Reference Guideline toTFAC GPS Engine Board TFAG 10 About This Document This document contains the guideline for TFAC GPS Engine Board – TFAG 10. TFAC has another powerful and miniatured GPS receiver -TFAG 30, which is described in “Reference Guideline to TFAC GPS Engine Board Series- TFAG 30 (Miniature!)” manual. Products Supported This document describes the guideline to using those of TFAC GPS Engine Board - TFAG 10. Chapter 1 Introduction to TFAC GPS TFAG 10 GPS Receiver Features ‧ ‧ ‧ ‧ ‧ ‧ ‧ ‧ ‧ ‧ ‧ ‧ ‧ 12 Channel “All-in-view” GPS C/A and carrier Fast Cold/Warm/Hot Start TTFF time of 45/38/8 sec Fast reacquisition time of 0.1 sec Degraded mode solution enables during short blockage situation Excellent sensitivity under weak satellite signals Single satellite tracking capability Dual multipath rejection NMEA 0183 ver2.2 GGA, GLL, GSA, GSV, RMC, and VTG sentences output SiRF binary protocol output On-board Real-time RTCM SC-104 differential 1 PPS (one pulse per second) signal Two serial ports with default TTL Modifications upon customers request TFAG 10 Based on the SiRF star I/LXTM chip set, TFAC’ s 12-channel “ALL-in-View” TFAG 10 GPS Receiver module offers not only superior performance but also high reliability at very competitive price in the market. With its small compact size and flexibility for options, TFAG 10 GPS receiver module is suitable and versatile in such commercial applications as handheld, wireless, leisure, child safety, outdoor navigation, emergency call, and location identification. -1- Quick View on Specifications Receiver type Channel, Frequency Position Accuracy Velocity Accuracy Time Accuracy Max Speed Acceleration Jerk Max Altitude Time to First Fix TFAG 10 12 Channel L1 C/A 25 meters CEP without SA 0.1 meters/second, without SA 1 us synchronized to GPS time 515 meters/sec max 4 g., max. 3 20 meters /sec. max. 18,000 meters max. 48/38/8/0.1 sec (Cold/Warm/Hot Start) 0.1 sec (Reacquisition) 1/sec -175dBW WGS-84 +5V DC 180 mA 4800 baud (default) NMEA 0183 v2.2 SiRF Binary RTCM SC-104 v2.0 type 1,2,9 72 x 42 x 12 mm 23g -40°C to +85°C -55°C to +100°C Update Rate Receiver Sensitivity Map Datum Input Voltage Current (Avg.) Serial Comm. Protocol Messages Dimensions Weight Operating Temp Storage Temp -2- Chapter 2 Specifications TFAG 10 1. Electrical Characteristics 1.1 General Frequency C/A code Channels Position Velocity Time Position Velocity WGS-84 Reacquisition Cold start Warm start Hot start Altitude Velocity Acceleration Jerk Main Power Supply Current Backup Power Backup Current Active low input Electrical interface Protocol NMEA output DGPS protocol 1.10 Time-1PPS Pulse Level Pulse duration Time reference Measurements Two full duplex serial communication Design-in binary and NMEA-0183, Version 2.2 0 with a baud rate selection GGA,GLL,GSA,GSV,RMC and VTG(on customer request) Default all 6 NMEA (Baud Rate :4800) RTCM SC-104, version 2.00, type1,2 and 9 TTL 100 ms At the pulse positive edge Aligned to GPS second, ± 1µ sec. 0.1 sec., average 48 sec., average 38 sec., average 8 sec., average 18,000 meters (60,000 Feet) max. 515 meters/sec.(1000 Knots) max. 4 g., max. 3 20 meters/sec. max. +5Vdc±5% 180 mA typical +2.5V to 4.5V 10µA typical L1,1575.42MHz 1.023 MHz chip rate 12 25 meters CEP without SA 0.1 meters/second, without SA 1 microsecond synchronized to GPS time 1 to 5 meters, typical 0.05 meters/second, typical 1.2 Accuracy 1.3 DGPS Accuracy 1.4 Datum 1.5 Acquisition Rate 1.6 Dynamic Condition 1.7 Power 1.8 External Reset 1.9 Serial Port 2. Environmental Characteristics -3- 2.1Temperature Operating range Storage range - 40 ℃ to + 85 ℃ - 55 ℃ to +100 ℃ 2.2 Physical characteristics Length Width Height Weight Antenna connector Interface connector 3. Antenna 72 mm 42 mm 12 mm 23 gm MCX type 20-pin straight header, 2 mm Passive or Active Antenna -4- Chapter 3 Interface Description and Options This chapter describes the pin definitions of the interface connector and flexible options of TFAC GPS engine board - TFAG 10. Connector Layout with Top View RF DIGITAL For TFAG 10 #1 #3 #5 #7 #9 #11 #13 #15 #17 #19 #2 #4 #6 #8 #10 #12 #14 #16 #18 #20 Pin Definition of the Digital Interface Connector TFAG 10 Table D-1 Pin List of the 20- pin Digital Interface Connector of TFAG 10 Pin Number 1 2 3 4 5 6 7 8 9 10 Name VANT VCC BAT VDD PBRES RESERVED RESERVED RESERVED RESERVED GND Description Antenna DC Voltage +5V DC Power Input Backup Battery +3.3V DC Power Input Push Button Reset Input, Active Low Reserved Reserved Reserved Reserved Ground -5- 11 12 13 14 15 16 17 18 19 20 TXA RXA GND TXB RXB GND RESERVED GND TIMEMARK RESERVED Serial Data Output A Serial Data Input A Ground Serial Data Output B Serial Data Input B Ground Reserved Ground 1PPS Time Mark Output Reserved VCC_5V (+5V DC Power Input) This is the main DC power supply for a +5V powered TMP board. VCC_3V (+3.3V DC Power Input) This is the main DC supply for a +3.3V powered TMP board (currently not used). ANT_PWR DC voltage for an active antenna is not required for operation with a passive antenna. The antenna power (+5V) may be supplied through the interface connector GND GND provides the ground for the TMP board. Connect all grounds. Serial Data: RXA, RXB, TXA, and TXB The TMP supports two full duplex serial channels. All four connections are at TTL Levels, all support variable baud rates, and all can be controlled from the appropriate screens in SiRFdemo ToolKit A TTL to RS232 conversion is necessary to directly communicate with a PC serial port. RXA This is the main receiver channel and is used to receive software commands to the TMP board from SiRFdemo software or from user written software. RXB This is the auxiliary receive channel and is used to input differential corrections to the TMP board to enable DGPS navigation. -6- TXA This is the main transmit channel and is used to output navigation and measurement data to SiRFdemo or user written software. TXB For user’s application ds(not currently used). PBRES This pin provides an active-low reset input to the TMP board. It causes the TMP board to reset and start searching for satellites. If not utilized, it may be tied high. Timemark This pin provides one pulse-per-second output from the TMP board, which is synchronized to GPS time. The output is a TTL negative level signal with negative logic. Backup Battery (VBAT) This is the battery backup input that powers the SRAM and RTC when main power is removed. Typical current draw is 10uA. Without an external backup battery or supercap, theGPS receiver 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 supercap installed. To maximize battery lifetime, the battery voltage should not exceed the supply voltage. With the supercap 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 –40 to +85 deg C, a typical supercap 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. Option Descriptions Input Power Options TFAG 10 There are two options for different DC input voltages, including 5V or Battery mode operation. -7- Table D-5 Input Power Load Options Mode Input Voltage Range [V] 5V 5V +- 5% Battery 3.4 to 5.25 V(note) Note: In Battery Mode, the input voltage is unregulated in the range of 3.4V to 5.25V. Backup Power Options TFAG 10 Backup power is required for data retention of the SRAM memory and maintaining the real-time-clock. Two backup power options are available. The supercap is easy on maintenance, and provides backup for a limited number of hours while the battery provides backup for the duration of the battery lifetime. The load on the battery is from both the static SRAM (less than 1uA typical) and the RTC circuit (4uA typical). The battery lifetime will be as follows: T = 190,000 / 5 = 38,000 hours = 4.3 years The supercap discharge time is proportional to the capacitance of the supercap using the following equation: H [hours] = 31.8 * C [F]. For instance, the specified 0.22F supercap should provide backup voltage for up to 7 hours. Backup Power Source Load Options: “External Battery” or “Supercap”. Antenna and Interface Connector Option TFAG 10 Connector forms of I/O pins (20- pin interface connector) and on-board antenna base (MCX or SMA type) for TFAG 10 can be selected as Top, Bottom, or Right angle side configuration to meet customers’ requirement. -8-