Charging Operation; Battery - Nokia NPD-4 Series Troubleshooting - Bb

CCS Technical Documentation

Charging operation

Battery

A 950 mAh Lithium-Ion cell battery is used. Reading a resistor inside the battery pack on
the BSI line indicates the battery size. NTC-resistor inside the battery measures the bat-
tery 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. Phone has 100 kΩ pull-up resis-
tors for these lines so that they can be read by A/D inputs in the phone.
Issue 1 02/2003
Figure 12: 32kHz analog waveform at 32KHz crystal input
4(GND) 3(BTEMP)
Figure 13: BLC-2 battery pack pin order
Nokia Corporation
Troubleshooting — BB
2(BSI) 1 (+)
Confidential
NPD-4
Page 19