RGPSM002WA

RGPSM002 GPS Receiver RGPSM002 GPS Receiver Module Ultra Low Power Position-Velocity-Time Platform GENERAL DESCRIPTION KEY FEATURES The ultra low power RGPSM002 GPS Receiver is a fully autonomous module that provides position, speed and time information derived from the Global Positioning System. The module shows high position and speed accuracy performances as well as high sensitivity and tracking capabilities in urban canyon conditions. They can easily be interfaced with any application controller through a simple serial interface. The solutions come in a small form factor package that facilitates integration into portable equipment. The RGPSM002 delivers major advancements in GPS performances, accuracy, integration, computing power and flexibility. It is designed to simplify the embedded system integration process. • High sensitivity: to -143 dBm tracking, superior urban canyon performances • Position accuracy: < 5m CEP (50%) without SA (horizontal) • Warm Start is under 32 seconds (50%) • Hot Start is under 12 seconds (50%) • Ultra low power: 19 mA @ 3V full power, 3 additional low power modes • Embedded ARM7TDMI • Small form factor and low cost solution • Ready-to-plug solution, fully autonomous PVT solution. Easily integrated into existing systems • On-board RAM for GPS navigation data, on-board Flash memory back-up • PPS output APPLICATIONS • Bidirectional NMEA interface • • • • • • Real Time Clock with separate back-up power supply The RGPSM002 is based on the mixed hardware/software architecture supported by the Semtech XE1610 GPS chipset. Automotive Fleet management/asset tracking Palmtop, Laptop, PDA Location Based Services enabled devices Handheld receivers REFERENCE RGPSM002 – 16M Flash version Rev 1 August 2005 www.semtech.com 1 RGPSM002 GPS Receiver Table of Contents 1 FIRSTGPS ARCHITECTURE HIGHLIGHTS 1.1 Industry Leading GPS Performance 1.2 Low Power 1.3 RGPSM002 GPS Receiver Highlights 2 FUNCTIONAL BLOCK DIAGRAM 3 3 3 3 3 3 4 PIN DESCRIPTION 4 TECHNICAL CHARACTERISTICS 4.1 Specifications 4.2 Physical Characteristics 4.3 Mechanical Interface 4.3.1 RF Interface Connector 4.3.2 Data Interface Connector 5 INTERFACE DEFINITION, PRINCIPLES OF OPERATION 5.1 Data Interface 5.2 Operating Modes 5.2.1 Operating the GPS receiver in a basic “stand-alone” configuration 5.2.2 Operating the GPS receiver in a basic “serial, bidirectional” configuration 5.3 NMEA Standard Message Set Specification 5.3.1 NMEA Standard Sentences 5.3.2 GGA —Global Positioning System Fixed Data 5.3.3 GLL—Geographic Position - Latitude/Longitude 5.3.4 GSA—GNSS DOP and Active Satellites 5.3.5 GSV—GNSS Satellites in View 5.3.6 RMC—Recommended Minimum Specific GNSS Data 5.3.7 VTG—Course Over Ground and Ground Speed 5.3.8 ZDA—Time & Date 5.3.9 GPQ—NMEA Sentence Query 5.4 NMEA Specific Sentences 5.4.1 DI – Diagnostic Message 5.4.2 TF—Quick Test 5.4.3 NM – Sentence Mask and Automatic Output Rate 5.4.4 PS – Pulse-Per-Second Configuration 5.4.5 PT – Port Configuration 5.4.6 RT – Reset the Receiver / Start-Stop FirstGPS 5.4.7 VR – Version Information 5.4.8 GS – Geodetic System Configuration 5.4.9 LP – Power Save Mode 5.4.10 TR – Transparent Mode 5.5 GPS Data Back-up 5.6 Real Time clock 5.7 Split Search Mode 5.8 Hardware Reset and System Watchdog 6 DEFAULT SETTINGS 6.1 GPS Engine Configuration 6.1.1 Receiver configuration 6.1.2 Filter configuration 6.1.3 Offset configuration 6.1.4 Application settings 7 APPLICATION INFORMATION 7.1 Active Antenna © Semtech 2005 4 4 5 5 5 5 6 6 7 8 8 9 9 9 10 10 11 12 12 13 13 14 14 14 15 16 16 16 17 17 18 18 21 21 21 21 22 23 23 23 23 23 23 23 www.semtech.com 2 RGPSM002 GPS Receiver 1 FIRSTGPS ARCHITECTURE HIGHLIGHTS 1.1 1.2 1.3 INDUSTRY LEADING GPS PERFORMANCE Builds on high performance FirstGPS core Satellite signal tracking engine to perform GPS acquisition and tracking functions without CPU intervention High sensitivity: to -143 dBm tracking, superior urban canyon performances Position accuracy: < 5m CEP (50%) without SA (horizontal) Warm Start is under 32 seconds (50%) Hot Start is under 12 seconds (50%) Timing output accuracy: +/- 100 ns LOW POWER - Ultra low power integrated circuit design, optimized RF and DSP architectures, 19 mA @ 3V tracking/doing fixes - Further power saving thanks to 3 different power down modes o Power Save – RF section and GPS engine turned Off o Stand-by – RF section, GPS engine, and MCU clock turned Off, main power supply On, RTC running o Power down - RF section, GPS engine, and MCU clock turned Off, main power supply Off, RTC running on the back-up supply RGPSM002 GPS RECEIVER HIGHLIGHTS Embedded AT91 MCU, ARM7TDMI-based Small form factor Low cost Ready-to-plug solution, fully autonomous PVT solution. Easily integrated into existing systems High signal acquisition & tracking performances On-board RAM for GPS navigation data. On-board Flash memory is used to back-up data such as the Almanac - PPS output - On-board RTC can be supplied by a separate back-up power supply if the main supply is turned off. - Application software can be customized for high volume applications (Flash memory) - 2 FUNCTIONAL BLOCK DIAGRAM ANT Q LPF RF+ BP FILTER BP FILTER RF- XE1610-OEMPVT APPLICATION I RF DOWNCONVERTER LNA Active Antenna I LPF Q MCLKI SCLK TCXO GPS BASEBAND PROCESSOR RX TX API PVT BOARD INTERFACE FirstGPS SOFTWARE RTOS XE1610-OEMPVT © Semtech 2005 www.semtech.com 3 RGPSM002 GPS Receiver 3 PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 NAME GND ON/OFF VCC USPED RXA VRTCBK TXA PPS GND RESETN ALMRDY STY1 I I I O O I O O DELPOSN I STANDBYN I DESCRIPTION Power and Signal Ground ON / Off command line 3.0 to 3.6 Volts DC Input Power Supply UART Speed Serial Receive Data, Port A, GPS NMEA Data Back-up supply for the RTC Serial Transmit Data, Port A, GPS NMEA Data One Pulse Per Second timing output Power and Signal Ground Manual Reset, Active low Almanac full and up to date, output Search/Track mode indicator output N.C. Delete Initial Position N.C. Stand-by (Active Low) Table 1 – Pin description 4 4.1 TECHNICAL CHARACTERISTICS SPECIFICATIONS Description Receiver Correlators/Channels Update Rate Satellite Reacquisition Time Hot Start Warm Start Cold Start Tracking Sensitivity Power Consumption (VCC) @ 3.3V • Active mode, searching & tracking • Power save mode • Stand-by mode • Power down mode Voltage Supply VCC Back Up Voltage Supply VRTCBK Output Protocol Position Accuracy • Horizontal, SA off • DGPS corrected Timing output accuracy PPS output (rising edge) Min. 1/minute Typ. L1, C/A code 32/8 1/second 1 second 12 seconds (50%) 32 seconds (50%) 120 seconds (50%) -173 dBW Max. 1/second 19 mA 2.2 mA 400 uA 2 uA 3V 1.9V 3.3V 3.65V 3.65V NMEA 0183, v3.0 5 meters CEP (50%) 1 meter - 100 nanosec. © Semtech 2005 100 nanosec. www.semtech.com 4 RGPSM002 GPS Receiver Description Input voltage – data interface Output voltage, VCC = 3V, I = 2mA Min. Low High Low High Typ. Max. 0.8V 2.0V 0.4V 2.6V Table 2 – Electrical specifications 4.2 PHYSICAL CHARACTERISTICS The RGPSM002 is 26.59 x 31.59 x 11.2 mm module. 4.3 MECHANICAL INTERFACE 4.3.1 RF Interface Connector Subminiature HFL. Works with 3.0V active antenna 4.3.2 Data Interface Connector 16 contact board-to-board flat cable connector. Ref: Fujikura DDK FF6-16A-R15 or equivalent © Semtech 2005 www.semtech.com 5 RGPSM002 GPS Receiver 5 INTERFACE DEFINITION, PRINCIPLES OF OPERATION 5.1 DATA INTERFACE VCC – This is the main power supply GND – This is the power and signal ground VRTCBK – This is the back-up supply for the on-board hardware Real Time Clock All I/Os on the Data Interface are related to VCC and GND levels. ON/OFF - The ON/OFF input pin controls whether the GPS engine is turned ON or OFF. If this pin is “high” whenever a reset condition occurs or if it is turned “high” when in operation, then the GPS engine is turned on. If this pin is “low” whenever a reset condition occurs then the GPS engine is not started. If this pin is turned “low” when in operation then the GPS engine is turned off. When ON/OFF is “low”, the on/off state can be superseded with the PXEMaRT manufacturer specific NMEA sentence on RXA, as defined hereafter. This input pin has a pull-up resistor. RXA – Serial Receive data. This input pin has a pull-up resistor. TXA – Serial Transmit data USPED – Hardware Baudrate selection The Serial NMEA data port (lines RXA and TXA) is an asynchronous serial port (UART). Upon reset, if the USPED input pin is “low” the setting for this port is defined by the set A of UART parameters #19 to #22 in the Default Parameters Table *, or if USPED is “high” the setting is defined by the set B #23 to #26. This setting can be modified with the PXEMaPT manufacturer specific NMEA sentence defined hereafter. This input pin has a pull-up resistor. There is no flow control on the UART. (*) see the Default Settings section below PPS - The PPS output pin is a Pulse Per Second highly accurate timing signal generated by the on-board GPS baseband processor. The PPS signal is available only when the receiver does position fixes. Otherwise its output level is “low”. After a reset condition, the setting for this port is defined in the Default Parameters Table *, parameter #1. This setting can be modified with the PXEMaPS manufacturer specific NMEA sentence defined hereafter. (*) see the Default Settings section below 1 second ~ 83 ms. Figure 1 – PPS timing diagram The rising edge of the PPS signal is synchronous with the GPS time. RESETN – Manual Reset input pin. The receiver has 2 reset conditions: first, on power-on, thanks to an on-board Power On Reset circuitry; and an external reset when the RESETN pin is “low”. This input pin has a pull-up resistor. ALMRDY – When in Active mode, this output indicates the on-board Almanac status. Upon start up and whenever the Almanac data are tested invalid or not up-to-date the output level is “low. If tested valid and up-to-date the output level is “high”. STANDBYN – This input sets the receiver in Stand-by mode when its level is “low”. Otherwise the receiver is either in Active or Power Save modes. See below, under Operating modes for details. This input pin has a pull-up resistor. DELPOSN – Delete Initial Position pin. When set “low” for less than 1.5 seconds, this allows deleting of the initial position in the RAM portion of the MCU and triggering re-computation of the tracking set. The position will not be deleted if GPS fixes are already being generated. This function is useful when the initial position is known to be incorrect, for example when the receiver is powered down, put on a plane, flown 20,000 km, and then warm-started. See timing information in the figure below. This input pin has a pull-up resistor. © Semtech 2005 www.semtech.com 6 RGPSM002 GPS Receiver ‘Delete Initial Position’ Request (Delay > 100 ms,