Fastrax IT321, Техническое описание

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2007-11-19
Page 7 of 35
IT321_Tech_doc_12
1. GENERAL DESCRIPTION
The Fastrax IT321 is an OEM GPS receiver module, which provides
the SiRFstarIII receiver
(ref I) functionality using the state of the art
SiRF GSC3LT chip. The module has tiny form factor 10.4x14.0mm,
height is 2.3mm nominal (2.6mm max). The Fastrax IT321 receiver
provides low power and very fast TTFF together with weak signal ac-
quisition and tracking capability to meet even the most stringent per-
formance expectations.
The module is available with two versions:
•
SiRF ROM code version
•
Early samples can be provided with embedded flash version
(4Mbit in GSC3LTf) for evaluation with GSWLT3 firmware.
The module provides complete signal processing from antenna input
to serial data output in either NMEA messages
(ref II) or in SiRF bi-
nary protocol (ref III) . The module requires a main power supply VDD,
which can be powered directly from a raw battery voltage. The Fas-
trax IT321 module interfaces to the customer’s application via one se-
rial port. Serial data and I/O signal levels are 1.8V or 1.2V CMOS
compatible.
The antenna input supports passive and active antennas and provides
also an internally generated antenna bias supply.
This document describes the electrical connectivity and main func-
tionality of the Fastrax IT321 OEM GPS Receiver module.