Charging Operation; Battery - Nokia RM-11 Series Troubleshooting Manual

RM-11
Troubleshooting - Baseband

Charging Operation

Battery

A Lithium-Ion cell battery with a capacity of 780 mAh is used. Reading a resistor inside
the battery pack on the BSI line indicates the battery size. NTC-resistor inside the battery
measures the battery temperature on the BTEMP line.
Temperature and capacity information are needed for charge control. These resistors are
connected to BSI and BTEMP pins of battery connector. The mobile terminal has 100 kW
pull-up resistors for these lines so that they can be read by A/D inputs in the mobile
terminal.
©2005 Nokia Corporation
Page 24
4(GND) 3(BTEMP)
Figure 9: BLD-3 battery pack pin order
VBATT
BSI
BTEMP
EMC
Figure 10: Interconnection diagram inside the battery pack
CC Technical Documentation
2(BSI) 1 (+)
Li-Ion
Overcharge /
Overdischarge
protection
Confidential Issue 2 09/2005