The battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line.
This is located on the main PWB, at the place where the phone temperature is closest to the battery
temperature.
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 50 Blade battery connector
Charging
This phone is charged through the smaller Nokia standard interface (2.0 mm plug). The wider standard
charger (3.5 mm) can be used together with the CA-44 charger adapter.
Figure 51 Small (right) and wide (left) charger plugs
Charging is controlled by energy management, and external components are needed to protect the baseband
module against EMC, reverse polarity and transient frequency deviation.
Normal and extreme voltages
Energy management is mainly carried out in the EM ASIC (N2200). 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 BP-6MT battery is used.
Table 12 Nominal voltages
Voltage
Voltage [V]
Condition
General Conditions
Nominal voltage
3.700
RM-424; RM-564
System Module
Issue 1
COMPANY CONFIDENTIAL
Page 6 –9
Copyright © 2009 Nokia. All rights reserved.
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