RGPSM202

RGPSM202 SlimGPS™ Receiver RGPSM202 SlimGPS™ - GPS Receiver OEM Module GENERAL DESCRIPTION KEY FEATURES The RGPSM202 SlimGPS features the well ® established FirstGPS architecture. This autonomous GPS receiver solution provides high performances in terms of position and speed accuracy as well as sensitivity and tracking capabilities in urban conditions. • Small low profile form factor and low cost solution. Surface mount, ready-to-plug solution. Drop-in direct digital interface • Sensitivity to -143 dBm tracking • 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: 25 mA @ 3V full power, 3 additional low power modes • Embedded ARM7TDMI • 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 The solution enables small form factor package. It is designed to simplify the embedded system integration process. These modules are based on the Semtech XE1610 Ultra Low Power GPS chipset. APPLICATIONS • In-vehicle navigation systems • Car accessories • Asset management/tracking • Fleet management • PPS output • Palmtop, Laptop, PDA • Bidirectional NMEA interface • Location Based Services enabled devices • • Handheld receivers Real Time Clock with separate back-up power supply REFERENCE RGPSM202 – 16M Flash version Rev 1 August 2005 www.semtech.com 1 RGPSM202 SlimGPS™ Receiver Table of Contents FIRSTGPS ARCHITECTURE HIGHLIGHTS................................................................................................................3 1.1 Industry Leading GPS Performance......................................................................................................................3 1.2 Low Power .............................................................................................................................................................3 1.3 RGPSM202 SlimGPS Receiver Highlights............................................................................................................3 2 FUNCTIONAL BLOCK DIAGRAM ................................................................................................................................3 1 3 PIN DESCRIPTION.......................................................................................................................................................4 4 TECHNICAL CHARACTERISTICS...............................................................................................................................4 4.1 Specifications.........................................................................................................................................................4 4.2 Physical Characteristics.........................................................................................................................................5 4.3 Mechanical Interface..............................................................................................................................................5 4.4 Production Issues ..................................................................................................................................................6 4.4.1 Proposed Customer Solder Profile.................................................................................................................6 INTERFACE DEFINITION, PRINCIPLES OF OPERATION ........................................................................................6 5.1 Data/RF Interface...................................................................................................................................................6 5.2 Operating Modes ...................................................................................................................................................8 5.2.1 Operating the GPS receiver in a basic “stand-alone” configuration...............................................................8 5.2.2 Operating the GPS receiver in a basic “serial, bidirectional” configuration....................................................9 5.3 NMEA Standard Message Set Specification .......................................................................................................10 5.3.1 NMEA Standard Sentences..........................................................................................................................10 5.3.2 GGA —Global Positioning System Fixed Data ............................................................................................10 5.3.3 GLL—Geographic Position - Latitude/Longitude..........................................................................................11 5.3.4 GSA—GNSS DOP and Active Satellites......................................................................................................11 5.3.5 GSV—GNSS Satellites in View ....................................................................................................................12 5.3.6 RMC—Recommended Minimum Specific GNSS Data ................................................................................13 5.3.7 VTG—Course Over Ground and Ground Speed .........................................................................................13 5.3.8 ZDA—Time & Date .......................................................................................................................................14 5.3.9 GPQ—NMEA Sentence Query.....................................................................................................................14 5.4 NMEA Specific Sentences...................................................................................................................................15 5.4.1 DI – Diagnostic Message..............................................................................................................................15 5.4.2 TF—Quick Test ............................................................................................................................................15 5.4.3 NM – Sentence Mask and Automatic Output Rate ......................................................................................16 5.4.4 PS – Pulse-Per-Second Configuration .........................................................................................................17 5.4.5 PT – Port Configuration ................................................................................................................................17 5.4.6 RT – Reset the Receiver / Start-Stop FirstGPS ...........................................................................................17 5.4.7 VR – Version Information .............................................................................................................................18 5.4.8 GS – Geodetic System Configuration ..........................................................................................................18 5.4.9 LP – Power Save Mode................................................................................................................................19 5.4.10 TR – Transparent Mode ..............................................................................................................................19 5.5 GPS Data Back-up ..............................................................................................................................................22 5.6 Real Time clock ...................................................................................................................................................22 5.7 Split Search Mode................................................................................................................................................22 5.8 Hardware Reset and System Watchdog .............................................................................................................22 DEFAULT SETTINGS.................................................................................................................................................23 6.1 GPS Engine Configuration...................................................................................................................................24 6.1.1 Receiver configuration..................................................................................................................................24 6.1.2 Filter configuration ........................................................................................................................................24 6.1.3 Offset configuration ......................................................................................................................................24 6.1.4 Application settings.......................................................................................................................................24 APPLICATION INFORMATION ..................................................................................................................................24 7.1 Active Antenna.....................................................................................................................................................24 EXHIBIT A ...................................................................................................................................................................25 5 6 7 8 © Semtech 2005 www.semtech.com 2 RGPSM202 SlimGPS™ Receiver 1 FIRSTGPS ARCHITECTURE HIGHLIGHTS 1.1 - INDUSTRY LEADING GPS PERFORMANCE Builds on high performance FirstGPS core Satellite signal tracking engine to perform GPS acquisition and tracking functions without CPU intervention Sensitivity: to -143 dBm tracking, urban canyon capability 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 1.2 LOW POWER - Ultra low power integrated circuit design, optimized RF and DSP architectures, 25 mA @ 3V tracking/doing fixes - Further power saving thanks to different power down modes o Active – power save – RF section, GPS engine, and MCU turned ON, active antenna turned OFF o Low-power – RF section and GPS engine turned OFF, MCU clock turned ON o Power down - RF section, GPS engine, and MCU clock turned OFF, main power supply OFF, RTC running on the back-up supply 1.3 RGPSM202 SLIMGPS 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 (BBFlash) 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 GPS BASEBAND PROCESSOR RX TX API PVT BOARD INTERFACE FirstGPS SOFTWARE RTOS TCXO RGPSM202 XE1610-OEMPVT © Semtech 2005 www.semtech.com 3 RGPSM202 SlimGPS™ Receiver 3 PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 NAME TDI TCK TDO TMS RXDA DGND TXDA VCC DGND RFGND RFGND RFGND RFGND RF IN RFGND DELPOSN DGND VBKP PPS DGND DGND POSFIX (BT1) ALMRDY (BT0) BTM I I O I I O I I O O O I DESCRIPTION JTAG pin JTAG pin JTAG pin JTAG pin Serial Receive Data input Digital Ground Serial Transmit Data output DC Input Power Supply Digital Ground RF Ground RF Ground RF Ground RF Ground RF Input RF Ground Delete Initial Position Digital Ground RTC Battery back-up Pulse Per Second output Digital Ground Digital Ground Searching/Position fix indicator / Board Test Mode Sel Almanac complete & valid / Board Test Mode Sel Board Test Mode Table 1 – Pin description 4 4.1 TECHNICAL CHARACTERISTICS SPECIFICATIONS Description Min. Receiver Max. L1, C/A code Correlators/Channels Update Rate Typ. 32/8 1/minute Satellite Reacquisition Time 1/second 1/second 1 second HotStart 12 seconds (50%) Warm Start 32 seconds (50%) Cold Start 120 seconds (50%) Tracking Sensitivity -173 dBW © Semtech 2005 www.semtech.com 4 RGPSM202 SlimGPS™ Receiver Description Min. Typ. Power Consumption (VCC) @ 3 V • Active mode, searching & tracking • Active - power save mode • Low-power mode • Power down mode Max. 25 mA 20 mA 2.2 mA 2 uA Voltage Supply VCC 3V Back Up Voltage Supply VRTCBK 3.3V 1.0V Output Protocol 3.65V 3.65V NMEA 0183, v3.0 Position Accuracy • Horizontal, SA off • DGPS corrected Timing output accuracy PPS output (rising edge) Input voltage – data interface Low High Output voltage, VCC = 3V, I = 2 mA Low High 5 meters CEP (50%) 1 meter - 100 nanosec. 100 nanosec. 0.8V 2.0V 0.4V 2.6V Table 2 – Electrical specifications 4.2 PHYSICAL CHARACTERISTICS The dimensions of the RGPSM202 are 38 x 26.5 x 3 mm (approx. 1.49” x 1.04” x 0.12”) drop-in module. Weight is < 6 grams. This device has an operating temperature range between -40 and +85°C 4.3 MECHANICAL INTERFACE Surface mount, compatible with an SMD assembly line. The figure below shows the foot print for the module. This is a top view. The pin #1 is on top left. All dimensions in millimeters. Figure 1 – Footprint for the module © Semtech 2005 www.semtech.com 5 RGPSM202 SlimGPS™ Receiver Figure 2 Pad positions and pad details 4.4 PRODUCTION ISSUES The RGPSM202 module PCB is 1mm thick FR4 board. Its pin out uses castellation joints. It contains BGA components, has a shield around the edge. It is designed for a secondary re-flowed in customers manufacturing process. 4.4.1 Proposed Customer Solder Profile The customer solder profile choice is dictated by the solder profile used in the assembly process of the RGPSM202 module. In the Customer Solder Profile, it is recommended to use a solder content of 63% Tin and 37% lead, with a peak temperature of 200°C, but not exceeding 205°C maximum. 5 INTERFACE DEFINITION, PRINCIPLES OF OPERATION 5.1 DATA/RF INTERFACE VCC – This is the main power supply DGND – These are the power and signal ground pins for the digital / MCU section RFGND – These are the power and signal ground pins for the RF section VBKP – This is the back-up supply for the on-board hardware Real Time Clock RXDA – Serial Receive data. This input pin has a pull-up resistor. TXDA – Serial Transmit data © Semtech 2005 www.semtech.com 6 RGPSM202 SlimGPS™ Receiver PPS - The PPS output pin is 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. 1 second ~ 83 ms. (*) see the Default Settings section below Figure 3 – PPS timing diagram The rising edge of the PPS signal is synchronous with the GPS time. POSFIX – When in Active mode, this output indicates if the GPS receiver is in search mode (“high”/”low” square wave at 1Hz) or doing position fixes (“low”). 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”. DELPOSN – Delete Initial Position pin. When set “low” for less than 1.5 second, 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. ‘Delete Initial Position’ Request (Delay > 100 ms