User Guide

RH-23 Company confidential
System Module and User Interface CCS Technical Documentation
Page 20 Nokia Corporation. Issue 1 02/2004
Figure 7: Battery pack contacts
Charging
Supported chargers are AC-1, ACT-1, ACP-7, ACP-8, ACP-9, ACP-12, LCH-8, LCH-9 and
LCH-12.
Charging is controlled by the UEM and external components are needed for EMC, reverse
polarity and transient protection of the input to the baseband module. The charger con-
nection is through the system connector interface.
The operation of the charging circuit has been specified in such a way as to limit the
power dissipation across the charge switch and to ensure safe operation in all modes.
Table 13: Charging Connector characteristics
Stereo FM Radio
RH-23 is using the same FM radio module as HDb12 and HDb18. 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 demodula-
tion. 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 signal dependent
mono/stereo blend [Stereo Noise Cancelling (SNC)]. The radio can tune the European, US
and Japan FM bands. 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).
Pin Signal Min Nom Max Condition Note
1 VCHAR 11.1 Vpe a k 16.9 Vpeak
7.9 Vrms
1.0 Apeak
Standard charger Charger positive input
7.0 Vrms 8.4 Vrms 9.2 Vrms
850 mA
Fast charger
2 GND 0 Charger ground