesnsecasescaess 17 6 1 Operating Conditions lseessessesssesseeeeenn nennen nnne nnn nnne 17 6 2 Absolute maximum ratings eeseessesssssesseeneennenn nennen nnn 17 veut UU E E E 18 7 1 Proposed Footprint for Soldering c cece eeceeeceeeseeceeeeeeeeeteeeseeeeeeeeeeeeeeeeeeees 18 7 2 Recommended Profile for Reflow Soldering eseeeseessse 18 8 Use of AnIGBI iscsi etree cea te ete eee queda wes eru
7. 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 through the VANT pin Page 20 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A Tyco Electronics 9 Quality and Reliability 9 1 Environmental Conditions Operating temperature 30 85 C Operating humidity Max 85 r H non condensing at 85 C MSL JEDEC 3 Moisture Sensitivity Level 6 months in original package Table 8 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 Temperature Humidity Bias 70 C 85 RH Hi
8. E WEB SITES OR RESOURCES BECAUSE TYCO ELECTRONICS HAS NO CONTROL OVER SUCH SITES AND RESOURCES TYCO ELECTRONICS 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 TYCO ELECTRONICS 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 TYCO ELECTRONICS RESERVES THE RIGHT TO CHANGE MODIFY OR IMPROVE THIS DOCUMENT OR THE PRODUCT DESCRIBED HEREIN AS SEEN FIT BY TYCO ELECTRONICS WITHOUT FURTHER NOTICE Page 4 of 31 User s Manual V2 3 07 07 Table of Content Table of Contents 1 Introduction ier EDD 7 lec LENO T 4 2 Characteristics eee 8 quz CES ClialactellsllOS sacs EE E EEE E EE 8 1 2 2 Mechanical CharacteristiCs cccccccccceccceeeseeeseeeeeeeeteeteceeeeseeeneeeueeeeteeetseeeneenaes 8 To NANI TC A ONS E EMT 8 2 Ordering Information me 9 2 GPS Receiver A T0900 issanessescaenssdussex quis Amex a EEEE GRUT DS ERU UR 9 De rr ei IR ro NEP TROU 9 2 2 1 Packaging of the A1080 A ssesssssssssseseseeenennnen nennen nennen nnn nnne nnne nnne nnns 9 2 9
9. Page 8 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A Tyco Electronics 2 Ordering Information 2 1 GPS Receiver A1080 A The order number is built as follows e V23993A1080A V23993 stands for Tyco Electronics wireless and communication products A1080A for the A1080 A module 2 2 Packing 2 2 1 Packaging of the A1080 A The A1080 A GPS module comes in a tape and reel package suitable for pick and place machines A dL 1 5 0 1 DO 10xPO 40 0 2 r A 1s 75 25 Figure 2 A1080 A tape specifications 1 V2 3 07 07 User s Manual Page 9 of 31 GPS receiver A1080 A T Tyco Electronics Figure 3 A1080 A tape specifications 2 2 3 Additional Equipment V23993EVA1080A Evaluation Kit including one module V23993A1080A Table 3 Additional equipment A detailed description of the additional kit can be found in the according manuals Page 10 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A Tyco Electronics 3 Quick Start In order to allow an easy and quick start with the modules A1080 A 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 m
10. 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 GPS receiver module This should be avoided by using an antenna current limiter Please find proposal for simple current limiter below 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 The little schematics below work for Vcc from 3V to 5V The antenna current will be limited to around 50mA v50 4E dE amp E BC858C Q6 BC858C VANT ENABLE GND GND Figure 13 Application note Antenna current limiter Page 24 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A Tyco Electronics 10 4 1PPS pin 1 pulse per second pin The 1PPS pin is an output pin In addition to precise positioning GPS also 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 an exact and accurate timing signal is provided via the 1PPS pin of the A1080 modules 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 module Resetting the module will result in a restart of the complete firmwa
11. d be considered as a starting point for further optimi zation Page 18 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A f T El yco Electronics 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 demonstrated in the drawing 2 rj CNS wy CNOwWy CIND Uy Vias to Solder pads Vias to Top layer GND layer Solder pads Figure 9 Antenna connector strip line A1080 A 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 9090 strip line GPS Module H Motherboard 0 8mm AntGND Figure 10 Strip line parameters A1080 A 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 V2 3 07 07 User s Manual Page 19 of 31 GPS receiver A1080 A T Tyco Electronics
12. ectronics Page 28 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A Tyco Electronics 12 Related Information 12 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 TYCO Electronics Power Systems in Munich Germany for further improve ments are highly appreciated Hans Wiedemann Product Marketing Manager Positioning Products Tel 49 89 6089 838 Fax 49 89 6089 835 Tyco Electronics Corporation Power Systems Finsinger Feld 1 85521 Ottobrunn Germany Email to gos tycoelectronics com Please visit our website at www tycoelectronics com gps 12 2 Related Documents Manual T E GPS Firmware A1080 A TYCO Manual T E GPS EvaluationKit EVA1080 A TYCO Application note GPS AN A1080 A EDLC as Backup Supply V1 0 Application note GPS AN A1080 A Backup V1 0 V2 3 07 07 User s Manual Page 29 of 31 GPS receiver A1080 A T Tyco Electronics Page 30 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A Tyco Electronics 13 List of Tables Table 1 A1080 GPS characteristics s issirocricosssnascanoonn insisi catodar nisni ennai 8 Table 2 A1080 A dimensions and weight eeeeeeesseeeeneeennn 8 Table 3 Additional equipment seeseeseeseen nnne 10 Table 4 Pin descripti
13. er A1080 A T Tyco Electronics 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 Page 16 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A Tyco Electronics 6 Electrical Characteristics 6 1 Operating Conditions Pin Description Min Typical Max 3 Yo BM 36V Standby Current 1 4 204A SOS MET 3 0V 3 3V 3 6V Peak Acquisition Current Average Acquisition Current Tracking Current Table 5 A1080 electrical characteristics 1 Peak acquisition current is characterized by millisecond bursts above average acquisition cur rent 2 Average 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 A Min st absolute sum of all input currents during overload condition storage temperature 5 antenna supply voltage antenna supply current Table 6 Absolute maximum ratings Stresses beyond those listed under Absolu
14. gh Low Temperature Operating 30 85 C High Temperature Operating Life 85 C Vibration Variable Frequency Mechanical Shock Please contact Tyco Electronics 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 V2 3 07 07 User s Manual Page 21 of 31 GPS receiver A1080 A T Tyco Electronics 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 battery 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 lt 16mA e logic low when lant gt 16mA 10 2 1 Antennas with Different Current Draw 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 comperator goes into that equation
15. iver A1080 A T Tyco Electronics 4 2 Details Solder Side A1080 A 1 37 1 37 16 24 0 47 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 A 13 50 Page 14 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A Tyco Electronics 5 Pin out Information 5 1 Layout A1080 A GND VANT Vcc Res Vbak GNDANT 1PPS ANT RX1 GNDANT TX1 Res TXO Res RXO Res nRST Res Res Res BOOTSEL Res Figure 7 Pin out information A1080 A 5 2 Description A1080 A Signals Pin Symbol Description O 1PPS pulse per second output 6 TX1 jSeriloutput 1 reserved for binary out leave open Serial output 0 NMEA out 8 RXO JSerainpttOo NMEAin O 9 nRST jJResetinut y O 10 Res 1 jReseved leaveopen 1 O 12 Res jReserved leave open 13 Res 1 JReservd leaveopen 0 0 0 O 14 Res JResered leaveopen 0 O 15 Res gResevwed leaveopen 1 O 16 Res 1 JJReseved leaveopen 0 y O 17 Res 1 jReseved leaveopen 1 O antenna shield see below 2 Reserved leave open Res Power supply antenna provide according voltage Table 4 Pin description A1080 A V2 3 07 07 User s Manual Page 15 of 31 GPS receiv
16. n 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 when no system power is available If the system or the GPS receiver alone should not be backed up it is possible to support the restart procedure by providing position and date time information to the module This is described in the firmware manual Please refer there to chapter Start up Support in the document T E GPS Firmware A1080 Page 12 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A 4 Mechanical Outline 4 1 Details Component Side A1080 A 18 24 64 14 47 57 13 20 52 11 93 47 10 66 42 9 39 37 8 12 32 6 85 27 5 58 22 4 31 17 3 04 12 1 77 07 0 00 00 V2 3 07 07 Tyco Electronics 14 47 57 k 13 20 52 11 93 47 10 66 42 9 30 37 8 12 32 6 85 27 5 58 22 4 31 17 3 04 12 k 1 77 07 0 00 00 19 05 75 All dimensions in mm inch Figure 5 Mechanical outline component side A1080 A User s Manual Page 13 of 31 GPS rece
17. odule A1080 A VANT lt for 3 3V active antenna W3 lt gt l Fin er Fin ct 5 amp 4 m ntenna AMT 33 input Snohm strip line Reese Qul pul Oo gt e esp WT EE mme E ais M epp M m m Vbak amp Gu NSEO310 8 h BT 7 Bal i ery F1 T oND lt gt C iB ua X EE CEDE RA Backup Suooly lol ions DA Supercap charged through GPS module E Primary cell decaounled nith diode Figure 4 Recommended minimum configuration A1080 A 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 A battery back up circuit for the RTC Real Time Clock should be consid ered see 10 6 V2 3 07 07 User s Manual Page 11 of 31 GPS receiver A1080 A T Tyco Electronics Battery Back up NOTE Please make sure that the A1080 A is either within an enclosure or addi tionally shielded to reduce the influence of temperature fluctuations often generated by airflow 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 a
18. on A1080 A 1eeeseesesseeeeernnnnnnnnennnnn nnne 15 Table 5 A1080 electrical characteristics cc cceccecc eee eeceeeeeeeeeeeeseeseeeeeseeseeeeeees 17 Table 6 Absolute maximum ratings ccceccecceeceeceeceeeeeeeeeeeeseesecseeseeseeseeseeseeeees 17 Table 7 Reflow soldering profile A1080 A eeeeeeeeeeeeereeenerne 18 Table 8 Environmental conditions eseeseeseeseeeenn nne 21 14 List of Figures FOUE TATOO OA AIDE fot en ene ee ee T Figure 2 A1080 A tape specifications 1 cccccccceccseecseeeeeeeeeese esse eeseeeeeeseeeseeeaes 9 Figure 3 A1080 A tape specifications 2 sseseeeseesseeeeeeeeernenne 10 Figure 4 Recommended minimum configuration A1080 A s 11 Figure 5 Mechanical outline component side A1080 A seseeeseeese 13 Figure 6 Mechanical outline solder side A1080 A eeseeeeeeeeeeeeeee 14 Figure 7 Pin out information A1080 A sssessessseeseennnennee nnne 15 Figure 8 Soldering footprint proposal A1080 A ccc cecceccsecceeeeeeeeeteeeeeenseeeeeaeees 18 Figure 9 Antenna connector strip line A1080 A eeeeeeeeeeeeneeereeeee 19 Figure 10 Strip line parameters A1080 A cccccecccccseeceeeeeeeeeeeeeeeeeeeeeeeseeeeeeaeees 19 Figure 11 Application note Antenna sensor adaptation
19. re All information stored in SRAM will still be valid 10 5 1 Reset Sources 10 5 1 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 V2 3 07 07 User s Manual Page 25 of 31 GPS receiver A1080 A T Tyco Electronics 10 5 1 2 External reset circuit If for some reasons an external reset input is really desired the use is subject to following restrictions 1 Never ever connect a capacitor of any size to the nRESET pin 2 Never ever pull the nRESET pin actively high 3 Only use an open drain collector device e g a bipolar NPN transistor to ground see Fig 1 to pull the nRESET pin low in order to issue a reset 4 Make sure that the nRESET pulse is absolutely glitch free with sharp edges and lasts at least 100ms GND VUL lt _ gt VEC VBAK IPPS FXE TXE TXA NMEs nRESET BOOTSEL T GPS Receiver F FESE j qo WS NPN nRESEI lou activae RESET high active LND Figure 14 Application note External reset circuit Page 26 of 31 User s Manual V2 3 07 07 GPS receiver A1080 A Tyco Electronics 10 6 Battery Back up This application note describes on how to back up the RTC and
20. rmation Hardware rr Hardware Ausgabe Hardware Release Software t4 Software Release sss Software Version Datecode and Location BZ Munich YK Bicske ww Woche week yy Jahr Year Figure 1 A1080 A label V2 3 07 07 User s Manual Page of 31 f GPS receiver A1080 A Tyco Electronics 1 2 Characteristics The modules are characterized by the following parameters 1 2 1 GPS Characteristics Channels 20 paraleltrackng Correlators o A j20000pus Frequency L1 s1575MH 9 Tracking Sensitivity 159dBm Time To First Fix TTFF 0 1s theoretical minimum values values in real world may differ Table 1 A1080 GPS characteristics 1 The calibrated clock of the receiver has not stopped thus it knows precise time to the us level 2 The receiver has estimates of time date position and valid almanac and ephemeris data 3 The receiver has estimates of time date position and recent almanac 4 The receiver has no estimate of time date position and no recent almanac 1 2 2 Mechanical Characteristics A1080 A Mechanical dimen Length 19mm 0 75 sions Width 16 2mm 0 64 M 2 4mm 0 095 A1080 AWeight 19g 0 05oz Table 2 A1080 A dimensions and weight 1 3 Handling Precautions The GPS receiver module A1080 A is sensitive to electrostatic discharge ESD Please handle with appropriate care
21. te 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 V2 3 07 07 User s Manual Page 17 of 31 GPS receiver A1080 A T Tyco Electronics 7 Mounting This chapter covers the mounting of the A1080 A 7 1 Proposed Footprint for Soldering The following proposal of a footprint for soldering is assuming a stencil thickness of 150um X marks the center of the through holes 03 Solder paste Figure 8 Soldering footprint proposal A1080 A 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 Time within 5 C of actual peak temperature 10 20 seconds Ramp Down rate 6 C second max Time 25 C to peak temperature Table 7 Reflow soldering profile A1080 A 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 shoul
22. 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 supercap While the supercap is charged thru the module during normal operation the bat tery primary cell is decoupled thru a diode Di Vbak Vbak lt K NSK01 330 Supercap Battery GND GND Backup Supply Options A Supercap charged through GPS module B Primary cell decoupled with diode Figure 15 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 V2 3 07 07 User s Manual Page 27 of 31 GPS receiver A1080 A T Tyco Electronics 11 Demonstration Kits 11 1 Evaluation Kit A1080 A For demonstration and easy evaluation of GPS performance Tyco Electronics offers a Demonstration Kit including one GPS A1080 A module It contains a USB inter face with according drivers to connect easily to a PC The USB interface is an ex tension 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 C MOS level via a terminal plug For further information please contact Tyco El
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