User Guide

Ambient light sensor (ALS)

The ambient light sensor (ALS) consists of

• a lightguide

• a light sensor + a decoupling capacitor (last one not important for ALS operation)

• EM ASIC N2200

The ambient light sensor is used to control the lights of the phone:

• Keyboard lightning is switched on only when environment is dark/dim

• Display backlights are dimmed when environment is dark/dim.

The ambient light sensor itself is a photo transistor.

Audio concept

The functional core of the audio hardware is built around EM ASIC N2200 and RAP.

N2200 provides an interface for the trancducers. Integrated hands free (IHF) stereo speakers are driven by

D-class audio amplifiers.

There are three audio transducers:

• 1digital microphone

• 1 earpiece

• 1 IHF (internal handsfree) speaker

N2200 also provides an output for the vibra motor.

Most headsets, or other external audio accessories, can only be connected via bluetooth.

RM-265

System Module

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