Specifications

XT55 Hardware Interface Description

Confidential / Preliminary

mo b i l e

XT55_hd_v00.02 Page 22 of 116 17.03.2004

2.2 Circuit concept

The XT55 module comprises the following major functional components:

GSM / GPRS baseband block:

· Baseband controller operating at 26MHz

· Power supply ASIC

· Stacked Flash / SRAM

· Application interface (board-to-board connector)

GSM RF block:

· Skyworks RF transceiver

· Skyworks RF power amplifier / FEM

· RF front end (antenna connector)

GPS block:

· Processor type: ARM7/TDMI

· Processor speed: 25 MHz

GPS RF block:

· GPS receiver with SiRFstar Ile/LP chip set