GPS Receiver A1035-H - MT
Contents
1. Backuo Supply Options CA Supercap charged through GPS module B Primary cell decoupled with diode Figure 18 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 2 May 11 User s Manual Page 33 of 38 maestro GPS receiver 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 For more information see GPS AppNote Firmware GSC3 10 8 Hibernate Mode The two ways as described within this paragraph to send a module into Hibernate Mode should be implemented in order to avoid loss of data which might in rare cases lead to a cold start of the module 10 8 1 Entering Hibernate Mode with ON OFF Pin From firmware version 3 2 5 firmwa2. In the example one would get a width of W 1 8 x 0 8 mm 1 44 mm V1 2 May 11 User s Manual Page 25 of 38 maestro 4 GPS receiver 8 2 External Antenna 8 2 1 Recommended Parameters General GPS active antenna specification Limitations e Supply voltage according to voltage fed into VANT pin 5 V max e Supply current 50 mA max Recommendations e Gain2 20 dB should not exceed 35 dB e Noise figure lt 1 5 dB The recommendations apply to the majority of active antennas that can be found in the market The quality and suitability of the GPS antenna chosen is of paramount importance to 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 V1 2 May 11 User s Manual Page 26 of 38 maestro GPS receiver 8 2 2 Switching External Antenna Supply This schematic is a part of the EVA1035 H Evaluation Kit schematics It shows how the antenna supply voltage can be switched on and off by RFPWUP 33 BOOTSEL REPWUP Sw Figure 14 Switching external antenna supply using RFPWUP 8 2 3 Hints Unused antenna inputs should be terminated with 50 20 Do not feed the antenna supply voltage into terminated antenna inputs V1 2 May 11 User s Manual Page 27 of 38
3. maestro GPS receiver 9 Quality and Reliability 9 1 Environmental Conditions Operating temperature 40 C 185 Operating humidity Max 85 r H non condensing at 85 C MSL JEDEC Moisture Sensitivity Level 6 months in original package Table 6 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 40 C 85 C Temperature Humidity Bias 70 C 85 RH Low High Temperature Operating 40 C 85 C High Temperature Operating Life 85 C Vibration Variable Frequency Mechanical Shock Please contact Maestro 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 2 May 11 User s Manual Page 28 of 38 maestro GPS receiver 10 Application and Hints 10 1 Minimum Configuration Please refer to chapter 3 1 Minimum Configuration for details As outlined there for optimized start up behavior it is strongly recommended to add a battery back up circuit see chapter 10 6 Battery Back up 10 2 External Antenna Status Adaptation This chapter shall give assistance in designing a circuit fo
4. maestro N GPS receiver GPS Receiver A1035 H A Description of Maestro s GPS Receiver Smart Antenna Module A1035 H User s Manual Version 1 2 maestro ei GPS receiver Revision History LO Rev Date Description O 1 0 01 26 09 4 1 02 09 11 1 Correction of additional solder pad information 2 Added nRST information link in signal table comments on boot select added 3 Added chapter on evaluation kit 4 Corrected soldering profile extended temperature range specification with slightly decreased performance below 30 C corrected decreased current draw figures added chapter on antenna supply switch added hint on Ephemeris Push corrected reel and box quantities 5 New label description introduced cw50 09 extended minimum configuration application note on Hibernate Mode extended use of O pin or Shutdown Command 12 05 05 1 1 1 Modify packaging describe mmddyy OO V1 2 May 11 User s Manual Page 2 of 38 maestro GPS receiver Disclaimer THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF MAESTRO WIRELESS SOLUTIONS LIMITED 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 MAESTRO OR ITS AUTHORIZED AGENTS THE INFORMATION IN THIS DOCUMENT IS TO THE BEST OF OUR KNOWLEDGE ENTIRELY CORRECT HOWEVER MAESTRO CAN NEITHER ACCEPT LIABILITY FOR ANY INACCURACIES OR THE CON
5. Open Drain with internal pull up 100k can not source current 17 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 Serial input 1 unused in current firmware leave open Output Serial output 1 unused in current firmware leave open Output Serial output 0 NMEA out Table 4 Pin description A1035 H V1 2 May 11 User s Manual Page 19 of 38 maestro GPS receiver 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 O NMEA 4800 baud 8 data bits no parity 1 stop bit no flow control e External antenna Antenna connected to Antenna Pin Use ground pin 7 close to the antenna input for RF ground V1 2 May 11 User s Manual Page 20 of 38 maestro GPS receiver 6 Electrical Characteristics 6 1 Operating Conditions Pin Description Min Typical I ME Vbak 18V IL 36V Standby Current Zu 3 Vee 1 LAN 33V 36V Peak Acquisition Current 36mA Average Acquisition Current 3MA Tracking Current JL 2MA Table 5 A1035 H electrical characteristics 1 Peak acquisition current is characterized by millisecond bursts above average acquisition current 2 Average current is typically only the first two seconds of TT
6. 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 provided via the 1PPS pin of the A1035 H 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 UTG 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 satellites static GPS simulator scenario V1 2 May 11 User s Manual Page 31 of 38 maestro GPS receiver 10 5 Reset Signal The nRST pin is an input pin The nRST pin can be used to generate a reset on the A1035 H module
7. AVA LC i n o NR NRRRRRTR 8 2 PENN 11 AUK 12 3 1 Minimum Configuration 12 NNN 15 5 STA Port SAME vr 15 1 01002510 EEE EE 15 4 Mechanical Outline an rnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnennnnennnnennnnennnnennnnennnnennnne 16 4 1 Details Component SIGE A T1095 FT EE 16 4 2 Details Solder Side A1035 H EE 17 5 Pin out InformatiOn s axrannnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnnnnnnnnnunnnennunnnenn 18 SA AV OU POND EE NAAN 18 5 2 Description A1035 H Signals aa 19 5 Mel al EN TUE VIAE ORE DE E UC M EU TU UIDE ode UTE 20 6 Electrical Characteristics 1 REENEN KAANAK ANNA ANN KENE EEN EEN Ke 21 EG Pe rn e qoo RET ANA TAKATAK DIAD seca seacccacsneecsecaneacaed 21 6 2 Absolute Maximum Ratings aa 21 D 9 DO BETA Characterist er 22 vae cc 23 7 1 Proposed Footprint for Soldering aa 23 7 2 Recommended Profile for Reflow Soldering rrrnrrnarerannrannnarnnnrnnnrnanennnnnnnn 23 S USE OB AL ANONN ee 25 8 1 COMMECTIONN OF RF SINA EEE 25 o2 Egger niri EN 26 8 2 1 Recommended Harameterg a 26 8 2 2 Switching External Antenna Gupphy a 27 ST mo OE EEE 27 9 Quality and Rehability A AA 28 DT tmvrenmemal e onmalloris EEE BOND GA 20 9 2 Product AIUTO og MEER 28 SJ gd AUCO TO E 28 V1 2 May 11 User s Manual Page 4 of 38 maestro 3 GPS receiver 4 10 Appication and Mao ccm 29 LO
8. NARIN Ben elt E AON E 29 10 2 External Antenna Status Adaptation rrrerraronnrrarnnnrnnrnnnenernnnnnernnnnnnnnernnsnnn 29 10 21 External Antenna SENSO Laverne de edel ausa Fo santa MGA ANA ONG 29 10 2 2 External Antenna Sensor with Current Limiter a 30 10 3 VANT Pin antenna voltage input om 31 10 4 1PPS Pin 1 pulse per second om 31 VS RES nA ee eae TT 32 VS MERE OU EE 32 LO Ko E tun EN d IOU EE 32 10 6 Battery Back up 33 OT PATRON MOOO AA 34 WOO AOS AA AA 34 10 8 1 Entering Hibernate Mode with ON OFF Pin rrrnnnnnanrennnennanrvnnrnranennnrnnannnnnennnnnnnsennn 34 10 8 2 Entering Hibernate Mode with Shutdown Commande 34 11 Evaluation Kit EVA1035 H EE 35 Ra Ee Ri e dn d ensi notre E RO LR Re LEE quus 36 LA Ee 0 E 36 12 2 Related Documents 36 KE AEN AR ele EE 36 13 LIST OT FIQULES eee 37 14 List of Tables AA 38 V1 2 May 11 User s Manual Page 5 of 38 maestro GPS receiver 1 Introduction Maestro s GPS receiver module smart antenna A1035 H is a highly integrated GPS antenna receiver module based on the technology of the GPS receiver module A1084 and a ceramic GPS patch antenna Like on the A1084 A an RF switch is integrated on the module allowing changing of RF input from the on module antenna to an external antenna The module is capable of receiving signals from up to 20 GPS satellites and transferring them into position and timing information that can be read over a serial port S
9. minimum configurations for NMEA output and commands sent and received via an RS232 interface based on the GPS antenna module A1035 H using the on module antenna While the first version foresees that Vcc is applied continuously the second version assumes a separate back up battery In order to go to Hibernate Mode low power mode the two configurations use different approaches The first version requires toggling of the ON OFF pin and continued supply of Vcc With the second version a shutdown command is required then after a further delay Vcc can be switched off completely In both cases the current drawn will drop drastically See also chapter 10 8 Hibernate Mode Shown from top without lid pads shown for better understanding A1035 H GSC3f LPx Figure 5 Minimum configuration A1035 H with continued Vcc supply Remarks e Use separate ground plane for antenna ground e External antenna input impedance is 50 Q Match as close as possible e Maximum allowed external antenna current is 50 mA Consider a current limiter e Supply Vcc continuously use toggling of ON OFF to switch between normal operation and hibernate mode V1 2 May 11 User s Manual Page 12 of 38 maestro 3 GPS receiver Shown from top without lid pads shown for better understanding A1035 H GSC3f LPx Back up supply options A Supercap charged through GPS module B Primary cell decoupled with diode Figure 6 Minimum configura
10. 3 Maestro 12 3 Related Tools e GPS Cockpit Maestro e SIRF Demo SIRF e SIRF Flash SIRF V1 2 May 11 User s Manual Page 36 of 38 maestro GPS receiver 13 List of Figures Sleigh ER Ee e 6 Figure 2 A1035 H tape specifications le 8 Figure 3 A1035 H tape specifications 2 Q QX aa 9 Figure 4 A1035 H tape specifications 3 QQQQ aaa 9 Figure 5 Minimum configuration A1035 H with continued Vcc supply 12 Figure 6 Minimum configuration A1035 H with Vbak eserenornnrnnnnnnnnernrrnnnnnrnnennnen 13 Figure 7 RS232 level shifter for minimum configurations nnannannannnnnnnnannnnn 14 Figure 8 Mechanical outline component side A1035 H s nnannennnnnnnnnneneereenennnnnnne 16 Figure 9 Mechanical outline solder side A1035 H aa 17 Figure 10 Pin out information bottom view A1035 H eeesessse 18 Figure 11 Soldering footprint proposal A1035 H cc cecceeccseeeeeeeseeeeaeeeeeeeeeeeens 23 Figure 12 Antenna connector strip line ATO3AnbH a 25 Figure 13 Strip line parameters ATO32DH a 25 Figure 14 Switching external antenna supply using RFPWAUP 2f Figure 15 Application note Antenna sensor adaptation 30 Figure 16 Application note Antenna sensor adaptation with current limiter 30 Figure 17 Application note Recommen
11. FF 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 EE Power supply 0 3 3 6 V Voltage to any pin 0 3 1136 V Input current on any pin Absolute sum of all input currents during overload condition E Storage temperature Antenna supply voltage 255 v Antenna supply current Table 6 Absolute maximum ratings Stresses beyond those listed under Absolute Maximum Ratings may cause permanent 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 operational sections of this specification is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability V1 2 May 11 User s Manual Page 21 of 38 maestro GPS receiver Pal Tau e 6 3 DC Electrical Characteristics Symbol Parameter J J 1PPS TX1 TX0 RFPWUP nWAKEUP Parameter __ Min Max Unit _ Vo 1 02 eo v 1o vi CSCS BV EERE AA ee duum ON OFF JN y 084 15 V 93 938 V ANT SW IM 20 V Ooo M 2j V Table 7 DC electrical characteristics V1 2 May 11 User s Manual Page 22 of 38 maestro GPS receiver 7 Mounting This chapter describes the suggested mounting process for th
12. Resetting 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 A1035 H is already equipped with a voltage monitoring device that generates a proper power on reset at the appropriate threshold and delay Additionally it addresses the brown out protection issue Usually there is no need to deal with the reset input externally therefore the general advice is to leave this pin open 10 5 2 External Reset Circuit If for some reason s an external reset input is really desired the following instructions 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 RESET lt gt nRESET RESET high active low active Figure 17 Application note Recommended external reset circuit V1 2 May 11 User s Manual Page 32 of 38 maestro GPS receiver 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 through the module during normal operation the battery primary cell is decoupled thru a diode mE d Vbek Vbek GK NSR0130 Q EE t D E 3 Z2 D Battery mp T mp DI D
13. S Characteristics Channels 20 parallltracking Correlators 200 000 plus Freueny L1 E1575 MHz Tracking Sensitivity External active antenna 159 dBm On module antenna 157 dBm Time To First Fix TTFF theoretical minimum values values in real world may differ Table 1 A1035 H 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 Note Performance sensitivity and TTFF might slightly decrease below 30 C 1 2 2 Mechanical Characteristics A1035 H Mechanical dimensions Length 30 48 mm 1 2 Width 16 51 mm 0 65 Height 5 00 mm 0 2 A1035 H Weight 4 0 g 0 14 oz Table 2 A1035 H dimensions and weight 1 3 Handling Precautions The GPS receiver module A1035 H is sensitive to electrostatic discharge ESD Please handle with appropriate care V1 2 May 11 User s Manual Page of 38 maestro GPS receiver 2 Ordering Information 2 1 GPS Receiver A1035 H The order number is built as follows e A1035 Hxxx A1035 H for the A1035 H module The xxx reflects the current firmware version If no firmware version is noted in an order the lates
14. SEQUENCES 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 DOCUMENTATION IS NOT AUTHORIZED FOR USE IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF MAESTRO THIS DOCUMENT MAY PROVIDE LINKS TO OTHER WORLD WIDE WEB SITES OR RESOURCES BECAUSE MAESTRO HAS NO CONTROL OVER SUCH SITES AND RESOURCES MAESTRO 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 MAESTRO 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 MAESTRO RESERVES THE RIGHT TO CHANGE MODIFY OR IMPROVE THIS DOCUMENT OR THE PRODUCT DESCRIBED HEREIN AS SEEN FIT BY MAESTRO WITHOUT FURTHER NOTICE V1 2 May 11 User s Manual Page 3 of 38 maestro GPS receiver Table of Contents IMMFOGUGCUION varaner m TS 6 ings 6 eZ e aire SIG ETT 7 Tie NG Ee ee 7 1 2 2 Mechanical Characterstce a T ko Me alo 111910 Maga e218 e AA AA T 2 Ordering e e un aO EE 8 2 1 GPS FEN A TO o eee e TERESE EEE TEARRE I 8
15. cording 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 19 Evaluation kit EVA1035 H For further information please contact Maestro V1 2 May 11 User s Manual Page 35 of 38 maestro GPS receiver 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 Any inputs regarding possible errors or mistakable verbalizations and comments or proposals for further improvements to this document made to Maestro Hongkong are highly appreciated Maestro Wireless Solutions Limited Add Unit 3603 09 36 F 118 connuaught Road West HK Main Line 852 28690688 Fax 852 25254701 support aps maestro wireless com www maestro wireless com 12 2 Related Documents GPS Firmware GSC3 Maestro GPS Evaluation Kit EVA1035 H Maestro SiRF Binary Reference Manual SIRF SiRF NMEA Reference Manual SiRF GPS AppNote Firmware GSC3 Maestro GPS AppNote Ephemeris Push GSC3 Maestro GPS AppNote Backup GSC3 Maestro GPS AppNote EDLC Backup GSC3 Maestro GPS AppNote 1PPS Pulse Width GSC
16. ded external reset circuit 32 Figure 18 Application note Module back up 33 Figure 19 Evaluation kit EVA10395 H eese 35 V1 2 May 11 User s Manual Page 37 of 38 maestro GPS receiver 14 List of Tables Table 1 A1035 H GPS charachertsice aa 7 Table 2 A1035 H dimensions and weight 7 Table 3 Additional equip MEN aai GG gea lE lv ou P anG aasa 11 Table 4 Pin description A1035 H EE 19 Table 5 A1035 H electrical characteristics X aaa 21 Table 6 Absolute maximum ratings Aa 21 Table 7 DC electrical characteristics a 22 Table 8 Reflow soldering profile A TO33H aaa 23 V1 2 May 11 User s Manual Page 38 of 38
17. e A1035 H V1 2 May 11 User s Manual Page 17 of 38 maestro N GPS receiver 5 Pin out Information 5 1 Layout A1035 H RXO 21 1 nRST TXO 20 2 BOOTSEL TX1 19 3 Vcc RX1 18 4 RFPWUP ON OFF 17 5 GPIO 15 nWAKEUP 16 6 GND 1PPS 15 Vbak 14 GPIO 0 13 ANT SW 12 7 ANT GND 8 ANT EXT 9 VANT DNC11 1 10 DNG Figure 10 Pin out information bottom view A1035 H V1 2 May 11 User s Manual Page 18 of 38 maestro GPS receiver 5 2 Description A1035 H Signals Pin Symbol Function Description O Z o Reset input open HIGH no reset LOW reset see 10 5 Reset Signal opecial boot mode leave open for normal operation HIGH boot loader active Status of analog section LOW OFF HIGH ON can be used to switch external antenna supply see also GPIOO 5 GPIO 15 Reserved Reserved leave open O leave el EMMMMM Ke feno Powersu Ground pomerm DD ANT GND RF GND e Ground do connect to GROUND connect to antenna ziii beca ues Mu gerendi serm oe PRAAN Power supply antenna m according voltage up 5 0 VDC VANT feeds Pin 8 ANT EXT to a signal to a signal external ren Antenna supply status if LOW external antenna supply voltage can be switched off this is not done internally Power Supply Back up pin of module for super cap or battery see below 1PPS Output 1PPS pulse per second output 16 nWAKEUP Output Status of digital section Low ON High OFF
18. e A1035 H 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 module s pins This will guarantee highest resistance against shocks 7A 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 i A1035 H SCH Ud Solder paste Figure 11 Soldering footprint proposal A1035 H 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 ovens are as follows according to IPC JEDEC J STD 020D Value Peak temperature ROHS compliant process 245 C Average ramp up rate to peak 217 C to Peak 3 C second max Preheat temperature min 150 C max 200 C Ramp up time from min to max preheat temperature 60 120 seconds Temperature maintained above 217 C 60 150 seconds Time within 5 C of actual peak temperature 30 seconds Ramp down rate 6 C second max Time 25 C to peak temperature 8 minutes max Table 8 Reflow soldering profile A1035 H V1 2 May 11 User s Manual Page 23 of 38 maestro GPS receiver As results of soldering may vary among d
19. ifferent 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 optimization V1 2 May 11 User s Manual Page 24 of 38 maestro Y GPS receiver 8 Use of External Antenna 8 1 Connection of RF Signal The ANT EXT 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 O 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 ANT GND should be routed to the ground plane of the PCB the ground plane is on a lower PCB layer by vias as demonstrated in the drawing Motherboard top layer Motherboard GND layer ANT_GND Pin7 ANT_GND Pin7 O Vias to i Solder pads O Vias to 1 Solder pads GND layer top layer Figure 12 Antenna connector strip line A1035 H 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 material is FR4 50 Q strip line fe 0 8 mm ANT GND Figure 13 Strip line parameters A1035 H In this case the width should be about 1 8 times the height of the PCB W 1 8xH
20. mall size and high end GPS functionality are combined at low power consumption Operable at 3 3V 24mA typ 1fix per second UART interface at CMOS level Small form factor of 30 48 x 16 51 mm 1 2 x 0 65 Supported temperature range 40 C to 85 C Single sided SMT component for reflow soldering RoHS compliant lead free Tape amp reel packaging Excellent antenna support o On module patch antenna o Antenna input for direct connection of external active antenna o RF switch to select between antennas The receiver smart antenna module is available as an off the shelf component 100 tested and shipped in tape and reel 1 1 Label The A1035 H label size 9 5 x 9 5 mm contains the following information Hardware rr hardware revision Software 555 50ftware version tt software release Maestro Maestro K WC E CO Location and date code A1035 Hass tt rr GS Factory code A1035 H380 01 01 dada Pasan yy production year kaaa madl ww production week XXXXxx serial number General description Example Pin 1 mark Figure 1 A1035 H label The label is placed on the shield of the module The data matrix code holds the product type software version software release hardware release factory code year amp week of assembly and a 6 digit serial number V1 2 May 11 User s Manual Page 6 of 38 maestro GPS receiver 1 2 Characteristics The module is characterized by the following parameters 1 2 1 GP
21. o more than 95 of the active antennas available in the market 3 3 Serial Port Settings The default configuration within the custom specific GPS firmware is e Serial O 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 and SRAM with a back up power when no system power is available Furthermore starting with FW revision 3 5 0 Ephemeris Push is supported Please see according application note V1 2 May 11 User s Manual Page 15 of 38 maestro GPS receiver 4 Mechanical Outline 4 1 Details Component Side A1035 H 30 48 1 20 59845 1 175 29 845 1 175 16 52 65 45 24 60 43 97 55 12 70 50 11 43 45 10 16 40 8 89 35 7 62 30 7 62 30 6 35 25 6 35 25 5 08 20 5 08 20 3 81 15 3 81 15 2 54 10 2 54 10 1 27 05 1 27 05 0 00 00 0 00 00 16 51 0 65 All dimensions in mm inches Figure 8 Mechanical outline component side A1035 H V1 2 May 11 User s Manual Page 16 of 38 N maestro 3 GPS receiver 4 2 Details Solder Side A1035 H 1 27 x 1 27 sans bo Li 3 81 15 pa us 3 81 15 16 51 0 65 Solder pad size outer pads 1 0 x 0 8 Solder pad size inner pads 1 27 x 1 27 All dimensions in mm inches Figure 9 Mechanical outline solder sid
22. r detecting if an antenna is connected to the module The information about the antenna status can be derived 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 External 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 2 May 11 User s Manual Page 29 of 38 sid E maestro GPS receiver U1 U2 rail to rail single supply Common node on PCB comperator with open drain output ANTSTAT Output open drain with pullup R2 High for 8m lt lant lt 18mA Low for lant lt 9mA or lant gt 18MA Figure 15 Application note Antenna sensor adaptation 10 2 2 External Antenna Sensor with Current Limiter This proposal is similar to the first one bu
23. re support for ON OFF has been included hence a rising pulse on the ON OFF pin will put the A1084 GPS receiver into hibernate state if it is on and wake it up if it is in sleep state During sleep state the receiver draws 20 pA typically and maintains RTC and SRAM Here Vcc must not be switched off See also Figure 5 Minimum configuration A1035 H with continued Vcc supply Therefore this method can be used for configurations where no additional Vbak is available 10 8 2 Entering Hibernate Mode with Shutdown Command When a separate Vbak supply is foreseen an alternative method to enter Hibernate Mode is by sending a shutdown command From firmware version 3 5 0 onwards this is possible using the command PSRF117 16 0B In NMEA mode as described in the manual GPS Firmware GSC3 3 5 0 In SIRF Binary mode the according command can be found in the SiRF Binary Reference Manual Software Commanded Off Message ID 205 After a delay of about 2 s or after the signal RFPWUP went LOW Vcc can be disconnected The RTC will keep on running and SRAM is backed with the typical current of 20 uA drawn from Vbak See also Figure 6 Minimum configuration A1035 H with Vbak V1 2 May 11 User s Manual Page 34 of 38 maestro GPS receiver 11 Evaluation Kit EVA1035 H For demonstration and easy evaluation of GPS performance Maestro offers an evaluation kit including one GPS A1035 H module It contains a USB interface with ac
24. t includes 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 application In any case it is the responsibility of the designer to test and verify the implementation Current Limiter LH U2 rail to rail single supply comperator with open drain output Common node on PCB Output open drain with pullup R2 High for 9mA lant lt 18mA Low for lant 9mA4 or lant gt 18mA Figure 16 Application note Antenna sensor adaptation with current limiter V1 2 May 11 User s Manual Page 30 of 38 maestro GPS receiver 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 50 M Note Shortcut between ANT and GND may damage the A1035 H GPS receiver module This should be avoided by using an antenna current limiter The circuit chapter 10 2 2 External Antenna Sensor with Current Limiter works for Vcc from 3 V to 5 V 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 completed version before using It 10 4 1PPS Pin 1 pulse per second pin
25. t version will be provided 2 2 Packing The A1035 H GPS modules come in a tape and reel package suitable for pick and place machines P 40 43 2 Figure 2 A1035 H tape specifications 1 V1 2 May 11 User s Manual Page 8 of 38 DE e maestro 7 GPS receiver Figure 4 A1035 H tape specifications 3 One complete reel holds 700 A1035 H modules There are 2 kinds of packaging for shipment A One box holds 1 reel Reel diameter 38 cm Outer Box dimensions 38 8 W x 38 8 L x 5 7 H cm Gross weight 5 06 Kg Net weight 4 13 Kg V1 2 May 11 User s Manual Page 9 of 38 maestro N GPS receiver B One box holds 2 reels Reel diameter 38 cm Outer box dimensions 38 W x 38 L x 12 3 H cm Gross weight 10 03 Kg Net weight 8 26 Kg V1 2 May 11 User s Manual Page 10 of 38 maestro GPS receiver 2 3 Additional Equipment EVA1035 H Evaluation Kit including one module A1035 H Table 3 Additional equipment A detailed description of the EVA1035 H Evaluation Kit can be found in the appropriate manual V1 2 May 11 User s Manual Page 11 of 38 maestro GPS receiver 3 Quick Start In order to allow an easy and quick start with the A1035 H module 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 pictures show two versions of recommended
26. tion A1035 H with Vbak Remarks e Use separate ground plane for antenna ground e External antenna input impedance is 50 Q Match as close as possible e Maximum allowed external antenna current is 50 mA Consider a current limiter e A battery back up circuit for the RTC Real Time Clock should be considered see chapter 10 6 Battery Back up e Send shutdown command along with a further delay 2s before switching Vcc off V1 2 May 11 User s Manual Page 13 of 38 maestro N GPS receiver For completeness the following pictures show the use of an RS232 level shifter RS232 Out DB9 female Figure 7 RS232 level shifter for minimum configurations Remarks e Place C1 to C5 here 0 1uF close to MAX3232 For capacity values see datasheet of actual component used e Use 3 3V level shifter MAX3232 or equivalent V1 2 May 11 User s Manual Page 14 of 38 maestro GPS receiver 3 2 Antenna Although the A1035 H offers an on module antenna an additional external active antenna can be used Switching between both antennas is done via pin 12 see also 5 2 Description A1035 H Signals It is recommended to use an active GPS antenna with supply voltage of 3 to 5 VDC and a current draw of 50 mA maximum The quality of the GPS antenna chosen is of paramount importance to the overall sensitivity of the GPS system An active antenna should have a gain 2 20 dB and a noise figure lt 1 5 dB which applies t
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