Adc-Reading; Backup Battery - Nokia NHL-2NA Series Troubleshooting Instructions

CCS Technical Documentation

ADC-reading

Divided and scaled battery voltage, Charger voltage, Charger current, BSI and Btemp val-
ues can be read by this tool. Read values few times before you can be sure that results
are accurate.
Note:: If Vbatt Scaled and Divided unit results are different default calibration values
are used. In this case perform EM-calibration to get full performance of phone.
Maximum tolerances are:
Reading
Vbatt SCAL
Vchar
Ichar
BSI
Btemp

Backup battery

Symptom of backup battery fault is:
Real Time Clock loses the correct time during short main battery removal.
The same syptom can also be seen when the backup battery is empty. About 5 hours is
needed to fully charge the backup battery in the device. NOTE: Backup battery is charged
only the same time with main battery charging. Or when the device is LOCAL or TEST
mode.
Issue 1 07/02
Figure 4: ADC-readings view
Check point
4.2V
8.4V
500mA
68k(BLB-2)
273K(47k)
¤Nokia Corporation
Tolerance
± 25mV
± 40mV
± 20mA
± 1.3kohm
± 5K
NHL-2NA
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