原标题：Fastrax IT430 OEM GPS接收解决方案

　　Fastrax公司的 IT430是 OEM GPS接收器模块，采用最新的SiRF GSD4e芯片提供SiRFstar IV接收器功能，外型尺寸只有9.6x9.6x1.85mm，提供了低功耗和弱信号时非常快的TTFF和跟踪性能，以满足最严格应用要求。跟踪灵敏度达 -163dBm，48通路，工作电压1.71-1.89V,天线增益范围0-25dB。本文介绍了IT430主要特性和指标，方框图，参考电路图以及 AP430 应用电路板电路图和材料清单，PCB布局图。

　　Fastrax IT430 OEM GPS Receiver

　　The Fastrax IT430 is an OEM GPS receiver module, which provides the SiRFstar IV receiver (refI) functionality using the state of the art SiRF GSD4e chip (ROM variant). The module has ultra small form factor 9.6x9.6 mm, height is 1.85 mm nominal (2.15 mm max). The Fastrax IT430 receiver provides low power and very fast TTFF together with weak signal acquisition and tracking capability to meet even the most stringent performance expectations.

　　The module provides complete signal processing from antenna input to host port in either NMEA messages (ref II) or in SiRF OSP binary protocol (ref III). The module requires a single power supply VDD +1.8V. The host port is configurable to UART, SPI or I2C during power up. Host data and I/O signal levels are 1.8V CMOS compatible, inputs are 3.6V tolerable.

　　The SiRFstar IV provides a new feature called SiRFAware (also referenced as Micro Power Management mode), which enables fast TTFF for Snap start mode while consuming only 500 uA average current (typ.) in autonomous Hibernate state. The receiver does wakeup autonomously to calibrate internal GPS time and to collect ephemeris data while maintaining 1 sec Snap fix capability. The module supports also connectivity to optional external sensors for Dead Reckoning like 3D-accelerometer on dedicated DR_I2C bus.

　　The receiver is also optionally self-assisted since the Client Generated Extended Ephemeris (CGEE) calculation is embedded in the software without any resources required from the host. The CGEE data is stored on external serial EEPROM memory on the dedicated DR_I2C bus (can be optionally transferred to/from host).

　　The SiRFstar IV contains also a CW Jammer Remover, which will track and remove up to 8 CW (Carrier Wave) type signals up to 80dBHz (equals to -90 dBm typ.) signal level.

　　The antenna input supports passive and active antennas and provides also an input for externally generated antenna bias supply.

　　图1。IT430方框图

　　IT430通用指标：

　　AP430 应用电路板

　　The Fastrax Application Board AP430 provides the IT430 connectivity to the Fastrax valuation Kit or to other evaluation purposes. It provides a single PCB board equipped with the IT430 module, 1.8V regulator, 1 Mbit EEPROM, MEMS accelerometer, 4 channel level translator for 1.8V I/O to 3.3V conversion, MCX antenna connector, Antenna Bias +3.3 V switch, Push-Button for ON_OFF control and 2x20 pin Card Terminal connector.

　　AP430 应用电路板材料清单(BOM)：