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.
Figure 38 Clocking scheme
Bluetooth
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
module.
The Bluetooth is physically integrated with the FM radio into a discrete module. From a functional point of
view they, however, have nothing in common.
RM-243
System Module and User Interface
Issue 1 COMPANY CONFIDENTIAL Page 6 –11
Copyright © 2007 Nokia. All rights reserved.
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