GE-2525LPX User Manual
Contents
1. CR lt LF gt End of message termination Depending on the number of satellites tracked multiple messages of GSV data may be required RMC Recommended Minimum Specific GNSS Data Table 8 contains the values of the following example GPRMC 161229 487 A 3723 2475 N 12158 3416 W 0 13 309 62 120598 10 Table 8 RMC Data Format Name Example Units Description Message ID GPRMC RMC protocol header UTC Time 161229 487 hhmmss sss Status A A data valid or V data not valid Latitude 3723 2475 ddmm mmmm N S Indicator N N north or S south Longitude 12158 3416 dddmm mmmm E W Indicator W E east or W west Speed Over 0 13 knots True Ground Course Over 309 62 degrees 17 Ground Date 120598 ddmmyy Magnetic degrees Variation Variation sense E east or W west Not shown Mode A A Autonomous D DGPS E DR Checksum TO lt CR gt lt LF gt End of message termination VTG Course Over Ground and Ground Speed Table 9 contains the values of the following example GPVTG 79 65 T M 2 69 N 5 0 K A 38 Table 9 VTG Data Format Name Example Units Description Message ID GPVTG VTG protocol header Course over 79 65 degrees Measured heading rgound Reference T True Course over degrees Measured heading ground Reference M Magnetic Speed over 2 69 Knots Measured speed ground Units N Knots Speed2. Used ID of Satellite Sv on Channel 12 Used PDOP 1 8 Position Dilution of Precision HDOP 1 0 Horizontal Dilution of Precision VDOP 1 5 Vertical Dilution of Precision Checksum 33 lt CR gt lt LF End of message termination gt Table 5 Mode 1 Value Description M Manual forced to operate in 2D or 3D mode A Automatic allowed to automatically switch 2D 3D Table 6 Mode 2 Value Description 1 Fix not available 2 2D 3 3D GSV GNSS Satellites in View Table 7 contains the values of the following example GPGSV 2 1 07 07 79 048 42 02 51 062 43 26 36 256 42 27 27 138 42 71 GPGSV 2 2 07 09 23 313 42 04 19 159 41 15 12 041 42 41 Table 7 GSV Data Format Name Exampl Units Description e Message ID GPGS GSV protocol header 16 Total Number of 2 Range 1 to 3 Messages Messages 1 Range 1 to 3 Number Satellites in 07 View Satellite ID 07 Channel l Range 1 to 32 Elevation 79 degrees Channel 1 Range 00 to 90 Azimuth 048 degrees Channel 1 True Range 000 to 359 SNR C No 42 dBHz Channel 1 Range 0 to 99 null when not tracking Satellite ID 27 Channel 4 Range 01 to 32 Elevation 27 degrees Channel 4 Range 00 to 90 Azimuth 138 degrees Channel 4 True Range 000 to 359 SNR C No 42 dB Hz Channel 4 Range 00 to 99 null when not tracking Checksum 71
3. 0 32V Z Vg 0 86V M i 13 Purpose I O 2 85V Von Z 2 14V Vor 0 71V General 3 15V2Vm 20V 0 32V Z Vg 0 86V n ae De Purpose I O 2 85V 2 Von 2 14V Vor 0 71V General 3 15Vz Vg 2 20V 0 32V Z Vg 0 86V di el Jis Purpose I O 2 85V 2 Von 2 14V Vor 0 71V One pulse 3 15Vz Vg 20V 0 32V Z Vg 0 86V 29 PPS O per second 30 GND G Ground Reference Ground Definition of Pin assignment VCC_3V3 3 3V DC power Input This is the DC power supply input pin for GPS system It provides voltage to module GND GND provides the ground Boot Set this pin to high for programming flash RXA This is the main receiver channel and is used to receive software commands to the board from SIRFdemo software or from user written software RXB This is the auxiliary receiving channel and is used to input differential corrections to the board to enable DGPS navigation TXA This is the main transmitting channel and is used to output navigation and measurement data to SIRFdemo or user written software TXB For user s application not currently used RF_ON This pin indicates state of RF voltage GPS RF IN This pin receives GPS analog signal The line on the PCB between the antenna or antenna connector has to be a controlled impedance line Microstrip at 50 V_ANT_IN This pin is reserved as external DC power supply input for active antenna If using 2 85V active antenna pin 20 has to be c
4. L2770rn ns PO 127 Tn 127r P2 P3 1277 Mn 027 P4 A ira ka 77len Le ns rab Pj L27 0rn 127 Ona 29 127 nn DI 7 Pl VAYA 150 0rw Figure 1 7 Recommended Layout Pad 1 7 Mechanical Layout 25 40 0 20 o 25 40 A 5 j f E j Rl S i N NL I uU CU j lt 3 EN 3 of e 5 1 i Bottom view 1 90 Top view 1 28mmx9 Figure 1 8 Mechanical Layout 1 8 GE 2525LPX Test Software Specification No Function Specification 1 Clock offset 88000Hz lt Test rate lt 104000Hz 2 Clock Drift Test rate lt 200Hz 3 C No Hi Power Mean Test rate x 39dB 4 C No Hi Power Sigma Test rates2dB 5 Bit Sync Test rate 5 Sec 6 Frame Sync Test rate lt 28 Sec 7 Phase Error Test rate 0 22 8 RTC RTC Frequency 31000 lt Test rate 33500 Reliability and quality target MTBF gt 10000 hours 1 9 Hardware interface P16 P17 P18 P19 P20 P21 P22 P23 P24 P25 P26 P27 P28 P29 P30 GPI PPS GND TOP GND RF_IN GND V ANT IN VCC RF OUT Y RTC 3 3 RESET GPIO 10 GPIO 1 GPIO 4 GPIO 0 GPIO 13 O 15 VIEW Figure 1 9 Hardware Interface Table 1 3 Definition of Pin assignment Pin Signal Name _ I O Description Characteristics 1 vec 3v3 h PO SUPPLY Inc 3 3145 i Voltage input 2 GND G Ground Reference Ground E Bootselect I Boot mode 3 15
5. V_RTC_3V3 pin It can reduce noise and increase the stability 4 REIN Connecting to the antenna has to be routed on the PCB The transmission line must to be control impedance from RF_IN pin to the antenna or antenna connector of your choice Impedance 500 5 Power Connect V_GPS_3V3 pin to DC 3 3V The power supply must add bypass capacitor 10uF and 1uF It can reduce the Noise from power supply and increase power stability 6 Active antenna bias voltage The VCC_RF OUT pin pin 20 is provide voltage 2 85V If you use active antenna you can connect this pin to V ANT IN pin pin 19 to provide bias voltage of active antenna The bias voltage will be through GPS_RF_IN pin to provide active antenna bias voltage from Vcc RF OUT pin If your bias voltage of active antenna isn t 2 85V you can input bias voltage to V ANT IN pin pin 19 And input bias voltage of you need The input bias voltage will through GPS RF IN pin to provide active antenna bias voltage from V ANT IN pin PS 1 The maximum power consumption of active antenna is about 85mW 2 The input gain ranges are 19 22dB 7 GPIO The GPIO pin is recommended to connect to serial resistance 220 if use the GPIO function If no use GPIO functions it doesn t connect anything 1 6 Recommend Layout PAD A 24 500 12770 i S 9 12770 n Dg LETTOrn PS 57 al i P74 lt Be IR 1 27 0rn EA B8
6. 35 sec open sky Typical 8 Chip Hot start 1 sec open sky Typical 9 Reacquisition less than 1s 10 Position accuracy IOmeters at 2D RMS 11 Maximum altitude 18000 m 12 Maximum velocity 514 m s 13 Trickle power mode Duty cycle lt 34 Variable 14 Update rate Continuous operation 1Hz 15 DGPS WAAS EGNOS Interface 16 LNA 15dB Gain Typical 17 I O Pin 30pin Power consumption 18 Vcc DC 3 3 5 19 Current Avg 48mA 3 3V without ext antenna Environment 20 Temperature Operating 40 85 C Storage 40 85 C 21 Humidity lt 95 1 5 Application Circuit cs 6 D tuFXSEV 16V OUF YSVOON ve Ly 73 ted LES 1 a mcam Ld var L IS 5 r m pnm al Ls T gt Figure 1 6 Application Circuit Reference Note 1 Ground Planes These pins 2 10 16 18 30 should be connect to ground 2 Serial Interface I The TXA pin is the serial output data Default NMEA II The TXB pin is the serial output data Default Null III The RXA pin is the serial output data Default NMEA IV The RXB pin is the serial input data Default Null 3 Backup Battery When module is working must to supply VCC 3V3 P1 and V RTC 3V3 P21 power at the same time It s recommended to connect a backup battery to V RTC 3V3 pin In order to enable the warm start and hot start features of the GPS receiver HH xa a If you use backup battery should be add a bypassing capacitor 10uF at
7. GA 161229 487 3723 2475 N 12158 3416 W 1 07 1 0 9 0 M 0000 18 Table 2 GGA Data Format Name Example Units Description 14 Message ID GPGGA GGA protocol header UTC Position 161229 48 hhmmss sss 7 Latitude 3723 2475 ddmm mmmm N S Indicator N N north or S south Longitude 12158 341 Dddmm mmmm 6 E W Indicator W E east or W west Position Fix 1 See Table 2 1 Indicator Satellites Used 07 Range 0 to 12 HDOP 1 0 Horizontal Dilution of Precision MSL Altitude 9 0 meters Units M meters Geoid Separation meters Units M meters Age of Diff Corr second Null fields when DGPS is not used Diff Ref Station 0000 ID Checksum 18 lt CR gt lt LF gt End of message termination Table 3 Position Fix Indicators Value Description 0 Fix not available or invalid 1 GPS SPS Mode fix valid 2 Differential GPS SPS Mode fix valid 3 5 Not Supported 6 Dead Reckoning Mode fix valid GSA GNSS DOP and Active Satellites Table 4 contains the values of the following example GPGSA A 3 07 02 26 27 09 04 15 1 8 1 0 1 5 33 Table 4 GSA Data Format Name Example Units Description 15 Message ID GPGSA GSA protocol header Mode 1 A See Table 5 Mode 2 3 See Table 6 ID of Satellite 07 Sv on Channel 1 Used ID of Satellite 02 Sv on Channel 2
8. V Vm 2 20V 0 3V 2 Vi 0 86V 4 RXA O SerialpotA 3 15Vz Vig Z 20V 0 3V2Vi 0 86V 5 TXA O Serialport A 2 85V Von 2 2 14V Vor 0 71V 6 TXB O Serialport B 2 85VZ Von Z 2 14V Vor 0 71V 7 RXB I SerialportB 3 15VZ Vg 2 0V 0 3V Vg 0 86V General 3 152 Vg 2 2 0V 0 32Vz Vg 0 86V n di purpose I O 2 85V 2 Von 2 14V Vor 0 71V Indicates 9 RF ON O power state Vo 2 85V Vor 0V of RF part 10 GND G Ground Reference Ground 11 GND G Ground Reference Ground 12 GND G Ground Reference Ground 13 GND G Ground Reference Ground 14 GND G Ground Reference Ground 15 GND G Ground Reference Ground 16 GND G Ground Reference Ground GPS Signal 17 RF IN I 50 Q 1 57542GHz u input 18 GND G Ground Reference Ground Active Receiving DC power supply for active 19 V ANT IN I Antenna antenna Bias voltage bias Supply DC 2 85V 2 20 VCC RF OUTO Antenna Current 30mA Bias voltage Backup DC 2 5V 3 6V 21 V RTC 3V38 I voltage Current lt 10 uA supply Reset Vm gt 2 3V V r lt 0 8V 22 Reset I Active low General 3 15VZz Vg Z 20V 0 32V Z Vg 0 86V en Me Purpose I O 2 85V 2 Von 2 14V Vor 0 71V General 3 15Vz Vg Z 20V 0 32V Z Vg 0 86V 24 GPIO 1 VO Purpose VO 12 85V 2 Von 2 2 14V Vor 0 71V General 3 15V2Vm 20V 0 32V Z Vg 0 86V 25 GPIO4 VO Purpose VO 12 85V 2 Von 2 2 14V Vor 0 71V General 3 15Vz Vg 20V
9. itrac wireless GE 2525LPX User Manual Version 1 0 This document contains information highly confidential to Trac Wireless It is provided for the sole purpose of the business discussions between customer and Trac Wireless and is covered under the terms of the applicable Non Disclosure Agreements Disclosure of this information to other parties is prohibited without the written consent of Trac Wireless 3 1 3 2 Content O 2 Software IS EEE 14 GPS Receiver User SOM Se ee 20 Package Specification and Order Information uusensensesseeneennnennnneennnnnn 20 L sd lt Eres Standard Retlow aut s 21 1 Introduction GE 2525LPX low power and small form factor board is the newest generation of GPS module The module is powered by latest SIRF Star Ill single chip and Trac Wireless proprietary navigation technology that provides you with stable and accurate navigation data The smallest form factor and miniature design is the best choice to be embedded in a device such as portable navigation device personal locator speed camera detector and vehicle locator Product Features 20 parallel channels SMT type with stamp holes TCXO design 0 1 second reacquisition time Small form factor with embedded SiRF Star III single chip technology NMEA 0183 compliant protocol customize protocol Enhanced algorithm for navigation stability Excellent sensitive for urban canyon and foliage environments DGPSBAS WAAS EGNOS a
10. nd MSAS support Auto recovery while RTC crashes Trickle power supported Build in LNA and saw filter 7 4484 1 1 Product Applications Automotive navigation Personal positioning and navigation Marine navigation 9595 Timing application 1 2 Product Pictures GE 2525LPX Pini6 Pin 15 87A00010003 Pin 30 gt Pint Figure 1 1 GE 2525LPX Front View Table 1 1 The interface board pin definition Pin No GE 2525LPX Pin No GE 2525LPX 1 VCC 16 GND 2 GND 17 RF IN 3 Bootselect 18 GND 4 RXA 19 V ANT 5 TXA 20 VCC RF 6 TXB 21 V BAT 7 RXB 22 RESET IN e eon s SiG 9 RF ON 24 GPIO1 10 GND 25 GPIO4 11 12 14 18 1 3 GE 2525LPX Series Block Diagram GE 2525LPX engine board consists of SiRF star III single chipset technology 4Mbits flash memory and proprietary software The system is described as follows a External antenna b 4 Mega bits flash memory c 22 pin VO pin Antenna 7 f UART Serial Data 1 4 GE 2525LPX Technical Specification Impedance 50Q Table 1 2 Technical Specifications No Function Specification GPS receiver 1 Chipset SiRF Star III GSC3f LPx Digital RF in a single package 2 Frequency L1 1575 42MHz 3 Code C A Code 4 Channels 20 parallel 5 Chip Sensitivity 159dBm 6 Chip Cold start 35 sec open sky Typical 7 Chip Warm start
11. onnected to pin 19 If using 3 3V or 5V active antenna this pin has to be connected to 3 3V or 5V power supply PS The current must be lt 100mA and voltage lt 12V if using external power supply VCC_RF_OUT This pin can provide power 30mA 22 85V for active antenna Reset This pin provides an active low reset input to the board It causes the board to reset and start searching for satellites If not utilized it may be left open PPS This pin provides one pulse per second output from the board which is synchronized to GPS time This is not available in Trickle Power mode V_RTC_3V3 Backup battery This is the battery backup input that powers the SRAM and RTC when main power is removed Typical current draw is 10uA The supply voltage should be between 2 5V and 3 6V GPIO Functions Several I Os are connected to the digital interface connector for custom applications 2 Software Interface 2 1 NMEA Protocol NMEA Output Messages the Engine board outputs the following messages as shown in Table 2 1 Table 2 1 NMEA 0183 Output Messages NMEA Record Description GGA Global positioning system fixed data GSA GNSS DOP and active satellites GSV GNSS satellites in view RMC Recommended minimum specific GNSS data GLL Geographic position latitude longitude VTG Course over ground and ground speed GGA Global Positioning System Fixed Data Table 2 contains the values of the following example GPG
12. over 5 0 Km hr Measured speed ground Units K Kilometer per hour Mode A A autonomous D DGPS E DR Checksum 38 lt CR gt lt LF gt End of message termination GLL Geographic Position Latitude Longitude Table 10 contains the values of the following example GPGLL 2503 6319 N 12136 0099 E 053740 000 A A 52 18 Table 10 GLL Data Format Name Example Units Description Message ID GPGLL GLL protocol header Latitude 2503 6319 ddmm mmmm N S indicator N N north or S south Longitude 12136 0099 Dddmm mmmm E W indicator E E east or W west UTC Time 053740 000 hhmmss sss Status A A data valid or V data not valid Mode A A autonomous D DGPS E DR Checksum 152 lt CR gt lt LF gt End of message termination 19 GPS Receiver User s Tip GPS signal will be affected by weather and environment conditions so 1t is recommended to use the GPS receiver under less shielding environments to ensure GPS receiver has better receiving performance When GPS receiver is moving it will prolong the time to fix the position so it is recommended to wait for the satellite signals locked at a fixed point when first power on the GPS receiver to ensure to lock the GPS signal at the shortest time The following situation will affect the GPS receiving performance 1 Solar control filmed windows 11 Metal shielded such as umbrella or in vehicle 111 Among high buildings iv Under bridge
13. s or tunnels v Under high voltage cables or near by radio wave sources such as mobile phone base stations vi Bad or heavy cloudy weather If the satellite signals can not be locked or encounter receiving problem while in the urban area the following steps are suggested 1 Please plug the external active antenna into GPS receiver and put the antenna on outdoor or the roof of the vehicle for better receiving performance ii Move to another open space or reposition GPS receiver toward the direction with less blockage ili Move the GPS receiver away from the interferences resources iv Wait until the weather condition is improved While a GPS with a backup battery the GPS receiver can fix a position immediately at next power on if the build in backup battery is full recharged 3 1 Package Specification and Order Information Shipment Method Tape and reel 20 3 2 Lead Free Standard Reflow Profile 260 C Ramp down 245 C Ramp up 6 C sec 217 C 3 C sec max 200 C sp 150 C Ts Pretest 60 1 80sec d z s 8 T25 C to peak 480 sec max Time Lead Free Standard Reflow Profile 21
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