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Table of Contents

Introduction............................................................................................................................................................5–5

Phone description .............................................................................................................................................5–5

Energy management..............................................................................................................................................5–8

Battery and charging ........................................................................................................................................5–8

Normal and extreme voltages .........................................................................................................................5–9

Power key and system power-up....................................................................................................................5–9

Modes of operation...........................................................................................................................................5–9

USB, SIM, µSD........................................................................................................................................................ 5–10

Micro USB interface ........................................................................................................................................ 5–10

SIM interface ................................................................................................................................................... 5–10

µSD card interface .......................................................................................................................................... 5–11

User interface....................................................................................................................................................... 5–12

Display module............................................................................................................................................... 5–12

Keyboard ......................................................................................................................................................... 5–12

Backlight and illumination............................................................................................................................ 5–13

Audio concept...................................................................................................................................................... 5–14

AV connector........................................................................................................................................................ 5–15

RF description ...................................................................................................................................................... 5–16

Receiver (RX)................................................................................................................................................... 5–16

Transmitter (TX) ............................................................................................................................................. 5–17

Bluetooth ........................................................................................................................................................ 5–18

Technical specifications...................................................................................................................................... 5–18

Main RF characteristics for GSM band phone............................................................................................... 5–18

Environmental conditions ............................................................................................................................. 5–19

List of Tables

Table 7 Nominal voltages......................................................................................................................................5–9

Table 8 Key signal matrix ................................................................................................................................... 5–12

Table 9 AV connector pins .................................................................................................................................. 5–16

List of Figures

Figure 23 Battery pin order...................................................................................................................................5–8

Figure 24 SIM interface ....................................................................................................................................... 5–11

Figure 25 Audio block diagram.......................................................................................................................... 5–15

Figure 26 Bluetooth interface............................................................................................................................ 5–18

RM-352; RM-354

System Module

Issue 1 COMPANY CONFIDENTIAL Page 5 –3