Product name Description Version ST-1612 Datasheet of ST-1612 GPS module 0.5 1 Introduction LOCOSYS ST-1612 is a GPS and GLONASS module that features high sensitivity, faster location fix. This GPS module is powered by STMicroelectronics, it can provide you with superior sensitivity and performance even in urban canyon and dense foliage environment. 2 Features STMicroelectronics TeseoII TM family single chip solution. Support GPS/GLONASS/GALILEO/QZSS navigation systems. Built-in 3-state jammer barrier. Support of ST-AGPSTM Multimode Assisted GPS (extended ephemeris solution) Manufactured complied with ISO/TS 16949. Capable of SBAS (WAAS, EGNOS). Wide ambient temperature range: -40/+85 C 0.5ppm TCXO for optimal performance. 3 Application Personal positioning and navigation. Automotive navigation. Marine navigation. 2011 Page 1/16
3.1 Block Diagram Fig 3-1 System block diagram 3.2 Passive Antenna Design: Fig 3-2 Passive antenna reference design Note: 1. All components are reference only; this reference design may or may not be applicable in all cases. 2. Use a 200mA with high PSRR and short circuit current fold back LDO regulator is highly recommended. 3. It is recommended to keep RF trace short. if possible, keep T type matching network between antenna and RFIN(pin 11). 2011 Page 2/16
3.3 Active Antenna Design: Fig 3-3 Active antenna reference design Note: 1. All components are reference only; this reference design may or may not be applicable in all cases. 2. Use a 200mA with high PSRR and short circuit current fold back LDO regulator is highly recommended. 3. It is recommended to keep RF trace short. if possible, keep T type matching network between RF connector and RFIN(pin 11). 4.If use VOUT (pin 9) to power external active antenna, choose right resistor(r_bias) to prevent inductor(l) from burning up. 2011 Page 3/16
3.4 Active Antenna Design: 2011 Page 4/16
4 GPS specification GPS Chip STMicroelectronics high quality chip Frequency Channels Update rate Sensitivity GPS: L1 1575.42MHz, C/A code GLONASS: L1 1598.0625MHz ~ 1605.375MHz, C/A code 32 tracking channels 1Hz Tracking 1 Cold start Up to -161dBm with an external 1 stage LNA -146dBm Hot start (Open Sky) < 2s Acquisition Time Warm start (Open Sky) < 25s Cold Start (Open Sky) 35s Position Accuracy Autonomous < 1.5m (CEP) Max. Altitude Max. Velocity 18000 m ( 60000 ft ) max 515 m/sec (1000 knots) max Protocol Support NMEA 0183 ver 3.0 Note: 1) The lowest level at which the GPS receiver reliably tracks at least one satellite. 9600 bps, 8 data bits, no parity, 1 stop bits (default) 1Hz: GGA, GLL, GSA, GSV, RMC, VTG 2011 Page 5/16
5 Software interface 5.1 NMEA output message Table 5.1-1 NMEA output message NMEA record GGA GLL GSA GSV RMC VTG Global positioning system fixed data Geographic position - latitude/longitude GNSS DOP and active satellites GNSS satellites in view Recommended minimum specific GNSS data Course over ground and ground speed Description GGA - Global Positioning System Fixed Data Table 5-2 contains the values for the following example: $GPGGA,231611.000,6907.732,N,10503.975,W,1,16,0.6,142.7,M,-25.7,M,,*66 Table 5-2 GGA Data Format Name Example Units Description Message ID $GPGGA GGA protocol header UTC Time 231611 hhmmss.sss Latitude 6907.73 ddmm.mmmm N/S indicator N N=north or S=south Longitude 10503.97 dddmm.mmmm E/W Indicator W E=east or W=west Position Fix Indicator 1 See Table 5-3 Satellites Used 16 Range 0 to 24 HDOP 0.6 Horizontal Dilution of Precision MSL Altitude 142.7 mters Units M mters Geoid Separation -25.7 mters Range -9999.9 to 9999.9 Units M mters Age of Diff. Corr. second Null fields when DGPS is not used Diff. Ref. Station ID Null fields when Reference Station ID is not used Checksum *66 <CR> <LF> End of message termination 2011 Page 6/16
Table 5-3 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 GLL - Geographic Position Latitude/Longitude Table 5-4 contains the values for the following example: $GPGLL,6907.733,N,10503.974,W,231609.000,A*2B Table 5-4 GLL Data Format Name Example Units Description Message ID $GPGLL GLL protocol header Latitude 6907.73 ddmm.mmmm N/S indicator N N=north or S=south Longitude 10503.97 dddmm.mmmm E/W indicator W E=east or W=west UTC Time 231609 hhmmss.sss Status A A=data valid or V=data not valid Checksum *2B <CR> <LF> End of message termination Message ID $GPGLL GLL protocol header GSA - GNSS DOP and Active Satellites Table 5-5 contains the values for the following example: $GNGSA,A,3,69,70,08,24,92,21,15,06,75,65,28,73,1.2,0.6,1.1*2A Table 5-5 GSA Data Format Name Example Units Description Message ID $GNGSA GSA protocol Mode 1 A See Table 5-6 Mode 2 3 See Table 5-7 ID of satellite used 69 Sv on Channel 1 ID of satellite used 70 Sv on Channel 2.. ID of satellite used 73 Sv on Channel 12 PDOP 1.2 Position Dilution of Precision HDOP 0.6 Horizontal Dilution of Precision VDOP 1.1 Vertical Dilution of Precision Checksum *2A <CR> <LF> End of message termination 2011 Page 7/16
Table 5-6 Mode 1 Value M A Description Manual- forced to operate in 2D or 3D mode Automatic-allowed to automatically switch 2D/3D Table 5-7 Mode 2 Value Description 1 Fix not available 2 2D 3 3D GSV - GNSS Satellites in View Table 5-8 contains the values for the following example: $GNGSV,6,1,22,03,23,036,40,06,22,022,40,07,45,081,,08,63,151,40*62 $GNGSV,6,2,22,10,53,217,,15,24,271,40,19,08,067,40,21,27,326,40*62 $GNGSV,6,3,22,24,30,276,40,25,27,070,40,26,41,260,,27,46,203,*62 $GNGSV,6,4,22,28,11,154,40,65,18,308,39,69,65,144,39,70,67,278,39*66 $GNGSV,6,5,22,73,06,053,39,75,21,195,38,76,39,048,35,86,00,136,*66 $GNGSV,6,6,22,92,26,313,38,13,00,000,40,,,,,,,,*64 Table 5-8 GSV Data Format Name Example Units Description Message ID $GNGSV GSV protocol header Total number of messages 1 6 Range 1 to 6 Message number 1 1 Range 1 to 6 Satellites in view 22 Satellite ID 03 Channe01(Range 01 to 99) Elevation 23 degrees Channe01 (Range 00 to 90) Azimuth 036 degrees Channe01(Range 000 to 359) SNR (C/No) 40 db-hz Channe01(Range 00 to 99, null when not tracking)... Satellite ID 08 Channe04(Range 01 to 99) Elevation 63 degrees Channe04 (Range 00 to 90) Azimuth 151 degrees Channe04(Range 000 to 359) SNR (C/No) 40 db-hz Channe04(Range 00 to 99, null when not tracking) Checksum *62 <CR> <LF> Note: End of message termination 1) Depending on the number of satellites tracked, multiple messages of GSV data may be required. 2011 Page 8/16
RMC - Recommended Minimum Specific GNSS Data Table 5-9 contains the values for the following example: $GPRMC,231610.000,A,6907.732,N,10503.974,W,1.0,180.2,070611,0.0,W*67 Table 5-9 RMC Data Format Name Example Units Description Message ID $GPRMC RMC protocol header UTC Time 231610 hhmmss.sss Status A A=data valid or V=data not valid Latitude 6907.73 ddmm.mmmm N/S Indicator N N=north or S=south Longitude 10503.97 dddmm.mmmm E/W Indicator W E=east or W=west Speed over ground 1 knots True Course over ground 180.2 degrees Date 070611 Ddmmyy Magnetic variation 0.0 degrees Variation sense W E=east or W=west (Not shown) Checksum *67 <CR> <LF> End of message termination VTG - Course Over Ground and Ground Speed Table 5-10 contains the values for the following example: $GPVTG,180.2,T,,M,1.0,N,1.8,K*63 Table 5-10 VTG Data Format Name Example Units Description Message ID $GPVTG VTG protocol header Course over ground 180.2 degrees Measured heading Reference T True Course over ground degrees Measured heading Reference M Magnetic Speed over ground 1.0 knots Measured speed Units N Knots Speed over ground 1.8 km/hr Measured speed Units K Kilometer per hour Checksum *63 <CR> <LF> End of message termination 2011 Page 9/16
5.2 Proprietary NMEA input message Command $PSTMCOLD<CR><LF> $PSTMWARM<CR><LF> $PSTMHOT<CR><LF> Description Perform a COLD start. Perform a WARM start. Perform a HOT start. 6 Pin assignment and descriptions Fig 6-1 Pin Assignment(Top View) 2011 Page 10/16
Table 6-1 Pin descriptions Pin Name Type Description 1 RESERV Reserved; keep floating 2 NC Reserved; keep floating 3 TIMEMARK O 1 PPS output 4 NC Not connected 5 USB_DM 2 USB DATA ( Optional ) 6 USB_DP 2 USB DATA ( Optional ) 7 NC Not connected 8 NC Not connected 9 VOUT 1 P Same voltage as pin 23 10 GND P Ground 11 RFIN RF GPS/GLONASS signal input 12 GND P Ground 13 GND P Ground 14 RESERV Reserved; keep floating 15 RESERV Reserved; keep floating 16 NC Not connected 17 NC Not connected 18 RESERV Reserved; keep floating 19 RESERV Reserved; keep floating 20 TXD O CMOS level asynchronous output for UART 21 RXD I CMOS level asynchronous input for UART 22 VSTBY P Standby Backup Battery Input ( 1.5 3.6VDC ) 23 VCC P Main power input ( 3.0 3.6VDC ) 24 GND P Ground Note: 1) If use VOUT (pin 9) to power external active antenna, choose right resistor(r_bias) to prevent inductor(l) from burning up. 2) Demand on request. 2011 Page 11/16
7 DC and Temperature characteristics 7.1 Absolute maximum ratings Parameter Symbol Ratings Units Input Voltage VCC 5 V Input Backup Battery Voltage V STBY 3.6 V 7.2 DC Electrical characteristics Parameter Symbol Conditions Min. Typ. Max. Units Input Voltage VCC 3 3.3 3.6 V Standby Backup Battery Voltage V STBY 1.5 3.3 3.6 V Standby Backup Battery Current I STBY VCC = 0V 88 ua Output Voltage VOUT VCC V Supply Current @VCC = 3.3V Iss Peak Acquisition 60 Tracking 40 ma Logic Input High Level Voltage V IH 0.7*VCC VCC V Logic Input Low Level Voltage V IL 0 0.8 V Logic Output High Level Voltage V OH 0.8*VCC V Logic Output Low Level Voltage V OL 0.2*VCC V 7.3 Temperature characteristics Parameter Symbol Min. Typ. Max. Units Operating Temperature Topr -40 85 Storage Temperature Tstg -40 25 85 2011 Page 12/16
8 Mechanical specification 8.1 Outline dimensions Unit: mm 2011 Page 13/16
8.2 Recommended land pattern dimensions Unit: mm 2011 Page 14/16
9 Reel Packing information 10 Handling precautions 10.1 ESD sensitive device Follow the JESD625-A requirements for handling this module. 10.2 Disposal This module should not be treated as householder waste, please contact your local waste management authority to recycle this module. 2011 Page 15/16
Document change list Revision 0.1 First release on Dec. 29, 2011. Revision 0.2 First release on JAN. 16, 2012. Revision 0.3 First release on FEB.15, 2012. Revision 0.4 First release on MAR.7, 2012. Revision 0.5 First release on MAR.22, 2012. 2011 Page 16/16