User Guide

RM-11
Troubleshooting - Baseband CC Technical Documentation
Page 20 ©2004 Nokia Corporation Confidential Issue 1 02/2004
Temperature and capacity information are needed for charge control. These resistors are
connected to BSI and BTEMP pins of the battery connector. The phone has 100 kW
pull-up resistors for these lines so that they can be read by A/D inputs in the phone.
Figure 13: BLD-3 battery pack pin order
Figure 14: Interconnection diagram inside the battery pack
Charging Circuitry
The UEM ASIC controls charging depending on the charger being used and the battery
size. External components are needed for EMC, reverse polarity and transient protection
of the input to the baseband module. The charger connection is through the system
connector interface. The RM-11 baseband is designed to support DCT3 chargers from an
electrical point of view. Both two-wire and three-wire type chargers are supported.
However, 3-wire chargers are treated as 2-wire chargers.
1 (+) 2(BSI) 3(BTEMP) 4(GND)