User Guide

NEM-2

System Module and User Interface CCS Technical Documentation

Introduction

Electrical Modules

The NEM-2 phone comprises two modules: the main PWB (EM21) and UI PWB (EM20)

The system module EM11 consists of Radio Frequency (RF) and baseband (BB). User Inter-

face (UI) contains only LCD connector, backlight LEDs, keypad layout and Earpiece cir-

cuit.

FM radio is located on the main PWB EM21.

The modules are connected with each other by B2B connectors.

In general NEM-2 baseband hardware consists of two parts:

• GSM Phone

• Audio Player

Phone part is based on DCT4 common baseband architecture. Qwerty-keyboard is con-

nected to UPP ASIC.

Audio Player part contains functionality needed for stereo audio features. MMC interface

and USB interface are included as well.

Phone controls power up and reset of Audio Player part via dedicated hardware signals.

In operational modes both parts are running asynchronous, communication takes place

via UART based asynchronous serial interface.

Special audio routing provides for the connection between audio sources and audio out-

puts. Audio lines are part of the Phone- Audio Player interface as well.

The purpose of the RF block is to receive and demodulate the radio frequency signal from

the base station and to transmit a modulated RF signal to the base station.