Figure 39 Bluetooth interface
The Bluetooth has a separate built in antenna and is powered by VBAT and the regulated voltage VIO. For
audio applications the Bluetooth has a PCM data bus. In addition a UART (universal asynchronous receiver/
transmitter) is used for data communication and controls.
FM radio
The FM radio is physically integrated with the Bluetooth into one single module. From a functional point of
view they, however, have nothing in common.
Figure 40 FM interface
The FM radio is an integrated circuit, controlled by MCU software through a serial bus interface. The wires of
the headset are used as elements of the antenna, and no other antenna is needed for FM radio reception.
The radio has an automatic band search function, which can search for a strong station.
RM-243
System Module and User Interface
Page 6 –12 COMPANY CONFIDENTIAL Issue 1
Copyright © 2007 Nokia. All rights reserved.
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