环天 GPS导航设备-ET-314说明书.pdf

发布时间：2022-05-13 发布人：admin 分类：说明书资料大小：0.26M 资料格式：pdf 举报版权申诉

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環天衛星科技股份有限公司 PRODUCT USER MANUAL GPS ENGINE BOARD ET-314 GlobalSat Technology Corporation 台北縣中和市建一路 186 號 16 樓(遠東世紀廣場) 16, No.186,Chien 1 Road, 235Chung Ho City,Taipei Hsien, Taiwan ,R.O.C. Tel: 886-2-8226-3799(Rep.) Fax: 886-2-8226-3899 Web: www.globalsat.com.tw E-mail: service@globalsat.com.tw

SiRF StarⅢ L1, 1575.42 MHz 1.023 MHz chip rate 20 channel all-in-view tracking -159 dBm 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 Specification: General Chipset Frequency C/A code Channels Sensitivity Accuracy Position Velocity Time Datum Default Acquisition Time Reacquisition Hot start Warm start Cold start Dynamic Conditions Altitude Velocity Acceleration Jerk 18,000 meters (60,000 feet) max 515 meters /second (1000 knots) max Less than 4g 20m/sec **3 10 meters, 2D RMS 5 meters, 2D RMS, WAAS enabled 0.1 m/s 1us synchronized to GPS time 0.1 sec., average 1 sec., average 38 sec., average 42 sec., average WGS-84

Power Main power input Power consumption Interface Dimension Baud rate Output message 3.3V +- 5% DC input 68mA (Continuous mode) 25.4mm * 25.4 mm * 3.3mm 4,800 to 57,600 bps adjustable SiRF binary or NMEA 0183 GGA, GSA, GSV, RMC, VTG, GLL GPS Antenna Specification(Recommendation) Frequency: 1575.42+2 MHz Axial Ratio: 3 dB Typical output Impedance: 50Ω Polarization: RHCP Amplifier Gain :20~26dB Typical Output VSWR: 2.0 Max. Noise Figure: 2.0 dB Max. Environmental Operating Temp -40℃ to +85℃

Pin Assignment Pin 1 2 3 4 5 6 7 8 9 10 11 16 17 18 19 20 21 22 Signal Name VCC GND Boot select RXA TXA TXB RXB GPIO14 RF_ON GND GND_A RF_IN GND_A V_ANT_IN VCC_RF V_BAT Reset I/O I G I I O O I I/O G G I G I O I I Description DC Supply Voltage input Ground Boot mode Serial port A Serial port A Serial port B Serial port B General –purpose 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)

23 24 25 26 27 28 29 30 GPIO10 GPIO1 GPIO5 GPIO0 GPIO13 GPIO15 PPS GND I/O I/O I/O I/O I/O I/O O G 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 General purpose I/O One pulse per second Digital Ground 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 the antenna(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 5V power 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) 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 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 for custom applications. Application Circuit VCC 2 2 2 2 R1 10k R2 10k R3 10k R4 10k 1 1 1 1 GPIO_14 U1 GPS VCC GND Bootselect RXA TXA TXB RXB GPIO_14 RF_ON GND A_GND A_GND A_GND A_GND A_GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 GND 1PPS GPIO_15 GPIO_13 GPIO_0 GPIO_5 GPIO_1 GPIO_10 NRESET V_BAT VCC_RF V_ANT A_GND RF_IN A_GND 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 1PPS GPIO_15 GPIO_13 GPIO_0 GPIO_5 GPIO_1 GPIO_10 RESET V_BAT VCC_RF V_ANT 50 ohm microstrip line 2 ACTIVE ANT 1 RXA TXA TXB RXB

(1) Ground Planes: ET-314 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

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环天 GPS导航设备-ET-314说明书.pdf

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