Charging Operation; Battery; Charging Circuitry - Nokia RH-66 Troubleshooting Manual

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Charging Operation

Battery

The 2115i/2116/2116i uses a Lithium-Ion cell battery with a capacity of 1070 mAh.
Reading a resistor inside the battery pack on the BSI line indicates the battery size. The
mobile terminal measures the approximate temperature of the battery on the BTEMP line
with an NTC resistor on the PCB.
The temperature and capacity information are needed for charge control. These resistors
are connected to the BSI pin of the battery connector and the BTEMP of the mobile
terminal. The mobile terminal has 100 kΩ pull-up resistors for this line so that they can
be read by A/D inputs in the mobile terminal.

Charging Circuitry

The UEMC ASIC charge control is dependent on the charger type and the battery size.
External components are needed for electromagnetic compatibility (EMC), reverse
polarity, and transient protection of the input to the baseband module. The charger
connection is through the system connector interface. The baseband supports DCT3
chargers, including both 2- and 3-wire type chargers. However, 3-wire chargers are
treated as 2-wire chargers.
Issue 1 03/2005
Figure 10: BL-6C battery pack pin order
©2005 Nokia Corporation
2115i/2116/2116i (RH-66)
Baseband Description and Troubleshooting
Company Confidential Page 19