Charging Circuitry; Charger Detection - Nokia NPD-1 Series Troubleshooting - Bb

NPD-1
Troubleshooting — BB

Charging circuitry

The UEM ASIC controls charging depending on the charger being used and the battery
size. External components are needed for EMC, reverse polarity and transient protection
of the input to the baseband module. The charger connection is through the system con-
nector interface. The baseband supports DCT3 chargers from an electrical point of view.
Both 2- and 3-wire type chargers are supported. For 3-wire charger, the control line is
ignored. See the following figure for details.
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.
Page 20
Figure 14: Interconnection diagram inside the battery pack
Figure 15: Charging circuitry
Nokia Corporation
CCS Technical Documentation
R200
Confidential
battery
Issue 1 11/2002