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GPS Engine Board Manual SR-92 Manual V1.0 SSSSRRRR-92-92-92-92 SIRF STAR ⅢⅢⅢⅢ V 1.0 Easy to Use Ultra-High Performance GPS Smart Antenna Module With Power Control Made in Taiwan 2008/08/08 service@dagamagps.com www.dagamagps.com FREE SERVICE HOT-LINE(FOR MAINLAND):400-820-1322

SR-92 Manual V1.0 Contents Specifications subject to change without prior notice! 1 Introduction ……….………………………………………………………………..... 1 1.1 1.2 1.3 1.4 1.5 OVERVIEW............................................................................................................ 1 MAIN FEATURES................................................................................................... 1 RECEIVER SPECIFICATIONS...................................................................................2 PROTOCOLS.......................................................................................................... 3 ANTENNA............................................................................................................. 3 2 Hardware Interface ………………………………………………………………..... 4 2.1 2.2 2.3 2.4 2.4.1 2.4.2 2.4.3 2.4.4 MODULE DIMENSION........................................................................................... 4 PIN ASSIGNMENT..................................................................................................4 MODULE PLACEMENT.......................................................................................... 4 POWER SAVING.....................................................................................................5 Power Saving of Trickle Power............................................................................5 Power Saving of Adaptive Trickle Power............................................................ 5 Power Saving of Push To Fix............................................................................... 5 Power Saving of Power Switch............................................................................ 6 3 Software Interface ………………………….......………………………………………7 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 NMEA OUTPUT MESSAGES.................................................................................7 GPGGA - GLOBAL POSITIONING SYSTEM FIX DATA...........................................8 GPGLL - GEOGRAPHIC POSITION - LATITUDE / LONGITUDE............................... 8 GPGSA - GNSS DOP AND ACTIVE SATELLITES..................................................9 GPGSV - GNSS SATELLITES IN VIEW................................................................. 9 GPRMC - RECOMMENDED MINIMUM SPECIFIC GNSS DATA............................ 10 GPVTG - COURSE OVER GROUND AND GROUND SPEED................................... 10 GPZDA - SIRF TIMING MESSAGE..................................................................... 11 Electrical and Environmental Data ……………………………………………...…. 12 Application …………………………………………………………………………..... 13 4 5 1 SR-92 User’s Manual V1.0

SR-92 Manual V1.0 1 Introduction 1.1 Overview SR-92 is a low-power, ultra-high performance, easy to use GPS smart antenna module based on SiRF’s third generation single chip. Its low power consumption and high performance enables the adoption of handheld applications. The slim design allows SR-92 to be placed on topside of the housing to have best GPS signal reception. The 5-pin I/O interface is then connected to the main board with either connector or wire soldering. The integrated antenna design helps reduce the RF and EMI issues to minimum. Fast adoption and high yield production becomes possible. The power control It’s especially useful in cases such as to turn off power as the user just wants to watch a movie and GPS function is not needed in the PMP case. to turn on/off power via GPIO control pin. feature is very convenient 1.2 Main Features Not only handheld but also any other GPS applications can share the following major features of SR-92. Easy adoption with best performance Integrated antenna and EMC protection Built-in backup battery allowing hot/warm starts and better performance No external component demand, just connect and use. Minimum RF and EMI efforts Small size of 18 (W) x 21 (L) x 7 (H) (mm) with patch antenna of 18x18x4mm. Fully implementation of ultra-high performance SiRF StarⅢ single chip architecture High tracking sensitivity of -159dBm Low power consumption of 40mA at full tracking Hardware power saving control pin allowing power off GPS via GPIO SR-92 could be arranged at best reception location inside housing Firmware upgradeable for future potential performance enhancements 1 SR-92 User’s Manual V1.0

1.3 Receiver Specifications SR-92 Manual V1.0 Features Specifications GPS receiver type Horizontal Position Accuracy Velocity Accuracy Time accuracy TTFF (Time to First Fix) (50%, -130dBm, autonomous) Sensitivity (Autonomous) Measurement data output Max. Altitude Max. Velocity SBAS Support Dynamics Power consumption Power supply Dimension (single side) Operating temperature Storage temperature 20 channels, L1 frequency, C/A code < 2.5m (Autonomous) < 2.0m (WAAS) (50% 24hr static, -130dBm) <0.01 m/s (speed) <0.01° (heading) (50%@30m/s) 1µs or less Hot Start: 1s Warm Start: 35s Cold Start: 42s Tracking: –159dBm Acquisition: -142dBm Update time: 1 second NMEA output protocol: V.3.00 Baud rate: 4800 (default), 9600, 19200, 38400, 57600 bps (8-N-1) Datum: WGS-84 Default: GGA, GSA, RMC, and GSV Other options: VTG, GLL, ZDA, or SiRF binary <18,000 m <1,852 km/hr WAAS, EGNOS <4g 40mA, continuous tracking mode 3.3V 18 (W) x 21 (L) x 7 (H) mm w/ 18x18x4 (mm) patch antenna -40°C ~ +85°C -40°C ~ +125°C 2 SR-92 User’s Manual V1.0

SR-92 Manual V1.0 1.4 Protocols Both NMEA and SiRF binary protocols could be supported via serial UART I/O port – RXA/TXA. The default supported protocol is NMEA protocol. 1. Serial communication channel i. ii. No parity, 8-data bit, 1-stop bit (N-8-1) User selectable factory set baudrate among 4800, 9600, 19200, 38400, and 57600 (default 4800) bps. 2. NMEA 0183 Version 3.00 ASCII output i. ii. Default GGA (1 sec), GSA (1 sec), GSV (3 sec), RMC (1 sec) Optional VTG, GLL, ZDA 1.5 Antenna SR-92 has a built-in patch antenna of dimension 18x18x4mm. To have the best performance, we suggest tuning the RF antenna together with product’s outside shell of housing. 3 SR-92 User’s Manual V1.0

2 Hardware Interface 2.1 Module Dimension SR-92 Manual V1.0 The dimension of SR-92 is 18 mm (W) x 21 mm (L) x 7 mm (H) with a patch antenna of 18x18x4mm. 2.2 Pin Assignment 5-pin Interface Pin 1 Name GND Ground Function 2 3 4 5 VCC Power supply of 3.3 ~ 5.5 VDC TX RX PWR_CTRL Port A serial data output (GPS out); N-8-1, NMEA v3.00 output Port A serial data input (GPS in); N-8-1, accepts commands from external applications, e.g. SiRFDemo. Hardware controlled power saving pin. If this function is used, it is usually connected to a GPIO pin of a micro-processor. “Low”: for normal run “High” or floating: turn off VCC for power saving Tie it to low if this pin is not used. 4 I/O Input Input Output Input Input 2.3 Module Placement The SR-92 module could be placed on any location of your product’s housing that has best signal reception. The 5-pin interface is then connected to your motherboard. There are two items that extrude the bottom PCB plane of SR-92. It may affect the placement of SR-92 into your product’s housing. 1. The antenna is soldered to SR-92 at the bottom via one soldering point. The soldering extrudes the bottom PCB plane of SR-92. It is suggested to reserve a hole of j = 2 mm and depth of 1mm on the under housing. 2. The built-in battery is also soldered to SR-92 at the bottom via two soldering points. The soldering extrudes the bottom PCB plane of SR-92. 4 SR-92 User’s Manual V1.0

SR-92 Manual V1.0 2.4 Power Saving SR-92 supports various kinds of power saving mechanisms – Trickle Power, Adaptive Trickle Power, Push To Fix, and power switch. The first three kinds of power saving mechanisms are implemented in software and the power switch mechanism is implemented in hardware. 2.4.1 Power Saving of Trickle Power The trickle power saving mechanism is achieved by switching off and on CPU and RF at a fixed time interval. The biggest time interval to report a position is 10 seconds. The on and off ratio is configurable. This feature is useful for applications that need to report position regularly while power saving is significant. This feature is done by firmware automatically if this feature is enabled. The standard firmware does not turn on this feature. It could be customized by request of MOQ. 2.4.2 Power Saving of Adaptive Trickle Power The adaptive trickle power saving mechanism is basically the same as trickle power saving mechanism with difference that it would not turn the power off if the signal quality is not good enough for tracking. Thus, it keeps both benefits of performance and power saving intelligently. This feature is done by firmware automatically if this feature is enabled. The standard firmware does not turn on this feature. It could be customized by request of MOQ. 2.4.3 Power Saving of Push To Fix The Push To Fix power saving mechanism will not report position data until a specified time interval expires or triggered by external event. Typically, to keep the up to date position data, it would wake up to collect ephemeris and almanac data every 30 minutes. The time interval is also configurable. This mechanism is especially useful for applications that need position data only on demand. This feature is done by firmware automatically if this feature is enabled. The standard firmware does not turn on this feature. It could be customized by request of MOQ. 5 SR-92 User’s Manual V1.0

SR-92 Manual V1.0 2.4.4 Power Saving of Power Switch The Power Switch power saving mechanism will turn off not only the CPU and RF but also the whole engine board. In the mean time, the backup battery will start to power GPS’s RTC and internal memory for better performance. The power saving is controlled by the external application via the control pin (PWR_CTRL; pin 5). The engine board will be on if PWR_CTRL pin is low. It would be off if the pin is high or floating. The designer has full control of the power supply status of the smart antenna. The power saving is also more complete. Applications such as PMP navigator may prefer to stop GPS while it just runs movie watching. There might be similar demand for different applications. This mechanism is achieved by hardware and external control of pin PWR_CTRL is required if this mechanism is used. Tie this pin to low if the mechanism is not used. 6 SR-92 User’s Manual V1.0

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