Clocking Scheme; Bluetooth; Fm Radio - Nokia MOBILE TERMINAL Service Manual

Clocking scheme

In BB5, two main clocks are provided to the system: 38.4MHz RF clock produced by VCTCXO in RF section and
32.768kHz sleep clock produced by AVILMA with an external crystal.
32 k Sleep Clock is always powered on after startup. Sleep clock is used by RAPIDO for low-power operation.
SMPS Clk is 2.4 MHz clock line from RAPIDO to BETTY. In deep sleep mode, when VCTCXO is off, this signal is
set to '0'-state.
BT Clk is 38.4 MHz signal from AHNEUS ASIC to BT module.
CLK600. The clock source is internal RC oscillator in BETTY (during the power-up sequence) or RAPIDO SMPS
Clk.

Bluetooth

Bluetooth module BTHFMRDS2.1M provides a fully digital link for communication between a master unit (the
phone) and one or more slave units (e.g. a wireless headset). Bluetooth can also be used as a wireless link
between a personal computer and the phone.
Bluetooth connects directly to the Rapido with UART (universal asynchronous reveiver / transmitter). Control
signals are connected to Rapido's genios (BT_Wakeup, UART_Wakeup, Reset.) Bluetooth digital audio is
connected to Rapido via PCM interface.
Clock source for Bluetooth module is a separated 38.4MHz oscillator, which is also used for WLAN module.
BT/WLAN clock request signals are combined together for a common clock request signal, which is then used
as wake-up control of the oscillator IC. 38.4MHz clock is used as a sysclk for BT module.
BTHFMRDS2.1M is using VIO 1.8V as its only power source..
The Bluetooth is physically integrated with the FM radio into the same module.

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.
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Figure 54 RM-356 clocking scheme, TBD
Figure 55 FM interface
COMPANY CONFIDENTIAL
Copyright © 2008 Nokia. All rights reserved.
System Module and User Interface
RM-356
Issue 1