User Guide

CCS Technical Documentation System Module
RH-25
Issue 1 10/2003 ©Nokia Corporation Confidential Page 19
IrDa Interface
The IrDa interface when using transceiver with 1.8V I/O is designed into the UPP. The IR
link supports speeds from 9600 bit/s to 1.152 MBit/s up to distance of 80 cm. Transmis-
sion over the IR if half-duplex.
The length of the transmitted IR pulse depends on the speed of the transmission. When
230.4 kbit/s or less is used as a transmission speed, pulse length is maximum 1.63ms. If
transmission speed is set to 1.152Mbit/s, the pulse length is 154ns.
IR transceiver can be set into SIR or MIR modes. In SIR mode transceiver is capable of
transmission speed up to 115.2kbit/s. In MIR mode faster transmission speeds are used.
The maximum speed is 1.152Mbit/s. IR transceiver can be set into shutdown mode by
setting SD pin to logic '1' for current saving reasons.
Vibra
A vibra alerting device is used to generate a vibration signal for an incoming call. Vibra is
located in the bottom end of the phone and connection is done with spring contacts.
Vibra interface is the same like other DCT4 projects. The vibra is controlled by a PWM
signal from the UEM. Frequency can be set to 64, 129, 258, or 520 Hz and duty cycle can
vary between 3% - 97%. To ensure compatibility with different version of UEM, RH-25
uses 40.5% duty cycle of the vibra PWM signal.
FM Radio
FM radio circuitry is implemented by using highly integrated radio IC, TEA5767. TEA5767
is a single-chip, electronically tuned FM stereo radio with fully integrated IF selectivity
and demodulation. The IF-frequency is 225 kHz. The radio is completely adjustment-free
and does only require a minimum of small and low-cost external components. It has sig-
nal-dependent mono/stereo blend [Stereo Noise Cancelling (SNC)]. The radio can tune
the European, US, and Japan FM bands. This will be offered as an accessory with
RH-25.
Channel tuning and other controls are controlled through serial bus interface by the
MCUSW. Reference clock, 32kHz, is generated by the UPP CTSI block (routed from sleep
clock).
Figure 14: FM radio digital interface connections
UPP8M
TEA5767
FMClk
FMCtrlDa
FMCtrlClk
FMWrEn
VIO
W/R
SCL
SDA
XTAL2
GenIO(3)
GenIO(12)
GenIO(8)
GenIO(11)