Battery connector
The battery connector is a blade connector. It has three blades;
•
BSI (Battery size indicator)
•
GND (Ground)
•
VBAT (Battery voltage)
The BSI line is used to recognize the battery capacity by a battery internal pull down resistor.
Figure 10 Blade battery connector
Charging
This phone is charged through the smaller Nokia standard interface (2.0 mm plug). The wider standard
charger plug (3.5 mm) can be used together with a CA-44 charger adapter.
Figure 11 Small (right) and wide (left) charger plugs
The phone can also be charged via USB.
Charging is controlled by EM ASIC, and external components are needed to protect the baseband module
against EMC, reverse polarity and transient frequency deviation.
Charging a dead battery
Charging of a dead battery has to be carried out via an approved NOKIA charger.
Normal and extreme voltages
Energy management is mainly carried out in the EM ASIC that contains a number of regulators. In addition
there are also some external regulators.
In the table below normal and extreme voltages are shown when a battery is used.
Table 5 Nominal voltages
Voltage Voltage [V] Condition
General Conditions
RM-781
System Module
Issue 1 COMPANY CONFIDENTIAL Page 5 – 7
Copyright © 2011 Nokia. All rights reserved.
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