NHL-10
CCS Technical Documentation Baseband Troubleshooting
16 COMPANY CONFIDENTIAL ISSUE 2 01/2004
Copyright © 2003 Nokia. All Rights Reserved.
Figure 10: ADC-reading view
Backup battery
Symptom of backup battery fault is:
Real Time Clock loses the correct time during a short main battery removal.
The same symptom can also be seen when the backup battery is empty. About 5 hours is need-
ed to fully charge the backup battery in the device.
Note: The backup battery is charged only at the same time with main battery charging. Or when the
device is in LOCAL or TEST mode.
Table 1: Maximum tolerances
Reading Check point Tolerance
Vbatt SCAL_ 4.2V ±25mV
Vchar 8.4V ±40mV
Ichar 500mA ±20mV
BSI 75k (BL-5C) ±1.3kohm
Btemp 273K (47k) ±5K
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