Charger Detection - Nokia RH-44 Series Troubleshooting - Bb

CCS Technical Documentation
V100

Charger Detection

Connecting a charger creates voltage on VCHAR input of the UEM. When VCHAR input
voltage level is detected to rise above 2 V (VCHdet+ threshold) by UEM charging starts.
VCHARDET signal is generated to indicate the presence of the charger for the SW. The
charger identification/acceptance is controlled by EM SW.
The charger recognition is initiated when the EM SW receives a "charger connected"
interrupt. The algorithm basically consists of the following three steps:
1 Check that the charger output (voltage and current) is within safety limits.
2 Identify the charger as a two-wire or three-wire charger.
3 Check that the charger is within the charger window (voltage and current).
If the charger is accepted and identified, the appropriate charging algorithm is initiated.
Tom ahawk Charger
connector
X102
+ VCHAR
GND
Issue 1 04/2003
Figure 15: Charging circuitry
F100
L100
________
42R/100MHz
1.5A
C106
1n0
Figure 16: Charging circuit
Nokia Corporation
Troubleshooting — BB
R200
V100
1PMT16AT3
GND
Confidential
RH-44
battery
0
1
2
CHARGER(4:0)
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