AV connector
The AV connector handles audio signals output and input. It has audio left and right signals separately (pins
4 and 5) and microphone signals wired to pin 3.
Figure 40 AV connector
The plug detection signal handles the AV connector plug detection with HeadDet signal from EM ASIC.
Bluetooth interface
Bluetooth provides a fully digital link for communication between a master unit (the phone) and one or more
slave units (e.g. a wireless headset). Data and control interface for a low power RF module is provided by the
BTHFM module.
Bluetooth is physically integrated with FM radio in the BTHFM module ASIC, but from a functional point of
view they have nothing in common
Figure 41 Bluetooth interface
RM-632; RM-634; RM-699
System Module
Issue 3 COMPANY CONFIDENTIAL Page 5 – 17
Copyright © 2010 Nokia. All rights reserved.
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