NSB-9
System Module and User Interface
CCS Technical Documentation
Page 28
Nokia Corporation
Issue 1 04/03
FM Radio
FM radio circuitry used in NSB-9 is a single-chip electronically tuned FM stereo radio
with fully integrated IF selectivity and demodulation. The radio is completely adjust-
ment-free and does only require a minimum of small and low cost external components.
It has signal dependent mono/stereo blend [Stereo Noise Cancelling (SNC)]. The radio can
tune the European, US and Japan FM bands.
FM-radio digital interface 3-wire bus contains write/read, clock and data lines. The bus
operates at maximum clock frequency of 1MHz. Channel tuning and other controls are
controlled through serial bus interface by the MCUSW. Reference clock, 32kHz, is gener-
ated by the UPP CTSI block (32kHz from sleep clock)
Figure 3: FM radio digital interface.
UPP
TEA5767
FMClk
FMCtrlDa
FMCtrlClk
FMWrEn
VIO
W/R
SCL
SDA
XTAL2
GenIO(3)
GenIO(12)
GenIO(8)
GenIO(11)