Figure 27 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.
RM-721; RM-722
System Module
Issue 1 COMPANY CONFIDENTIAL Page 5 – 13
Copyright © 2011 Nokia. All rights reserved.
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