External microphone
Galvanic accessories are connected to the AV connector.
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.
RM-356
System Module and User Interface
Issue 1 COMPANY CONFIDENTIAL Page 6 –31
Copyright © 2008 Nokia. All rights reserved.
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