Nokia E72, Руководство по обслуживанию

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Energy management
Battery and charging
BP-4L battery
The phone is powered by a 3-pole BP-4L 1500 mAh battery. The three poles are named VBAT, BSI and GND
where the BSI line is used to recognize the battery capacity. This is done by means of an internal battery pull
down resistor.
Figure 28 Battery pin order
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.
Charging
The phone is charged through the charging connector and micro USB interface.
Charging is controlled by energy management, 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. Charging of a dead battery
via a PC is not allowed since this procedure is not including a current regulator (the battery can be charged
with a too high current level).
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-4L battery is used.
Table 12 Nominal voltages
Voltage Voltage [V] Condition
General Conditions
Nominal voltage 3.700
Lower extreme voltage 3.5
RM-529; RM-530; RM-584
System Module
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