GPS Receiver A1084
Contents
1. Feb 09 User s Manual Page 31 of 34 Vincotech 11 Evaluation Kit EVA1084 A For demonstration and easy evaluation of GPS performance Vincotech offers an evaluation kit including one GPS A1084 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 provides NMEA messages on CMOS level via a terminal plug Figure 16 Evaluation kit EVA1084 A For further information please contact Vincotech V1 0 Feb 09 User s Manual Page 32 of 34 Wincotech 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 Inputs regarding errors or mistaken verbalizations and comments or proposals to Vincotech Germany for further improvements are highly appreciated Vincotech GmbH Biberger Str 93 82008 Unterhaching Munich Germany Tel 49 89 8780 67 O Fax 49 89 8780 67 351 gps vincotech com www vincotech com gps 12 2 Related Documents GPS Firmware A1080 Vincotech GPS Evaluation Kit EVA1084 A Vincotech SIRF_Binary_Reference_Manual SIRF SIRF NMEA Reference Manual SIRF GPS AppNote nRST A12. by vias as demonstrated in the drawing Top view Motherboard Bottom Layer Motherboard Top Layer MUU UU 71 UU UU II Ed OO GPS Receiver Top view GPS Receiver QO Ge LL UU HU UU NE O Vias to Top Layer vias to GND Layer GPS Receiver solder pads Figure 9 Antenna connector strip line A1084 V1 0 Feb 09 User s Manual Page 21 of 34 Woacotech In order to achieve the impedance of 50 Q the width of the strip line needs to be calculated 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 ma terial is FR4 50Q strip line GPS Module H r Motherboard 0 8mm AntGND Figure 10 Strip line parameters A1084 In this case the width should be about 1 8 times the height of the PCB W 1 8xH In the example one would get a width of W 1 8 x 0 8 mm 1 44 mm 8 2 Antenna Connections 8 2 1 Active Antennas 8 2 1 1 On External Active Antenna Input ANT_EXT General GPS active antenna specification Limitations e Supply voltage voltage fed into VANT pin 5V max e Supply current 50mA max Recommendations e Gain 2 20dB should not exceed 26dB cable loss 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 sensi
3. 0 Feb 09 User s Manual Wiacotech 2 Ordering Information 2 1 GPS Receivers A1084 The order number is built as follows e V23993A1084A xxx V23993A1084B xxx V23993 stands for Vincotech s wireless and communication products A1084A for the A1084 A module A1084B for the A1084 B module The xxx refers to the cur rent firmware version on the module If no firmware version is referenced in an or der the latest version will be provided 2 2 Packing of the A1084 The A1084 A B GPS modules come in a tape and reel package suitable for pick and place machines ab LU L3 000000000000 P2 mso LI z 2 mi m GI 5 0 gt fe P A i 4 40 1 10xP0 40 0 3 Figure 2 A1084 tape specifications 1 Page 8 of 34 Wincotech A A 0 3 10 Figure 3 A1084 tape specifications 2 Figure 4 A1084 tape specifications 3 One complete reel holds 800 A1084 modules One box holds three reels V1 0 Feb 09 User s Manual Page 9 of 34 Wiseotech 2 3 Additional Equipment V23993EVA1084A Evaluation Kit including one module V23993A1084A Table 3 Additional equipment A detailed description of the EVA1084 A Evaluation Kit can be found in the appro priate manual Note There is no specific evaluation kit for the A1084 B distinct from the evalua tion kit for the A1084 A as evaluation kits are designed for demonstration purposes and testing The GPS parameters for both modules are
4. 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 UTC an exact and accurate timing signal is pro vided via the 1PPS pin of the A1084 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 10 m position deviation 33 ns 1PPS deviation typically 100 m position deviation 333 ns 1PPS deviation typically The NMEA messages containing absolute timing information UTC time are pro vided around 300 ms after the 1PPS signal typically This may change according to the setup of the GPS receiver The 1PPS signal is provided on an as is basis with no accuracy specification The given values are based on a 10 satellite static GPS simulator scenario V1 0 Feb 09 User s Manual Page 28 of 34 Wincotech 10 5 Reset Signal The nRST pin is an input pin The nRST pin can be used to generate a reset on the A1084 A B
5. Footprint for Soldering Following soldering footprint parameters are recommended Copper and solder paste footprint are identical Pad shape size inner pads 1 5mm x 1 5mm Pad shape size outer pads 1 0mm x 0 8mm Stencil thickness of 120 150um 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 Average ramp up rate to Peak 183 C to Peak 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 8 Reflow soldering profile A1084 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 V1 0 Feb 09 User s Manual Page 20 of 34 Wincotech 8 Use of GPS Antennas 8 1 Connecting a GPS antenna to the GPS receiver The ANT EXT or ANT INT pin is used to connect a GPS antenna to the receiver The design of the antenna connection has to be done strictly according to RF de sign rules A 5002 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 Addition ally antenna ground ANT GND should be routed to the ground plane of the PCB the ground plane is on a lower PCB layer
6. identical V1 0 Feb 09 User s Manual Page 10 of 34 Wincotech 3 Quick Start In order to allow an easy and quick start with the A1084 A and A1084 B modules this chapter provides a short overview on the important steps to be taken 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 A1084 A and B VANT lt gt 3 3 V Active Antenna 3V3 lt _ gt lt gt GPS Receiver 500hm RF Termination Antenna Input a RS232 output GND GND AF Ao GND a d e D Beet ex Sia Wek og EE AE dn KNE eee ee OF SS RR E I i LA ER 3 aii gt Vbak Vbak lt j voak ale MAX3232 Selen RS232 Level Shifter SIF 8 nee NOT I g fa ss e g P1 na Battery GND lt gt GND GND i l GND B JE JE GND Backup Supply Options A Supercap charged through GPS module B Primary cell decoupled with diode REMARKS Place C1 to C5 close to MAX3232 For cap values see datasheet of actual component used Use 3 3Volt level shifer MAX3232 or equiv e Place C1 to C5 here 0 1uF close to MAX3232 For capacity values see datasheet of actual component used Use 3 3V level shifter MAX3232 or equivalent Use separate ground pl
7. module Reset ting the module will result in a restart of the complete firmware All information stored in SRAM will still be valid 10 5 1 Internal Reset Circuit The A1084 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 lf for some reasons an external reset input is really desired the following in structions are recommended Only use an open drain collector device e g a bipolar NPN transistor to ground see below to pull the nRST pin low in order to issue a reset NRESET RESETS nRESET low active RESET high active Figure 14 Application note Recommended external reset circuit V1 0 Feb 09 User s Manual Page 29 of 34 Woacotech 10 6 Battery Back up This application note describes how to back up the RTC and the SRAM of the GPS receiver module The basics of the first example addresses providing a back up power supply by using 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 E D1 Vbek Vbek lt lt _ NSRO130 Q Sole D O E Battery mp
8. 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 A absolute sum of all input currents during overload condition Vant antennasupplyvolage 1015 lant antenna supply current 10150 mA Table 6 Absolute maximum ratings input current on any pin t 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 V1 0 Feb 09 User s Manual Page 18 of 34 Uf Wincotech 6 3 DC Electrical Characteristics Symbol Cd Parameter Min Max Unit GPIO 0 OV IMN JO8 PV NRST l forsafereset 1 102 OV i 03810361 V BOOTSEL Vih 2 3 Vcc V ANT SW In 20 v oo MM JO2P VE Table 7 DC electrical characteristic V1 0 Feb 09 User s Manual Page 19 of 34 Vincotech 7 Mounting This chapter describes the suggested mounting process for the A1084 A and A1084 B receiver modules In a ROHS compliant product with a ROHS compliant process it is recommended to use chemical tin as the counter part to the modules pins This will guarantee highest resistance against shocks 7 1 Proposed
9. 080 Vincotech GPS AppNote 1PPS Pulse Width Vincotech GPS AppNote EDLC Backup A1080 Vincotech GPS AppNote Backup A1080 Vincotech GPS AppNote GeoHelix Antenna A1080 Vincotech GPS AppNote Firmware A1080 Vincotech 12 3 Related Tools e GPS Cockpit Vincotech e SIRF Demo SIRF e SIRF Flash SIRF V1 0 Feb 09 User s Manual Page 33 of 34 Wincotech 13 List of Figures gle 10 o WE 6 Figure 2 A1084 tape Specifications Il 8 Figure 3 A1084 tape specifications 7 9 Figure 4 A1084 tape specifications 3 9 Figure 5 Recommended minimum configuration A1084 rrrrarnnnrnnrrnnrrnnnennnnnnnn 11 Figure 6 Mechanical outline component side ATOSA ADR 13 Figure 7 Mechanical outline solder side ATIUSA 14 Figure 8 Pin out information bottom view A1084 rrrrrrarrrarerarrrarnnrrnarrnanenannnnnn 15 Figure 9 Antenna connector strip line A1084 rarrarrnnrnarrnernarnnrrnarnnnnnernannnnrnennnnn 21 Figure 10 Strip line parameters ATIUISA 22 Figure 11 Antenna supply voltage for ANT INTE 23 Figure 12 Application note Antenna sensor adaptaton 2 Figure 13 Application note Antenna sensor adaptation with current limiter 2 Figure 14 Application note Recommended external reset cru 29 Figure 15 Application note Module back up 30 Figure 16 Evaluation kit EVATIOGAA 32 14 List of Tables Table 1 A1084 GPS characteristics rrrrrrarrnrrnnrranrnrrrarnnnrrnrnannnernannnannneneennneneennsenn T T
10. A mp ei D Backup Supply Options A Supercap charged through GPS module CE 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 Vbat pin Care needs to be taken that there is no voltage outage during the switch over phase The Vbak pin draws 20 pA typically V1 0 Feb 09 User s Manual Page 30 of 34 Wnenteck 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 appropriate manual paying particular attention to the paragraph titled Set TricklePower Parameters In order to request a fix outside the specified duty cycles it is necessary 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 A1084 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 20 pA typically and maintains RTC and SRAM V1 0
11. MONG 20 7 1 Proposed Footprint for Soldering ccccccecseeceeeseeceeeeeeseeteeeeeeteeeeeeseeteenaees 20 7 2 Recommended Profile for Reflow Soldering rrrnrrranenannnannnarnnnrnnnennnnnnnnnnnn 20 8 Use of GPS Antennas i vauvaunannannunnunnunnnnnnnunnunnnnnnnunnunnnnnnnnnnunnunnnnnnnunnunnunnnnnnnunnun 21 8 1 Connecting a GPS antenna to the GPS receiver rrnrrrrrrarerrrrarvnrrrarrnrenernnnnn 21 8 2 Antenna Connechons nrin nnr rrr nr nerne nn rne 22 FEN EE C e EEE 22 8 2 2 Passive Antennae reran ternene r nrar A rnnr A rrn A nEn E Annne Ennen nenne 24 OZAN ae E EE E E E eee 24 9 Quality and RUN ADO NIU E 25 9 1 Environmental Conditions 25 9 2 Product Qualification cece ceccececeeceeeeeeeeeseeeeseeeeeeeeeeaeeeeaeseeaeeeeneeeeeeeaeneners 25 9 9 Producton TeSt eseme ne ae ee ee aE 25 V1 0 Feb 09 User s Manual Page 4 of 34 Wiacetect 10 Applications and e ln EC 26 10 1 Minimum C ONMOQUI ANON WEE 26 10 2 Antenna Status Adaptation cccccccccecceccsseceeeeeeseeeeeeeseceeeeeeeeeeeeseeseeeeeees 26 10 2 1 Antenna SNS Ol orate teres sce ence cence ed 26 10 2 2 Antenna Sensor with Current LIMMtED 0 eee eec eee eceeeeceeeeseeeeseeeeseeneeeeaneeeneeens 27 10 3 VANT Pin antenna voltage input om 28 10 4 1PPS Pin 1 pulse per second om 28 SR NN sisieas ora a EE E E E E E EEE E EE EEE 29 10 5 1 Internal Reset e E 29 152 Pei 29 1026 Bal ely ACK UD E 30 10 7 bRusb io FEtvMode cece cccecececec
12. R 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 V1 0 Feb 09 User s Manual Page 3 of 34 Wincotech Table of Contents BR La Lil gode UT ee EEE 6 VIE DEN 6 we e Ee T e WE E ee de EE T 1 2 2 Mechanical Characernsuds unavsivuausedvgmmmmsemersaiieambnseddeemrm innan T ce Flute luet CEA E T 2 Ordern TOMI QUO an 8 2 1 GPS RENN Ne 8 PN 8 25 FOTEN EE 10 JOKER 11 TFT TINN 11 WEE E SE 12 SAP SN NA 12 Or IOP OVC 8 EEE 12 4 Mechanical Outline Lee 13 4 1 Details Component Side A1084 rrrarvnrrrnrnarenernarnnrenarnnnenernnnnnernusnnnenernnnnnernnsnnn 13 4 2 Details Solder Side A1084 00 eee ccc eceeeeeeeeeeeeeeeeeeeeaeeeneseeeeeeeeaeneneneeess 14 5 Pin out InformatiOn avaunavnununannununannununnnnununnununnnnunununnununnnnununnnnunvnnnnununnnnununnen 15 SC ENEE 15 IL IDE SCID HOM TAL SIG INNS EE 16 5 3 General Gs AEE EEE 17 6 Electrical Characteristics anrannannannnnnunnunnnnannnnnunnunnnnnnnunnunnunnnnnnnunnunnunnnnnnnunnunnn 18 6 1 Operating LO 0 die E 18 6 2 Absolute E dall ne EE 18 6 3 DC Electrical Ee Ter e 19
13. Table 4 Pin description A1084 Note 1 In the event that an active antenna is connected to pin 12 ANT INT the antenna supply voltage has to be fed separately see chapter 8 2 1 2 On Internal Passive Antenna Input Note 2 An active antenna connected to pin 12 ANT_INT must not exceed a gain of 10dB antenna cable loss according to SIRF recommendation see chapter 8 2 1 2 On Internal Passive Antenna Input 5 3 General Comments The following comments should be considered for a design using either the A1084 A or A1084 B 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 10 pin 13 close to the antenna input for RF ground V1 0 Feb 09 User s Manual Page 17 of 34 Uf Wiacstech 6 Electrical Characteristics 6 1 Operating Conditions Pin Description Min Typical Max Moa oo o O 360 Vbak Standby Current 200A gt 3 0V 3 Ve 3 6V c i 3 3V Peak Acquisition Current JL SMA O Average Acquisition Current NMA TI Tracking Current 26mA Table 5 A1084 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
14. Vi ncotech GPS Receivers A1084 A Description of Vincotech s GPS Receiver Modules A1084 A B User s Manual Version 1 0 Hardware Revision 01 Woacetect Revision History Rev Date Description eee 0 1 08 22 08 Initial Draft 0 2 12 04 08 Second Draft 0 Od 02 1 0 01 26 09 KH mm dd yy V1 0 Feb 09 User s Manual Page 2 of 34 Vincotech 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 VINCOTECH 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 O
15. able 2 A1084 dimensions and weight T 19063 ATA NA e Ile LE EE 10 Table 4 Pin description A1084 rrrnarnarnannanvnnnnnnnnnnnrnnrnennnrnnnnannannasnannannannnnnnnnnnnner 17 Table 5 A1084 electrical Characteristics cccccccsecceecsecceeceeceeeceesueeeeeseesaeenans 18 Table 6 Absolute MAXIMUM ratings 00n0n00n0nnannnnanoanunonnnnoannnrnnenrnrnnrnnrnrnnrnenernne 18 Table 7 DC electrical characteristic n00nonnnnnnnennnnennnnenrnrerrnrsrrnrrrrerrnrerrnrerrnne 19 Table 8 Reflow soldering profile ATIOS A 20 Table 9 Environmental conditions arrarrarranrnnrnnrnnrnernernernarnannannaanaanaannnnnnnnsnnsenee 25 V1 0 Feb 09 User s Manual Page 34 of 34
16. ane for antenna ground External antenna input impedance is 50 Q Match as close as possible Maximum allowed external antenna current is 50mA Consider a current lim iter e A battery back up circuit for the RTC Real Time Clock should be consid ered see chapter 10 6 Battery Back up V1 0 Feb 09 User s Manual Page 11 of 34 Wincotech 3 2 Antennas Both active and passive antennas are supported If an active antenna is used it is recommended to use one with a supply voltage of 3 to 5 VDC and a current draw of 50 mA maximum The quality of the GPS antenna chosen passive or active is of paramount importance for the overall sensitivity of the GPS system For passive antennas connected to pin 12 ANT_INT special care should be taken on providing an according ground plane An active antenna connected to pin 9 ANT_EXT 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 An active antenna connected to pin 12 ANT_INT should follow the recommendations given in chapter 8 2 1 2 On Internal Passive Antenna Input 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 availab
17. ececececececececenenenenenenenenenenenenenenenenenenenenenenens 31 10 8 g 911005 11110 0 EE EE 31 11 Evaluation Kit EVA1084 A eavavnvnavnvnvnavnununnnnununnnnununnnnununnvnununnnnununnnnununnvnunue 32 12 Related Information sssssseccsienicessscecesccsivevencesacsesssswcseninecseenesacsnesvesiweessesiescsscanes 33 VIN 33 12 2 Related Bole Pga EEE 33 12 3 Related RR e e EC 33 13 LISt Of die ln 34 gS OI e TE 34 V1 0 Feb 09 User s Manual Page 5 of 34 Wnenteck 1 Introduction Vincotech s GPS modules A1084 A and A1084 B are highly integrated GPS re ceiver modules that can be used as SMT components They are capable of receiv ing signals from up to 20 GPS satellites and transferring them into position and tim ing information that can be read over a serial port This new generation of GPS modules combines small size and high end GPS functionality at low power con sumption Operable at 3 3V 26mA typ 1fix per second Small form factor of 15 24 x 15 24 mm 0 6 x 0 6 Support of passive and active antennas RF switch for a second GPS antenna only A1084 A On board antenna supply voltage feed Single sided SMT component for reflow soldering Tape amp reel packaging The A1084 receivers are available as off the shelf components 100 tested and shipped in standard tape and reel package 1 1 Label The A1084 A labels hold the following information Hardware rr Hardware Ausgabe Hardware Release Software i es Sof
18. ed antenna inputs V1 0 Feb 09 User s Manual Page 24 of 34 Wincotech 9 Quality and Reliability 9 1 Environmental Conditions Operating temperature 30 C 85 C Operating humidity Max 85 r H non condensing at 85 C MSL JEDEC Moisture Sensitivity Level 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 Temperature Humidity Bias 70 C 85 RH Low High Temperature Operating 30 C 85 C 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 V1 0 Feb 09 User s Manual Page 25 of 34 Wincotech 10 Applications and Hints 10 1 Minimum Configuration Please refer to chapter 3 1 Minimum Configuration for details In addition for op timized start up behavior it is strongly recommended to add a battery back up cir cuit see chapter 10 6 Battery Back up 10 2 Antenna Status Adaptation This chapter shall give ass
19. istance 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 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 the GPS receiver integrated in your product design before implementing the finalized product in the appropriate market application V1 0 Feb 09 User s Manual Page 26 of 34 Woaeetech U1 U2 rail to rail single supply Common node on PCB comperator with open drain output ANTSTAT gt Output open drain with pullup R2 High for Sm lt lant lt 18mA Low for lant lt 9mA or lant gt 18mA Figure 12 Application note Antenna sensor adaptation 10 2 2 Antenna Sensor with Current Limiter This proposal is similar to the first one but i
20. le V1 0 Feb 09 User s Manual Page 12 of 34 Wineotech 4 Mechanical Outline 4 1 Details Component Side A1084 15 24 0 6 15 24 0 6 All dimensions in mm inch Figure 6 Mechanical outline component side A1084 A B V1 0 Feb 09 User s Manual Page 13 of 34 Wincotech 4 2 Details Solder Side A1084 12 7 15 24 PC00000 JO0000000 7 62 solder pad size outer pads 1 0 x 0 8 Solder pad size inner pads 1 5 x 1 5 All dimensions in mm Figure 7 Mechanical outline solder side A1084 V1 0 Feb 09 User s Manual Page 14 of 34 5 Pin out Information 5 1 Layout A1084 Waeptech RXO 22 a 1 nRST TXO 21 21 2 2 BOOTSEL TX4 20 D 3 Vec ON OFF 19 4 4 RFPWUP RX1 18 6 5 GPIO 15 nWAKEUP 17 17 6 GND 1PPS 16 D 7 GND Vbak 15 8 VANT GPIO_0 14 14 9 ANT EXT ANT GND 13 10 ANT GND ANT INT 12 12 1 11 ANT SW Figure 8 Pin out information bottom view A1084 Q pin one marker V1 0 Feb 09 User s Manual Page 15 of 34 Uf Wincotech 5 2 Description A1084 Signals T gg NRST Input Reset input open HIGH no reset LOW reset see 10 5 Reset Signal BOOTSEL Input Special boot mode leave open for normal operation HIGH boot loader active Vcc Power Supply 3 0 3 6 VDC power supply RFPWUP Output Status of analog section LOW OFF HIGH ON GPIO 15 Reserved leave open Power Supply Ground power supply Power Supply Ground po
21. ncludes a current limiter Comments and notes as above apply We strongly recommend simulating and testing the GPS receiver integrated in your product design before implementing the finalized product in the appropriate market ap plication In any case it is the responsibility of the designer to test and verify the implementation Current Limiter U1 U2 rail to rail single supply Common node on PCB comperator with open drain output BCssac Ech PP Output open drain with pullup R2 High for 9m lant lt 18mA Low for lant 9mA or lant gt 18mA Figure 13 Application note Antenna sensor adaptation with current limiter V1 0 Feb 09 User s Manual Page 27 of 34 Wincotech 10 3 VANT Pin antenna voltage input pin The VANT pin is an input pin The supply voltage for an active GPS antenna on the ANT EXT input has to be fed into the Vant pin The easiest way to do that is to connect Vcc to VANT The maxi mum current is 50 mA Note Shortcut between ANT and GND may damage the A1084 A B GPS receiver module This should be avoided by using an antenna current limiter The circuit chapter 10 2 2 Antenna Sensor with Current Limiter works for Vcc from 3V to 5V The antenna current will be limited to 50 mA 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
22. tivity 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 V1 0 Feb 09 User s Manual Page 22 of 34 Wineotech 8 2 1 2 On Internal Passive Antenna Input ANT_INT This schematic is a part of the EVA1084 A Evaluation Kit schematics It shows how an antenna supply voltage can be fed to an active antenna connected to ANT_INT and how the antenna supply voltage can be switched on and off by RFPWUP REFPWOP SW Figure 11 Antenna supply voltage for ANT_INT An active antenna connected to pin 12 ANT_INT must not exceed a gain of 10dB antenna cable loss according to SIRF recommendation Exceeding this gain rec ommendation should be tested case by case V1 0 Feb 09 User s Manual Page 23 of 34 Wiseotech 8 2 2 Passive Antennas A passive antenna connected to ANT_INT should be placed as close as possible to the GPS receiver The signal power lost by the antenna cable or lost by the stripline on the PCB can not be recovered by the LNA Low Noise Amplifier integrated in the GPS receiver A suitable Ground Plane design should be considered depending on the antenna type connected to ANT_INT 8 2 3 Hints Unused antenna inputs should be terminated with 50 Q 20 Do not feed an tenna supply voltage into terminat
23. tware Release sss Software Version Datecode and Location BZ Munich YK Bicske ww Woche week yy Jahr Year Figure 1 A1084 A label The A1084 B s labels show a B instead of the A V1 0 Feb 09 User s Manual Page 6 of 34 Uf Wiacstech 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 1 1 575 MHz Tracking Sensitivity 159 dBm external active antenna Position Accuracy Stand alone lt 10 m CEP SA off Time To First Fix TTFF 0 1 s theoretical minimum values values in real world may differ Table 1 A1084 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 A1084 Mechanical Length 15 24 mm 0 6 dimensions Width 15 24 mm 0 6 2 4 mm 0 095 A1084 Weight Table 2 A1084 dimensions and weight 1 3 Handling Precautions The GPS receiver modules A1084 A B are sensitive to electrostatic discharge ESD Please handle with appropriate care V1 0 Feb 09 User s Manual Page 7 of 34 V1
24. wer supply TER Power supply Power supply antenna provide according voltage up to 5 0 VDC VANT feeds pin 9 ANT EXT ANT EXT Antenna Input Antenna signal Z 50 Ohm external active antenna input version only B version Do not connect tenna shield 11 ANT SW Input Antenna switch LOW or Open internal passive antenna pin12 ANT INT input HIGH external active antenna pin 9 ANT EXT version only B version Do not connect kW ANT_INT Antenna Input Antenna signal Z 50 Ohm internal passive antenna input i and B version see Note 1 2 k ANT_GND RF GND Antenna REE aaa do not connect to GROUND connect to an tenna REE aaa GPIO 0 Output Antenna supply status SIRF chip Antenna supply voltage can be switched off Power Supply Back up pin of module for super cap or battery see below 1PPS Output 1PPS pulse per second output 17 nWAKEUP Output Status of digital section Low ON High OFF Open Drain with internal pull up 100k can not source current 18 Serial input 1 unused in current firmware leave open EI ON OFF Input ON OFF used in PTF mode to request a fix by toggling from LOW to HIGH ON OFF used to switch to hibernate mode and back leave open if not used E TX1 TX1 Output Serial output 1 unused in current firmware leave open ine Output Serial output 0 NMEA out Serial input 0 NMEA in V1 0 Feb 09 User s Manual Page 16 of 34 Wnenteck
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