GS-2525 User Manual
Contents
1. eere 19 2 1 5 RMC Recommended Minimum Specific GNSS Data 20 2 1 6 VTG Course Over Ground and Ground Speed 21 3 GPS Receiver User s 22 3 1 Package Specification and Order Information 23 3 2 Lead Free Standard Reflow Profile eese 23 4 Contact Information SO CHO NA kai 24 Revision HISTOTY sissano sisanne aankan che 24 GS 2525 Figure List Figure 1 1 GS 2525 Front 5 Figure 1 2 GS 2525 Interface Board Front View eene 5 Figure 1 3 Evaluation Kit Front 7 Figure 1 4 System Block Diagram 7 Figure 1 5 Application Circuit 9 Figure 1 6 Recommended Layout Pad eene 11 Figure 1 7 Mechanical Layout eese nennen nnne nnne nnne 12 Figure 1 8 Hardware Interface cesses eene nennen nnns 13 Figure 3 1 Package2. 23 II GS 2525 Table List Table 1 1 The interface board pin definition 5 Table 1 2 Technical Specifications eese einen ennt nnns 8 Table 1 3 Definition of Pin 13 Table 2 1 NMEA 0183 Output 1 1 zawa nuna nuna nuna nnn 17 Table 2 2 GGA Data nennen nnne n natnra nina nant nnn 17 Table 2 3 Position Fix Indicators 18 Table 2 4 GLL Data Foririat erinnere 18 Table 2 5 GSA Data Format 19 Table 2 6 Mode 1 1 cce rero eren nre nnmnnn nnmnnn nnmnnn nnmnnn nnna 19 Table 2 7 Mode 2 2 waa E 19 Table 2 8 GGA Datta Form l Lacie 20 Table 2 9 GGA Data 20 Table 2 10 VTG Data Forimat cccseccsseeeeeseeeeseeeeseeeeneeeeeseeensneeesneeenseeeaseesaeneenseeeeeseaeas 21 GS 2525 1 Introduction Gstar GS 2525 low power and small form facto
3. 5 7220 SYSTEM GPS100 0 28_ 0 0 a 2 SYSTEM_RXA 28 3 GPS_Bootselect SYSTEM 3 3y 3 O 59 GPIO 15 Bootselect 5 Le 0 28 pps Imm f VCC 3V3 2 10uF 10V Y5V GND VcC ava 1 R6 ES GS 2525 C5 C6 RB705D 470 ohm 5 O tuF XGR 16V iouF YSV 10V R1 0 ohm R2 0 ohm 50 ohm Trace U2 3V 3 3mAH Note Figure 1 6 Application Circuit Reference 1 Ground Planes These pin 2 10 16 18 30 should be connect to ground 2 Serial Interface I The TXA pin is the serial output data Default NMEA IL The TXB is the serial output data Default Null III The RXA pin is the serial input 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 If you use backup battery should be add a bypassing capacitor 10uF at V_RTC_3V3 pin It can reduce noise and increase the stability 4 RF_IN Connecting to the antenna has to be routed on the PCB The transmission line must to controlled impedance to connect RF_IN
4. GSA GNSS DOP and active satellites GSV GNSS satellites in view RMC Recommended minimum specific GNSS data VTG Course over ground and ground speed 2 1 4 GGA Global Positioning System Fixed Data Table 2 2 contains the values of the following example GPGGA 161229 487 3723 2475 12158 3416 W 1 07 1 0 9 0 M 0000 18 Table 2 2 GGA Data Format Name Example Units Description Message ID GPGGA GGA protocol header UTC Position 161229 487 hhmmss sss 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 Position Fix Indicator 1 See Table 2 1 Satellites Used 07 Range 0 to 12 HDOP 1 0 Horizontal Dilution of Precision MSL Altitude 9 0 meters Units M meters 17 Geoid Separation meters Units M meters Age of Diff Corr second Null fields when DGPS is not used Diff Ref Station ID 0000 Checksum 18 CR LF End of message termination Table 2 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 GPS PPS Mode fix valid 6 Dead Reckoning Mode fix valid 2 1 2 GLL Geographic Position Latitude Longitude Table 2 4 contains the values of the following Example GPGLL 3723 2475 12158 3416 W 161229 48
5. 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 2 8 GGA Data Format Name Example Units Description Message ID GPGSV GSV protocol header Number of 2 Range 1 to 3 Messages Messages Number 1 Range 1 to 3 Satellites in View 07 Satellite ID 07 Channel 1 Range 1 to 32 Elevation 79 degrees Channel 1 Maximum 90 Azimuth 048 degrees Channel 1 True Range 0 to 359 SNR C No 42 dBHz Range 0 to 99 null when not tracking Satellite ID 27 Channel 4 Range 1 to 32 Elevation 27 degrees Channel 4 Maximum 90 Azimuth 138 degrees Channel 4 True Range 0 to 359 SNR C No 42 dBHz Range 0 to 99 null when not tracking Checksum 71 CR LF End of message termination GS 2525 Depending on the number of satellites tracked multiple messages of GSV data may be required 2 1 5 RMC Recommended Minimum Specific GNSS Data Table 2 9 contains the values of the following example GPRMC 161229 487 A 3723 2475 N 12158 3416 W 0 13 309 62 120598 10 Table 2 9 GGA Data Format Name Example Units Description Message ID GPRMC RMC protocol header UTC Position 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 mm
6. PIN GS 2520 GS 2523 GS 2525 1 VCC V GPS 3V3 VCC 2 GND GND GND 3 Bootselect Bootselect Bootselect 4 RXA RXA RXA 5 TXA TXA TXA 6 TXB TXB TXB 7 RXB RXB RXB 8 GPIO14 NC 9 RF ON 10 GND GND 11 GND N C 12 GND N C 13 GND GND 14 GND N C 15 GND GND 16 GND GND 17 RE IN GPS RF IN 18 GND GND 19 V ANT V ANT IN V ANT 20 VCC RF RF OUT VCC RF 21 V BAT V RTC 3V3 V BAT 22 RESET IN RESET RESET IN 23 GPIOIO N C 24 N C 25 GPIO4 26 GPIOO GPIOO 27 GPIO13 N C 28 15 N C 29 PPS PPS 30 GND nme GS 2525 GS 2525 1 3 GS 2525 Series Block Diagram GS 2525 engine board consists of SIRF star 111 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 30 pin I O pin Antenna UART Serial Data Figure 1 5 System Block Diagram GS 2525 1 4 GS 2525 Technique Specification Impedance 50Q Table 1 2 Technical Specifications No Function Specification GPS receiver 1 Chipset SIRF Star Ill GSC3f LP Digital RF in a single package 2 Frequency L1 1575 42MHz 3 Code C A Code 4 Channels 20 p
7. 7 A 2C Table 2 4 GLL Data Format Name Example Units Description Message ID GPGLL GLL protocol header 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 UTC Position 161229 487 hhmmss ss Status A A data valid or V data not valid Mode A A Autonomous D DGPS E DR Checksum 2C CR LF End of message termination GS 2525 GS 2525 2 1 3 GSA GNSS DOP and Active Satellites Table 2 5 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 2 5 GSA Data Format Name Example Units Description Message ID GPGSA GSA protocol header Mode 1 A See Table 4 2 Mode 2 3 See Table 4 1 Satellite Used 07 Sv on Channel 1 Satellite Used 02 Sv on Channel 2 Satellite Used Sv on Channel 12 PDOP 1 8 Position Dilution of Precision HDOP 1 0 Horizontal Dilution of Precision VDOP 1 5 Vertical Dilution of Precision Checksum 33 CR LF End of message termination Table 2 6 Mode 1 Value Description 1 Fix not available 2 2D 3 3D Table 2 7 Mode 2 Value Description M Manual forced to operate in 2D or 3D mode A Automatic allowed to automatically switch 2D 3D 2 1 4 GSV GNSS Satellites in View Table 2 8 contains the values of the following example GPGSV 2
8. A Serial port A 2 85V 2 Voy 2 2147 Van SU TIV 6 TXB Serial port B 2 85V 2 Voy 2 14V Vor lt 0 71V 7 Serial port B 3 15V 2 2 0V 0 3V lt 0 867 8 GPIO 14 I O General 3 15V 2 Vy 2 2 0V 0 3V V 0 867 purpose 2 85V 2 Voy 2 2147 Vo 0 71V 9 RF_ON Indicates Voy 2 85V Vo OV power state of RF part 10 GND Ground Reference Ground 11 GND Ground Reference Ground 13 GS 2525 12 GND Ground Reference Ground 13 Ground Reference Ground 14 GND Ground Reference Ground 15 GND Ground Reference Ground 16 GND Ground Reference Ground 17 RF IN GPS Signal 500 91 57542GHz input 18 GND Ground Reference Ground 19 VV ANT IN Active Receiving DC power supply for active antenna Antenna Bias bias voltage 20 VCC RF OUT Supply DC 2 85V 2 Antenna Bias lt 30 voltage 21 V_RTC_3V3 Backup DC 2 5 3 6V voltage supply Current lt 10uA 22 Reset Reset Active gt 2 3V V lt 0 8V low 23 GPIO 10 I O General 3 15V 2 Vy 2 2 0V 0 3V lt 0 867 purpose l O 2 85 2 Voy 2 14V Vo lt 24 1 I O General 3 15V 2 2 0V 0 3V V 0 86V purpose I O 2 85 2 Voy 2 14V Vo 5 25 GPIO 4 General 3 15V 2 Vy 2 2 0 3V lt 0 867 purpose I O 2 85 gt 2 14V Vo 5 26 0 I O Gene
9. GS 2525 GS 2525 User Manual Version 1 0 2007 09 29 HangZhou KinCony Electronics CO LTD Fax 0571 88009850 3 Http www hificat com GS 2525 Lac ANS 1 cn 4 11 Product applications wA akaa aaa 4 1 2 Product aa 5 1 3 GS 2525 Series Block Diagram 0 7 1 4 GS 2525 Technique Specification eene 8 1 5 Application Circuit Den 9 1 6 Recommended layout nennen nnn nnne nnns 11 1 7 Mechanical Layout 12 1 8 GS 2525 Test Software Specification 12 1 9 Hardware Interface AIKA KUKAA KUKAAA KUKAAA KUKANA Kana Kaamua 13 2 Software Interface wi Iwa coxa Ies 17 2 1 NMEA V3 0 Protocol eee tnter 17 2 1 1 GGA Global Positioning System Fixed Data 17 2 1 2 GLL Geographic Position Latitude Longitude 18 2 1 3 GSA GNSS DOP and Active Satellites 19 2 1 4 GSV GNSS Satellites in View
10. J n 127 127 J 1 7 Mechanical Layout GS 2525 j 0 20 _ 220 015 zi 25 40 0 20 a L e j NE aul D ME lt N Bottom view amp Ou Figure 1 8 Mechanical Layout 1 8 GS 2525 Test Software Specification No Function Specification 1 Clock offset 88000Hz SHI 104000Hz 2 Clock Drift 200Hz 3 C No Hi Power Mean 39dB 4 C NoHi Power Sigma HI 2dB 5 Bit Sync lt 5 Sec 6 Frame Sync HI 28 Sec 7 Phase Error lt 0 22 8 RTC Frequency HIA 31000 lt 288 lt 33500 gt 10000 hours GS 2525 1 9 Hardware interface P16 P17 P18 P19 P20 P21 P22 P23 P24 P25 P26 P27 P28 P29 P30 TOP VIEW RF_IN GND Y ANT IN YCC RF OUT Y RIC 3Y3 RESET GPIO 10 GPIO 1 GPIO 4 GPIO 0 GPIO 13 GPIO 15 PPS GND Figure 1 9 Hardware Interface Table 1 3 Definition of Pin assignment Pin Signal Name Description Characteristics 1 VCC_3V3 DC Supply 0 3 3V 5 Voltage input 2 Ground Reference Ground 3 Bootselect Bootmode 3 15V 2V 2 0V 0 3V lt Vz 0 86V 4 Serial port A 3 15V 2 V 2 0V 0 3V lt Vz 0 86V 5 ITX
11. altek com Headquarter Address 1071 Chung Cheng Rd Suite 9F 1 Tao Yuan City Taiwan TEL 886 3 3569666 FAX 886 3 3580050 Web Site http www royaltek com Web Site Customer Service http www royaltek com contact 5 Revision History Title REB 3571LP GPS Module Doc Type User Manual 1 Author Change notice umber 1 0 2007 09 29 Amy Liu Initial Release 24
12. arallel 5 Sensitivity Acquisition It shall show C No 40 dB Hz when external power 130dBm 6 Chip set cold start 35s 9 open sky Typical 7 Chip set warm start 35s 9 open sky Typical 8 Chip set hot start 1s open sky Typical 9 Reacquisition less than 1s 10 Position accuracy 10meters 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 Testability It shall be able to be tested by SIRF test IV and single channel simulator 16 Protocol setup It shall store the protocol setup in the SRAM memory 17 DGPS WAAS EGNOS Interface 18 ILNA 15dB Gain Typical 19 I O Pin 30pin Power consumption 21 Vcc DC 3 3 5 22 Current Avg Acquisition lt b 0mA 3 3V without ext antenna Avg Tracking lt 48mA 3 3V without ext antenna Environment 23 Temperature Operating 40 85 C Storage 40 85 24 Humidity lt 95 GS 2525 1 5 Application Circuit J1 RF MCX JACK 43 3V Ut GND anp HS RA RF_IN GND 1 ND GND 13 10 IN GND wi s RS a 20 HF OUT O TuFXGR 16V V 3V3 21 10 ae 27 V 6 Z GPS 1010 9 10 GPIO 14 OGPS_1014 3 3V_BAT Always GPS 101 9 24 GPIO 1 RB BA A A220 SYSTEM A GPS IO4 9 2
13. he GPS receiving performance 1 Solar control filmed windows ii Metal shielded such as umbrella or in vehicle iii Among high buildings iv Under bridges 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 D Ifthe satellite signals can not be locked or encounter receiving problem while in the urban area the following steps are suggested i 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 iii Move the GPS receiver away from the interferences resources iv Wait until the weather condition is improved E 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 22 GS 2525 31 Package Specification and Order Information Shipment Method Tape and reel Figure 3 1 Package Specifications 3 2 Lead Free Standard Reflow Profile Ramp down Ramp up 6 C sec 3 C sec max Ts Pretest 60 180sec 4 T25 C to peak 480 sec max Time GS 2525 Lead Free Standard Reflow Profile 23 RoyalTek 5 02 KAENI 4 Contact Information Section Contact sales roy
14. mm E W Indicator W E east or W west Speed Over Ground 0 13 knots 20 Course Over 309 62 degrees GS 2 52 5 Ground Date 120598 ddmmyy Magnetic Variation degrees E east or W west Mode A A Autonomous D DGPS E DR Checksum 10 2 1 6 VTG Course Over Ground and Ground Speed Table 2 10 contains the values of the following example GPVTG 309 62 T M 0 13 0 2 K 6E Table 2 10 VTG Data Format Name Example Units Description Message ID GPVTG VTG protocol header Course 309 62 degrees Measured heading Reference T True Course degrees heading Reference M Magnetic Speed 0 13 knots Measured horizontal speed Units N Knots Speed 0 2 km hr Measured horizontal speed Units K Kilometer per hour Mode A A Autonomous D DGPS E DR Checksum CR LF End of message termination 21 GS 2525 3 GPS Receiver User s Tip A GPS signal will be affected by weather and environment conditions thus suggest to use the GPS receiver under less shielding environments to ensure GPS receiver has better receiving performance B When GPS receiver is moving it will prolong the time to fix the position so suggest to wait for the satellite signals to be locked at a fixed point when first power on the GPS receiver to ensure to lock the GPS signal at the shortest time C The following situation will affect t
15. r active antenna If using 2 85V active antenna pin 20 has to be connected 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 100 and voltage 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 GS 2525 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 GS 2525 2 Software Interface 2 1 NMEA V3 0 Protocol Its output signal level is TTL 4800 bps default 8 bit data 1 stop bit and no parity It supports the following NMEA 0183 Messages GGA GLL GSA GSV RMC and VTG 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 GLL Geographic position latitude longitude
16. r board is the newest generation of Gstar GPS module The module is pow ered by latest Star single chip and Gsatr proprietary navigation technol ogy 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 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 Star Ill 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 and MSAS support Auto recovery while RTC crashes Trickle power supported Build in LNA and saw filter 11 Product applications Automotive navigation Personal positioning and navigation Marine navigation gt Timing application 1 2 Product Picture GS 2525 16 Pin 30 gt GS 2525 4 15 4 Pini Figure 1 1 REB 3571LP Front View GS 2525 Interface Board Compatible with REB 3300 interface board 9 is gt Figure 1 2 15 2525 Interface Board Front View Table 1 1 The interface board pin definition
17. ral 35V 2V4 2 2 0V 0 3V V 0 86V purpose I O 2 85 2 V 2 14V Vo 0 71V 27 GPIO 13 General 3 15V 2 2 0V 0 3V V 0 86V purpose 2 85 gt 2 14V Vo 5 28 GPIO 15 I O General 3 15V 2 Vy 2 2 0V 0 3V lt 0 867 purpose l O 2 85 2 Voy 2 14V Vo lt 29 PPS One pulse per 3 15V 2 V 2 2 0V 0 3V lt Vz 0 86V second 30 GND Ground Reference Ground Definition of Pin assignment VCC_3V3 3 3V DC power Input GS 2525 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 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 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 ON This pin indicates state of RF voltage GPS 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 500 V ANT IN This pin is reserved as external DC power supply input fo
18. to the antenna or antenna connector of your choice Impedance 500 5 Power Connect VCC_3V3 pin to DC 3 3V The power supply must add bypassing capacitor 10uF and 0 1uF It can reduce the Noise from power supply and GS 2525 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 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 Recommended layout PAD 25 4000nn P17 190 1 1 900 P19 13000nn P20 2920 127 D 12770 if oe P29 a P26 ton P27 idi P28 127 P29 15000 Figure 1 7 Recommended Layout Pad GS 2525 P1 4 1 9000 P13 P12 19000 Pit P10 a 12770nn P6 E 127 P3 E 1277n k 127
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