User's Manual Part 1

MC75 Hardware Interface Description

Strictly confidential / Draft

MC75_V00.190a Page 18 of 91 15.02.2005

Feature Implementation

ASC1

• 4-wire, unbalanced asynchronous interface

• 1.2 kbps to 460 kbps

• Autobauding TBD

• Supports RTS1/CTS1 hardware handshake and software

XON/XOFF flow control

USB Supports a USB 2.0 Full Speed (12 Mbit/s) slave interface.

C I

C bus for transmission rates up to 400 kbps

SD card interface Interface for SD memory card or multimedia card

Audio

• 2 analog interfaces

• 1 digital interface (PCM)

SIM interface Supported SIM cards: 3V, 1.8V

Antenna 50 Ohms. External antenna can be connected via antenna

connector or solderable pad.

Module interface 80-pin board-to-board connector

Power on/off, Reset

Power on/off

• Switch-on by hardware pin IGT

• Switch-off by AT command (AT^SMSO)

• Automatic switch-off in case of critical temperature and

voltage conditions.

Reset

• Orderly shutdown and reset by AT command

• Emergency reset by hardware pin EMERG_RST

Special features

Charging Supports management of rechargeable Lithium Ion and Lithium

Polymer batteries

Real time clock Timer functions via AT commands

Phonebook SIM and phone

Evaluation kit

DSB75 DSB75 Evaluation Board designed to test and type approve

Siemens cellular engines and provide a sample configuration for

application engineering.