GPS Receiver A2235-H
Contents
1. Figure 1 A2235 H label The label is placed on the side of the GPS antenna The data matrix code holds the product type part number software release hardware release factory code year amp week of assembly and a 6 digit serial number Due to limited space on module label only product type year amp week of assembly and 6 digit serial number will be printed on it Representing Factory Product Part Software Hardware Assembly Serial location Number Number a ame Year Week Number Number Ta ee XXXX C XXXXXX ow ENIM mE uM gt 1 000005 Meaning GSL Given Given S see Year 12 Increment Week 1 1 from 000001 up to 999999 Example of MID GSA2235H932201011211000005 V0 1 Aug 12 User s Manual Page 8 of 33 maestro GPS receiver 1 5 Characteristics The module is characterized by the following parameters 1 5 1 GPS Characteristics Channels 48 parallel tracking Comlaos ow Frequency L1 1 575 MHz On module antenna Horizontal Position Accuracy Time To First Fix TTFF Obscuration recovery theoretical minimum values Hot start values in real world may differ Table 1 A2235 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 alm2. 17 4 2 Details Solder Side A2235 H rrrrrnarnnnnnnrnnnnnnrnnnnnnrnnnnnnnnnrnnnnnernannnnennrnnneneennsnne 18 a en ende 19 Oe AV NE VL PE 19 5 2 Description A2235 11 SIGNALS Luvuves resept 20 6 Electrical Characteristics jr 21 5 1 Operating CONGIIONS IER 21 6 2 Absolute Maximum Ratings arrnernnnnnnrnannnnrnarnnnnnernannnernnnnnnrnennnnnnennnannsnnennene 21 6 3 DC Electrical CNAlAClElSUGCS sii 22 A Ae 23 7 1 Proposed Footprint for Soldering cooccoccocncocconnconconnonnconconnconconoconcononnnnnoos 23 12 POB Design CO SM E 23 7 3 Recommended Profile for Reflow Soldering ocoooccocncocncocncococaniconcnnnss 25 3 Quality and RellabilllViscsoimisiaiansaisaiaiaia eau tse a aa aaa GE 26 9 1 Environmental Conditions ccs ciens ittmrt E Cw tp Len p Tete wE a ecu v exe pO rez xw Ee 26 2 Produc Quale Deseo a T UU TS 26 0 9 ad 010 1 1 0 ES aea EAIA EEEE EDENE EEA 26 Fi A 27 MENES NG 21 9 2 Proper Shutdown and Power On Reset POR ccccsccceeeeeeeeeeeeeeeeeeeeeees 27 V0 1 Aug 12 User s Manual Page 4 of 33 maestro gt GPS receiver 9 3 SiRFaware Y Support ccccccccecececcceseesecerecerecereeseserecrecreeseverecarecreesseerevereees 27 9 4 Push to Fix MOd econ 21 Jo HIDE mate MOGE st EEE ERE 28 DENNE 28 9 7 TM GPIO5 pin 1 pulse per second PIN ccocccoccoccccncoccoccconcocnconcncononcnncnnnn
3. 500pA to maintain hot start capability e Active jammer remover o Removes in band jammers up to 80dB Hz o Tracks up to eight CW continuous wave jammers V0 1 Aug 12 User s Manual Page 6 of 33 maestro GPS receiver 1 2 Characteristics Overview The module s most important characteristics are Operable at 3 3V 31mA typ 1fix per second UART interface at CMOS level Small form factor of 17 78 x 16 51 mm 0 7 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 On module patch antenna The antenna receiver module is available as an off the shelf component 100 tested and shipped in tape and reel packaging 1 3 RoHS and Lead Free Information Maestro s products marked with the lead free symbol either on the module or the packaging comply with the Directive 2002 95 EC of the European Parliament and the Council on the Restriction of Use of certain Hazardous Substances in Electrical and Electronic Equipment RoHS All Maestro GPS receiver modules GPS antenna receiver module and telematics units are RoHS compliant V0 1 Aug 12 User s Manual Page of 33 maestro GPS receiver 1 4 Label The A2235 H label size 12 0x 4 0 mm contains the following information yy assembly year ww assembly week A2235 HyyWWXXXXXX xxxxxx serial number A2235 H1211000001 General description Example
4. start the internal firm ware by toggling the ON OFF pin Toggling is done by pulling the signal to HIGH for about 200ms This first toggling can be done after a LOW HIGH transmission was detected at the WAKEUP pin or by simply waiting for 1s after power up In case of configuration for UART mode messages should be transmitted afterwards If no messages should appear a new toggling should be applied 9 2 Proper Shutdown and Power On Reset POR The A2235 H modules require an orderly shutdown process to properly stop internal operation and complete any writes of critical data to BBRAM or EEPROM data area Abrupt removal or drop of main power while the system is running has risks ranging from minor impact on TTFF to fatal permanent corruption of EEPROM code area on the module Please refer to Power ONOFF Sequences and Power On Reset POR on A2100 AB Application Notes A controlled and orderly shutdown while the A2235 H is running in full power mode can be initiated by e A200ms pulse on the ON OFF pin e According messages either in NMEA or OSP mode The shutdown is completed after maximum 1s Therefore the module should be supplied with voltage for that time after the shutdown sequence was initiated 9 3 SiRFaware Support SiRFaware is a low power operating mode that seeks to maintain low uncertainty in position time and frequency and to maintain valid current Ephemeris using either data collected from satellites in vie
5. 235 H tape Specifications 3 occooccccncccncocnconiconoconocononconanocanocnanonanos 11 Figure 5 Minimum configuration A2235 H rarerarenannnnrnnrnnnennnennnnnannnernnennnennnnnnen 14 Figure 6 RS232 level shifter for minimum configurations 15 Figure 7 Mechanical outline component side A2235 H rrnnnnnnnnnnnnrnannnnrnannnnrnnnnnre 17 Figure 8 Mechanical outline solder side A2235 H rrarrannnnrnannnnrnnrnnnnnernannnnnneennnn 18 Figure 9 Pin out information top view A2235 H rrrennnnrnnneranenannnnrnnnnnnnennnennnnnnnn 19 Figure 10 Proposal of Soldering fOOtpriNt ocoooccocncocncocnconcconconncccnnncnnanonanononos 23 Figure 11 Proposal 1 of the PCB desiQN occooccccccocncocncococoncconconncncnnoconanonanononos 24 Figure 12 Proposal 2 of the PCB dA6siQN ccocccocccccncocccoccnnncocncoconononanonononanonanononos 24 Figure 13 Evaluation kit EVA2235 H rrennnnrnnnenarennrnnnrnnnrnnnenanennnnnarnnernnnennnennnnnnnn 30 V0 1 Aug 12 User s Manual Page 32 of 33 NY GPS receiver 13 List of Tables Table 1 A2235 H GPS characteriStiCS oocooccocccoonconnconcocnonncononnnonncnncnnononcanonnnonnnns 9 Table 2 A2235 H dimensions and Welght cooccocccocccccconcoconcncnncononancnconnnnanonnnnnnos 9 Table 3 Additional equipIMenNt oocoocconcccconconconconconoonoocconnononnnonnconcononncanennonnennnnns 13 190164 PN AS ENPIONAZZI5T asiste oieri
6. BLE 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 V0 1 Aug 12 User s Manual Page 3 of 33 maestro GPS receiver Table of Contents 1 Introduction EE rs 6 OA OO IIA 6 1 2 Characteristics Overview o oocooccocccoccocnconconcocncnncnnononnnnnnnnnnnnnnnnnnnnnonnnnncnrnnnnnanes 7 1 3 RoHS and Lead Free Information ooccocccccconcoccconconconocononnconncononnncanonnnnnnnanos 7 CALI 8 ae o TT 9 MEE A AS eE OE aneeenneaes 9 19 2 Mechanical Characteristics on 9 LORANG dor ilo EEE 9 2 OFGS atelier fee RS 10 2 1 GPS Receiver A20235 H cososvisseivssbvtsbvsvEstPPInz iakkins eiut eiua vix telatibiazebusies bad Yiazriapoyt 10 22 PIT 10 E PP NNG 13 3 OUK STAN Pe A cA n Sa EU ISI Ir ne 14 3 1 MINIMUM Configura oM escasas rent SERES RU SERRE QU Std ER Ret RE 14 SNAP INR Qm T Tm 16 STA PO S GLOSS eee 16 3S4 IMProved MEE rrpp lod 16 4 Mechanical OUTE scaner veus 17 4 1 Details Component Side A2235 H rrnnnnanrnannnnrnnnnnnrnarnnnennrnnnnnernnnnnnennrnnnnneennsnnn
7. aging for shipment TBC 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 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 V0 1 Aug 12 User s Manual Page 12 of 33 maestro GPS receiver 2 3 Additional Equipment EVA2235 H Evaluation Kit including one module A2235 H Table 3 Additional equipment A detailed description of the EVA2235 H Evaluation Kit can be found in the appro priate manual V0 1 Aug 12 User s Manual Page 13 of 33 maestro 4 GPS receiver 3 Quick Start In order to allow an easy and quick start with the A2235 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 UART NOTE 1 The A2235 H needs an external pull up resistor to be configured for UART operation Please consider the pull up resistor in your design or pull the GPIO up right after reset by other means NOTE 2 The ON OFF input of the A2235 H needs to be connected to a push pull output of a microprocessor For a wake up including the initial one after power on a LOW HIGH transmission is mandatory NOTE 3 It is recommended to connect the nRST pin of the A2235 H to an open collector open drain output of a microprocessor 3 1 Minimum Configu
8. anac 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 5 2 Mechanical Characteristics A2235 H Mechanical dimensions Length 17 78 0 20 mm 0 7 0 008 Width 16 51 0 20 mm 0 65 0 008 Height 7 11 mm 0 28 Max Table 2 A2235 H dimensions and weight 1 6 Handling Precautions The GPS receiver module A2235 H is sensitive to electrostatic discharge ESD Please handle with appropriate care V0 1 Aug 12 User s Manual Page 9 of 33 maestro 2 Ordering Information 2 1 GPS Receiver A20235 H The order number is built as follows e A2235 Hxxxx ay Y GPS receiver A2235 H is the model name The xxxx refers to the current part number on the module 2 2 Packing The A2235 H GPS modules come in a tape and reel package suitable for pick and place machines A P 24 0 1 AU X702 9 99 9 9969999099996 440 1 dL 915 01 o DI B 1UxPU 40 70 2 Figure 2 A2235 H tape specifications 1 V0 1 Aug 12 User s Manual Aaa 99999 9 999999999099799 AA er 14 2 10 1 gt 1 2 0 1 0 1 mil 28 4 Page 10 of 33 maestro GPS receiver Figure 4 A2235 H tape specifications 3 V0 1 Aug 12 User s Manual Page 11 of 33 maestro GPS receiver One complete reel holds 500 TBC A2235 H modules There are 2 kinds of pack
9. and qualified by the manufacturer according to the specific processes 7 2 PCB Design Guide 1 Drill a through hole with diameter greater than or equal to 3mm in the application PCB which underneath the RF feed point to allivate the interference from RF signal to other part of circuitries Besides ground vias says 8 should be placed surrounding the through hole for further shielding purpose V0 1 Aug 12 User s Manual Page 23 of 33 maestro GPS receiver Figure 11 Proposal 1 of the PCB design 2 If proposal 1 is not allowed Placd a round Copper keep out region diameter 3mm on the application PCB underneath the RF feed point to allivate the interference from RF signal to other part of circuitries Besides ground vias says 8 should be placed surrounding the through hole for further shielding purpose Figure 12 Proposal 2 of the PCB design V0 1 Aug 12 User s Manual Page 24 of 33 maestro GPS receiver 7 3 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 Parameter Value 245 C 3 C second max minz150 C max 200 C 60 120 seconds 60 150 seconds 30 seconds 6 C second max 8 minutes max Table 8 Reflow soldering profile A2235 H As results of soldering may vary among different soldering systems and types of solder and depend on additional factors l
10. anos 28 10 Evaluation Kit EVA2235 H cnica e 30 11 Related Information annannannunnunnunannnnnunnnnnnnnnnunnunnunnnnnnnunnunnunnnnnnnunnunnnnnnnunnunnunn 31 TONTAS REE 31 11 2 Related Documents ssssssssesee HH Immer renes 31 ME Ke RE 31 ITZ STO FIQUIOS e els 32 13 LISt Of TDN eek 33 V0 1 Aug 12 User s Manual Page 5 of 33 maestro GPS receiver 1 Introduction A2235 H is an antenna module with SiRF Star IV ROM based chip and an on board patch antenna 15mm x 15mm x 4mm It is cost down version of A2035 H with re duced size and stacked up antenna architecture In order to have easier migration for existing customers we decided to keep same pin assignment as that of A2035 H Since there is RF feed point underneath the module special PCB design is required on user s application and therefore it cant be stated as pin to pin compatible with A2035 H The module is capable of receiving signals from up to 48 GPS satellites and transferring them into position and timing information that can be read over a serial port The A2235 H is a module designed for a 3 3V environment 1 1 Feature Overview The A2235 H is a new module with the following outstanding features e Fast responsive location experience o High sensitive navigation engine with tracking down to 163dBm o 48 track verification channels o SBAS WAAS EGNOS MSAS GAGAN e Breakthrough micro power technology o Requires only 50
11. awn from Vcc To wake the module up again toggling the ON OFF pin is neces sary 200ms pulse width 9 6 Extended Ephemeris The receiver is capable of supporting two versions of using Extended Ephemeris EE data The first one is the version where the EE data are calculated on a server are transmitted to device incorporating the receiver and are then loaded into the receiver These data can be valid for up to seven days The second version is the internal extrapolation of available natural Ephemeris data This is done automatically and no external support is required The internally calcu lated EE data are valid for up to 3 days The receiver firmware will define which set of EE data to use or will neglect those in case natural data are available need add an external EEPROM part Both ver sions of EE data will help to further lower power consumption in SiRFaware mode 9 7 TM GPIO5 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 UTC an exact and accurate timing signal is pro vided via the 1PPS pin of the A2035 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
12. clock can be derived and maintained within around 90ns under good signal conditions Note The 1PPS clock accuracy directly depends on the position accuracy V0 1 Aug 12 User s Manual Page 28 of 33 maestro GPS receiver The GPS signals travel at the speed of light therefore a position inaccuracy directly translates into 1PPS inaccuracies 10m position deviation 33ns 1PPS deviation typically 100m position deviation 333ns 1PPS deviation typically The NMEA messages containing absolute timing information UTC time are pro vided around 300ms after the 1PPS signal typically This may change with the GPS receiver setup The 1PPS signal is provided on a as is basis with no accuracy specification It s NOT recommended to use 1PPS signal for accurate timing application The given values are based on a 10 satellite static GPS simulator scenario V0 1 Aug 12 User s Manual Page 29 of 33 DE trol maestro GPS receiver 10 Evaluation Kit EVA2235 H For demonstration and easy evaluation of GPS performance Maestro offers an evaluation kit including one GPS A2235 H 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 applicat
13. ection 5 Vout Voltage Permanent 1 8V voltage output for up to 20mA Output current max 6 GND jPowerSupply Ground powersuppy 1 1 1 11 T GPIOG Input Configuration pin for communication mode 10K to CTS SPI CLK 1 8V for UART mode leave open for SPI amp host port I2C modes SPI clock pin when module works in SPI mode GPIO7 Input Configuration pin for communication mode 10K to RTS GND for host port I2C mode leave open for SPI amp SPI CS UART modes SPI chip select pin when module works in SPI mode 9 GND Power Supply Ground power supply 1 1 111 11 Host Port Input Host port I2C clock pin when module works in host I2C CLK port I2C mode 12 GPIO4 Input External interrupt input pin reserved for future use leave open TM_GPIO5 Output Time Mark 1PPS signal I2C CLK I2C clock input for MEMS interface I2C DIO Input Output I2C 1 O for MEMS interface 16 ON OFF Input Connect to push pull output is mandatory Set to LOW by default Toggle to HIGH and back to LOW gt for first start up after power on gt to request a fix in SiRFawareTM or PTF mode gt to go into or wake up out of hibernate mode 17 Extint Input Interrupt input for MEMS interface If ExtInt is not GPIO8 going to be used it is recommended that this pin be tied directly to ground Otherwise a 100K pull down resistor to ground should be connected to the Extlnt pin 18 TX0 Output Serial output 0 NMEA out if con
14. eire ded irei 20 Table 5 A2235 H electrical characteristics ooccocconcoccociccnccnccnconcanconcancanonnnnns 21 Table 6 Absolute maximum ratiNQS coccocconconconionnonconionnoninnncnccnnconcnnnanonncanennnono 21 Table 7 DC electrical characterisStiCS ooccoccconconcccnconiorncannonoonncanonnncanoncnonnnnns 22 Table 8 Reflow soldering profile A2235 H rarrnnrnannnnenannnnrnernannnnrnnrnnnnnernnnnneenusnnee 25 Table 9 Environmental conditions oocoocconconconconionnocnocnonnonncnncnncnncnnonnconcnnnnnnnns 26 V0 1 Aug 12 User s Manual Page 33 of 33
15. figured for UART SPI DO SPI data out pin when module works in SPI mode 19 RXO Serial input O NMEA in if configured for UART SPI DI SPI data in pin when module works in SPI mode Host Port Host port I2C data I O pin when module works in hist I2C DIO port I2C mode Table 4 Pin description A2235 H V0 1 Aug 12 User s Manual Page 20 of 33 maestro GPS receiver 6 Electrical Characteristics 6 1 Operating Conditions Pin Description Min Typical Max 3 Full power mode Searching Peak Current 1 nm 69mA Full power mode Searching Average Current 2 56mA Full power mode Tracking Average Current 3 a TricklePower Mode 14mA O AR Micro Power Mode SiRFaware as Hibemnate Staus 1 fem Table 5 A2235 H electrical characteristics 1 Peak searching current is characterized by millisecond bursts above average searching current 2 Average searching current is typically only the first two seconds of TTFF 3 Tracking current typically includes tracking and the post searching portion of TTFF 6 2 Absolute Maximum Ratings Symbol Parameter Min Max Unit Power supply Voltage to I O pin Input current on any pin Absolute sum of all input currents during overload condition 200 mA Storage temperature Table 6 Absolute maximum ratings Stresses beyond those listed under Absolute Maximum Ratings may cause per manent damage to the device This i
16. ike density and types of components on board the values above should be considered as a starting point for further optimi zation V0 1 Aug 12 User s Manual Page 25 of 33 maestro GPS receiver 8 Quality and Reliability 8 1 Environmental Conditions Operating temperature 40 C 85 C Operating humidity Max 85 r H non condensing at 85 C 3 MSL JEDEC Moisture Sensitivity Level 3 6 months in original package Table 9 Environmental conditions 8 2 Product Qualification Prior to product qualification the GPS receiver is preconditioned according to ElA JEDEC standard JESD22 A113 B Level 3 Basic qualification tests e MSL Classification according to J STD 020C MSL3 245 C Refer to report SZRL2011110048 e MSL Rework Compatibility according to J STD 020C Refer to report SZRL2011110048 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 8 3 Production Test Each module is electrically tested prior to packing and shipping to ensure state of the art GPS receiver performance and accuracy V0 1 Aug 12 User s Manual Page 26 of 33 maestro GPS receiver 9 Applications and Hints 9 1 Initial Module Start After initially applying power to the module it is necessary to
17. ions the Evaluation Kit also pro vides NMEA messages on CMOS level via a terminal plug Figure 13 Evaluation kit EVA2235 H For further information please contact Maestro V0 1 Aug 12 User s Manual Page 30 of 33 NY maestro GPS receiver 11 Related Information 11 1 Contact This manual was created with due diligence We hope that it will be helpful to the user to get the most out of the GPS module 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 Connaught Road West HK Main Line 852 28690688 Fax 852 25254701 support gps Qmaestro wireless com www maestro wireless com 11 2 Related Documents e GPS Evaluation Kit EVA2235 H Maestro e Power ONOFF Sequences and Power On Reset POR on A2100 AB Maestro e SIRF_OSP Reference Manual SIRF e SIRF NMEA Reference Manual SIRF 11 3 Related Tools e GPS Cockpit Maestro e SIRFLive SIRF V0 1 Aug 12 User s Manual Page 31 of 33 NY GPS receiver 12 List of Figures FIGURES Ve A2239 ADO EIRTT OK i 8 Figure 2 A2235 H tape Specifications 1 oooccoocconncococococonoconocnnoccncononanonancnnnos 10 Figure 3 A2235 H tape specifications 2 oooccconconncocncococonoconconnnononononanonanonnnos 11 Figure 4 A2
18. maestro GPS receiver GPS Receiver A2235 H A Description of Maestro s GPS Antenna Receiver Module A2235 H User s Manual Version 0 1 NY GPS receiver Revision History Rev Date Description 0 1 08 15 12 First release mm dd yy Written by Happy wen 08 15 12 HW Checked by Sam Law Matthieu 08 15 12 Approval by Frank Tang Calvin Yau 08 15 12 FLCY V0 1 Aug 12 User s Manual Page 2 of 33 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 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 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 RESPONSI
19. ration The following picture shows the minimum configuration for NMEA or binary outputs received and commands sent via an RS232 interface based on the GPS module A2235 H A2235 H 19 A DESI RXO SPI Di Host Port I2C DIO He lt _ gt 3 3V vec TXO SPI DO 45 lt _ gt JUN VCC 3V3 ExtInt GPlO8 75 ON OFF WAKEUP ON OFF 15 A GND I2C CLK 73 TM GPIOS 73 GPIO4 77 Host Port I2C CLK 95 NC GPIO6 SPI CLK GPIO7 SPI CS GND PAD8 Figure 5 Minimum configuration A2235 H NOTE It is recommended to supply Vcc continuously Use SiRFaware or other low power modes to reduce power consumption of the module while no position information is required V0 1 Aug 12 User s Manual Page 14 of 33 maestro GPS receiver For completeness the following picture shows the use of an RS232 level shifter RS232 Out DB9 female Figure 6 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 NAX3232 or equivalent V0 1 Aug 12 User s Manual Page 15 of 33 NY GPS receiver 3 2 Antenna The A2235 H connected to a ceramic passive GPS patch antenna 3 3 Serial Port Settings The default configuration within the custom specific 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 Fi
20. rst Fix it is recommended to keep Vcc supplied at all times This will allow taking advantage of sophisticated low power mode features of the SiRFstarlV ROM chip set V0 1 Aug 12 User s Manual Page 16 of 33 receiver 4 Mechanical Outline 4 1 Details Component Side A2235 H 65 16 51 All dimensions in mm inches Figure 7 Mechanical outline component side A2235 H V0 1 Aug 12 User s Manual Page 17 of 33 maestro GPS receiver 4 2 Details Solder Side A2235 H 16 51 15 51 XE E TI 3 81 3 81 5 8 9 rm I GL JUU A 2 1 27x1 27 ES P 2 6 3 Jj 5 md gooo 8 st N 8 _ 3 Solder pad size outer pads 1 0 x 0 8 solder pad size inner pads 1 27 x 1 27 All dimensions in mm Figure 8 Mechanical outline solder side A2235 H V0 1 Aug 12 User s Manual Page 18 of 33 c maestro 5 5 Pin out Information 5 1 Layout A2235 H ARST 1 HERRERA 0 49 RX0 NC2 gt 18 TXO Vcc3 3V 3 gt C 47 Extint WAKEUP 4 C 46 ON OFF Vout5 gt 15 12C DIO GND 6 14 120 CLK 13 TM GPIO5 12 GPIO4 41 Host port I2C CLK 10 NC GPIOS 7 gt GPIO7 8 gt GND 9 Figure 9 Pin out information top view A2235 H V0 1 Aug 12 User s Manual Page 19 of 33 mae str GPS receiver 5 2 Description A2235 H Signals Reset input active low Leaveopen 1 0 0 O GPIO3 Leave open VCC3V3 Power Supply 3 0 3 6 V DC WAKEUP Output Status of digital s
21. s 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 V0 1 Aug 12 User s Manual Page 21 of 33 maestro GPS receiver 6 3 DC Electrical Characteristics Symbol _ Parameter Min Max Unit TX0WAKEUP VohG4m 26 Ve V IVAQ4MmA O 045 V O O RXO Vh 20 v V gt 08 V Lo ME 0 0 00 S o NRST Forsafereset 1 1 02 V PONLOFF JVh X O 135 Vc V MI d 3 045 V Table 7 DC electrical characteristics V0 1 Aug 12 User s Manual Page 22 of 33 maestro GPS receiver 7 Mounting This chapter describes the suggested mounting process for the A2235 H GPS re ceiver 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 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 A2235 H 0 6 os TE Figure 10 Proposal of Soldering footprint Please note that copper and solder paste footprint are identical The final footprint has to be evaluated
22. w or Extended Ephemeris methods The SiRFaware mode is entered using the One Socket Protocol an extension of the SIRF Binary Protocol Please refer to the appropriate manual In order to request a fix and to exit SiRFaware it is necessary to toggle the ON OFF pin Toggling is done by pulling the signal to HIGH for about 200ms 9 4 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 V0 1 Aug 12 User s Manual Page 27 of 33 maestro GPS receiver 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 ON OFF pin Toggling is done by pulling the signal to HIGH for about 200ms 9 5 Hibernate Mode In order to enter Hibernate Mode it is necessary to send a shutdown command or to toggle to ON OFF pin by pulling the signal to HIGH for about 200ms Starting with firmware version 4 0 1 the according command is supported in NMEA and SiRF Binary mode After a short delay the module will switch into hibernate mode The RTC will keep on running and SRAM is backed with the typical current of 20 uA dr
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