Nokia 3710 fold, Руководство по обслуживанию

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Energy management
Battery and charging
BL-4S battery
The phone is powered by a 3-pole BL-4S 860 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 31 Battery pin order
The battery temperature can be measured from the UI flex.
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
This phone is charged through a separate charger connector.
Charging is controlled by energy management, and external components are needed to protect the baseband
module against EMC, reverse polarity and transient frequency deviation.
Complementary USB charging is supported as well, in case the phone is connected to a PC or to a dedicated
USB charger.
Normal and extreme voltages
Energy management is mainly carried out in the ASIC PEARL/GAZOO. These circuits contain a number of
regulators. In addition there are some external regulators.
In the table below normal and extreme voltages are shown when a BL-4S battery is used.
Table 11 Nominal voltages
Voltage Voltage [V] Condition
General Conditions
Nominal voltage 3.700
Lower extreme voltage 3.145
Higher extreme voltage (fast
charging) 4.230
HW Shutdown Voltages
RM-509; RM-510; RM-511
System Module
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