Trouble Shooting Guide, Advanced
4/00021-3/FEA 209 544/25 C
Ericsson Mobile Communications AB
16(78)
6 Current Calibration
6.1 How does it work
A simplified schedule for the regulation of the charging current is shown below, Fig. 6.1.
Fig. 6.1
The information about the charging current is achieved by measuring the potential drop over
the resistor R727.
ThecurrentflowICHismeasuredintheADCandisconvertedtoI
2
C data that is transferred
to D600.
V720 and the regulator-control in N700 regulate the charging.
6.2 How do you perform a current calibration
Start the board in EFRA with the test program.
Go to Logic \Current calibration.
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