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SR-90 Manual V1.0 GPS Engine Board Manual SSSSRRRR-90-90-90-90 SiRF StarⅢⅢⅢⅢ V 1.1 Made in Taiwan 2008/08/08 service@dagamagps.com www.dagamagps.com Free service hot-line(for mainland):400-820-1322

SR-90 Manual V1.0 Specifications subject to change without prior notice! Contents 1. Introduction ……………………………………………………..…………. 2 1.1 Overview …………………………………………………………………. 2 1.2 Features ……………………………………………………………………. 2 2. Technical Specifications …………………………………………………… 2 2.1. Electrical Characteristics…………………………………………………. 2 2.2. Environmental Characteristics……………………………………..……… 3 2.3. Physical Characteristics……………………………………………...…..… 4 Appendix: Software Specifications …………………………………….. 9 1 SR-90 User’s Manual V1.1

SR-90 Manual V1.0 1. Introduction 1.1 Overview SR-90 GPS module is a high performance receiver module for the Global Positioning System (GPS) solution. It combines SiRF StarⅢ GPS single chip, LNA circuit, SAW filter, oscillator, crystal and regulators into a land grid array module. The specified firmware is pre-loaded into the built-in 4-Mbit Flash memory of SR-90 for GPS application. It can be easily embedded into portable devices for GPS wireless communication. 1.2 Features SiRF starⅢ high performance GPS Chip Set Very high sensitivity (Tracking Sensitivity: -159 dBm) Extremely fast TTFF (Time To First Fix) at low signal level Compact size (25.4mm * 25.4 mm * 3.3mm) suitable for space-sensitive application One size component, easy to mount on another PCB board Support NMEA 0183 and SiRF binary protocol 2. Technical Specifications 2.1. Electrical Characteristics 2.1.1 General Frequency C/A code Channels 2.1.2 Sensitivity Tracking 2.1.3 Accuracy (Open Sky) Position Time 2.1.4 Datum Default L1, 1575.42 MHz 1.023 MHz chip rate 20 channels all in view tracking -159 dBm typical 10 meters, 2D RMS 5 meters 2D RMS, WAAS enabled 1 microsecond synchronized to GPS time WGS-84 2 SR-90 User’s Manual V1.1

SR-90 Manual V1.0 2.1.5 Acquisition Rate (Open Sky) Hot start Warm start Cold start Reacquisition 1 sec, average 38 sec, average 42 sec, average 0.1 sec, average 2.1.6 Dynamic Conditions Altitude Velocity Acceleration Jerk 2.1.7 Power Main power input Supply Current 2.1.8 Serial Port Electrical interface Protocol support Default NMEA 2.1.9 Time 18,000 meters (60,000 feet) max 515 meters/sec (1000 knots) max Less than 4 G 20 meters/sec max 3.3 ± 5% VDC input 68mA (Continuous mode) TTL level NMEA-0183, SiRF Binary GGA, GSA, GSV, RMC, (GLL, VTG, and ZDA optional) 4800 baud rate (other rate optional) 8 bits data, 1 stop bit, no parity. 1 PPS Pulse, pulse duration 1µs. Time reference at the pulse positive edge. Synchronized to GPS time, ±1µs. 2.2. Environmental Characteristics Operating temperature range Storage temperature range -40 oC to +85 oC -45 oC to +100 oC 3 SR-90 User’s Manual V1.1

2.3. Physical Characteristics Top view SR-90 Manual V1.0 Pin Assignment Pin 1 2 3 4 5 6 7 8 9 10 11 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Signal Name VCC GND Boot select RXA TXA TXB RXB I/O I G I Description DC Supply Voltage input Ground Boot mode I O O I Serial port A Serial port A Serial port B Serial port B GPIO14 I/O General –purpose I/O RF_ON GND GND_A RF_IN GND_A V_ANT_IN VCC_RF V_BAT Reset GPIO10 GPIO1 GPIO5 GPIO0 GPIO13 G G I G I O I I I/O I/O I/O I/O I/O Digital Ground Analog Ground GPS Signal input Analog Ground Active Antenna Bias voltage Supply Antenna Bias voltage Backup voltage supply Reset (Active low) General purpose I/O General purpose I/O General purpose I/O General purpose I/O (support continuous power mode only) General purpose I/O GPIO15 PPS GND I/O O G General purpose I/O One pulse per second Digital Ground 4 SR-90 User’s Manual V1.1

SR-90 Manual V1.0 Definition of Pin assignment VCC This is the main DC supply for a 3.3V ± 5% DC input power module board. GND GND provides the ground for digital part. Boot select Set this pin to high for programming flash. RXA This is the main receiver channel and is used to receive software commands to the board from SIRFdemo software or from user written software.PS: Pull up if not used. RXB This is the auxiliary receiving channel and is used to input differential corrections to the board to enable DGPS navigation.PS: Pull up if not used. TXA 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). RF_ON This pin indicates state of RF voltage. RF_IN This pin receiver signal of GPS analog .due to the RF characteristics of the signal the design has to certain criteria. The line on the PCB from theantenna (or antenna connector) has to be a controlled microstrip line at 50Ω V_ANT_IN This pin is reserved an external DC power supply for active antenna. If using 3.0V active antenna, pin 19 has to be connected to pin 20. If using 3.3V or 12V active antenna, this pin has to be connected to 3.3V or 5Vpower supply. VCC_RF This pin provides DC voltage 3.0 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. Backup battery (V_BAT) 5 SR-90 User’s Manual V1.1

This is the battery backup input that powers the SRAM and RTC when main power is removed. Typical current draw is 15uA. Without an external backup battery, the module/engine board will execute a cold star after every turn on. To achieve the faster start-up offered by a hot or warm start, a battery backup must be connected. The battery voltage should be between 2.0v and 5.0v. Without an external backup battery or super cap, the TMP will execute a cold start after every power on. To achieve SR-90 Manual V1.0 the faster start-up offered by a hot or warm start, either a battery backup must be connected or a super cap installed. To maximize battery lifetime, the battery voltage should not exceed the supply voltage and should be between 2.5V and 3.6V. With the super cap (B1) installed, and after at least ten minutes of continuous operation, the data retention is about seven hours. Note that even though all other components are rated at –30 to +85 deg C, a typical super cap is specified over a temperature range of –25 to +70 deg C and a typical rechargeable Lithium battery is over –20 to +70 deg C. GPIO Functions Several I/Os are connected to the digital interface connector or custom applications. Application Circuit 6 SR-90 User’s Manual V1.1

SR-90 Manual V1.0 (1) Ground Planes: SR-90 GPS receiver needs two different ground planes. The GND_A pin(11、12、13、14、15、16、18) shall be connect to analog ground. The GND pin(2 、10、30) connect to digital ground. (2) Serial Interface: The Serial interface pin(RXA 、TX1、TXB 、RXB) is recommended to pull up(10KΩ). It can increase the stability of serial data. (3) Backup Battery: It’s recommended to connect a backup battery to V_BAT. In order to enable the warm and hot start features of the GPS receiver. If you don’t intend to use a backup battery, connect this pin to GND or open. If you use backup battery, shall need to add a bypassing capacitor (10uF) at V_bat trace. It can reduce noise and increase the stability. (4) Antenna: Connecting to the antenna has to be routed on the PCB. The transmission line must to controlled impedance to connect RF_IN to the antenna or antenna connector of your choice. (5) Active antenna bias voltage: The Vcc_RF pin (pin 20) is providing voltage 3.3V. If you use active antenna, you can connect this pin to V_ANT_IN pin (pin 19) to provide bias voltage of active. Mechanical Layout 7 SR-90 User’s Manual V1.1

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达伽马 GPS导航设备-SR-90说明书.pdf

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