User Guide

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)
Troubleshooting - Baseband Nokia Customer Care
Page 22 ©2004 Nokia Corporation Company Confidential Issue 1 - Revision 002 09/2004
Temperature and capacity information are needed for charge control. These resistors are
connected to the BSI pins on the UEM. The phone has 100KΏ pull-up resistors for these
lines so that they can be read by A/D inputs in the phone.
Figure 13: BL-6C battery pack pin order
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 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.
Figure 14: Charging circuitry
Charger Detection
Connecting a charger creates voltage on the VCHAR input of the UEM. Charging starts
when the UEM detects that the VCHAR input voltage level is above 2 V
(VCHdet+ threshold). The VCHARDET signal is generated to indicate the presence of the
charger for the SW. The charger identification/acceptance is controlled by EM SW.