Bluetooth; Fm Radio - Nokia n80 User Manual

RM-91; RM-92
Nokia Customer Care System Module
Figure 89 Clocking scheme

Bluetooth

The Bluetooth and WLAN solutions share a common antenna. The BT antenna path passes through the WLAN
module, and whilst BT and WLAN are both active, the use of the antenna is negotiated via the BT-WLAN
interacitivity lines WLANBT_CSX(3:0).
When WLAN ins inactive, the BT acquires the antenna by the action of the BT_CLOCK_REQUEST line, which
enables the WLAN power regulators N5501, N5502 and N5503 via OR gate D5500. These regulators power
up part of the WLAN module, thus enabling only its internal RF switch for BT use, whilst the remainder of the
WLAn functionality remains sleeping.
Bluetooth provides a fully digital link for communication between a master unit and one or more slave units.
The system provides a radio link that offers a high degree of flexibility to support various applications and
product scenarios. Data and control interface for a low power RF module is provided. Data rate is regulated
between the master and the slave.

FM radio

The FM radio is an integrated circuit, controlled by MCU software through a serial bus interface. The wires of
the headset are used as poles of the antenna, and no other antenna is needed for FM radio reception.
The antenna for the FM radio is provided by plugging in an external wired headset to the system connector.
It is not possible to listen to the FM radio without a wired headset connected. The FM radio is controlled by
I2C commands from RAP. The audio output of the FM radio is fed to the headset via EM ASIC N2200, so the
rest of the phone can sleep while the FM radio is active.
Page 9 –12 COMPANY CONFIDENTIAL Issue 1
Copyright © 2006 Nokia. All rights reserved.