User Guide

Table Of Contents

µSD card interface

The µSD card is connected to the engine by an external level shifter and ESD protection filter. Supplied

voltages:

• VMMC: 2.85 V (from level shifter)

• VIO: 1.8 V (from Retu)

The card removal is detected by a push detect switch.

User interface

Display

The display unit comprises a parallel interface.

Keyboard

All keys are placed on the main PWB.

• Numeric keys

• Navigation key, Soft keys, Start, and End

• Power switch

• Volume up and down switch

Display and keypad backlight

There are two sets of LEDs illuminating the display and the keypads:

• Display LEDs, 4pcs

• Main keypad on PWB, 4 pcs, white colour

All sets share the same driver. None of the keypads can be illuminated without the LCD backlight being turned

on.

Audio concept

The functional core of the audio hardware is built around two ASICs; RAP engine and Retu.

Retu provides an interface for the trancducers and the AV connector.

There are three audio transducers:

• 1 dynamic earpiece

RM-272; RM-273

System module

Issue 1 COMPANY CONFIDENTIAL Page 5 –13