ST20-GP6 datasheet(5/123 Pages) STMICROELECTRONICS

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ST20-GP6

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Introduction

The ST20-GP6 is an application-speciﬁc single chip micro using the ST20 CPU with

microprocessor style peripherals added on-chip. It incorporates DSP hardware for processing the

signals from GPS (Global Positioning System) satellites.

The twelve channel GPS correlation DSP hardware is designed to handle twelve satellites, two of

which can be initialized to support the RTCA-SC159 speciﬁcation for WAAS (Wide Area

Augmentation Service) and EGNOS (European Geostationary Navigation Overlay System)

services.

The ST20-GP6 has been designed to minimize system costs and reduce the complexity of GPS

systems. It offers all hardware DSP and microprocessor functions on one chip and provides

sufﬁcient on-chip RAM and ROM. The entire analogue section, RF and clock generation are

available on a companion chip. Thus, a complete GPS system is possible using just two chips, see

Figure 1.1.

Figure 1.1 GPS system

The ST20-GP6 supports large values of frequency offset, allowing the use of a very low cost

oscillator, thus saving the cost of a Temperature Controlled Crystal Oscillator (TCXO).

The CPU and software have access to the part-processed signal to enable accelerated acquisition

time.

UART

DSP

ASIC

STB5600

Antenna

CPU

Real

time

clock

Watchdog

RAM

optional

Low

cost

crystal

ST20-GP6

Parallel I/O

Single chip

No TCXO

Driver

(optional)

timer

Radio

mask ROM

Parallel

I/O

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