User Guide

Accessory audio mode is automatically enabled/disabled during connection/disconnection of dedicated

phone accessories.

External microphone circuitry is biased by Avilma ASIC MicB2 bias voltage output. The circuitry provides an

asymmetrical connection for the microphone from the AV connector, XMICP to Avilma ASIC input, mic2p and

XMICN, to GND.

Figure 91 External earpiece and microphone circuitry (AV connected on the right)

Internal earpiece

Internal earpiece is used for the HandPortable (HP) call mode. A dynamic 7x11 mm earpiece capsule is

connected to Avilma ASIC’s differential output EarP and EarN.

Figure 92 Internal earpiece circuitry

Internal speakers

Internal speakers are used for Internal HandsFree (IHF) call mode, video call, ringing tones, FM radio and

music listening.

RM-176

System Module and User Interface Nokia Customer Care

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