User Guide

RH-25
System Module CCS Technical Documentation
Page 10 ©Nokia Corporation Confidential Issue 1 10/2003
Figure 3: Interconnection diagram
Supply Voltage Regulation
The UEM ASIC controls supply voltage regulation. There are six separate regulators used
by baseband block. For more detailed description about the regulator parameters see the
document UEM ASIC Specification.
Charging
RH-25 baseband supports the NMP charger interface specified in the document Janette
Charger interface, SW control is specified in EM SW Specification, ISA EM Core SW
Project. The UEM ASIC controls charging, and external components are used to provide
EMC, reverse polarity, and transient protection of the charger input to the baseband
module. The charger connection is through the system connector interface. Both 2- and
3-wire type chargers are supported. The operation of the charging circuit has been spec-
ified to limit the power dissipation across the charge switch and to ensure safe operation
in all modes.
Overcharge /
Overdischarge
protection
VBATT
BSI
BTEMP
EMC
Li-Ion