Normal And Extreme Voltages - Nokia 2700c-2 Service Manual

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.

Normal and extreme voltages

Energy management is mainly carried out in the two Application Specific Integrated Circuits (ASICs) N2300
BETTY and N2200 AVILMA. These two circuits contains a number of regulators. In addition there are some
external regulators too.
In the table below normal and extreme voltages are shown when a BL-5C/BL-5CA battery is used.
Voltage
Nominal voltage
Lower extreme voltage
Higher extreme voltage (fast
charging)
Vmstr+
Vmstr-
Sw shutdown
Sw shutdown
Page 5 –8
Figure 26 Battery connector
Table 7 Nominal voltages
Voltage [V]
General Conditions
4.0
3.145
4.230
HW Shutdown Voltages
2.1 ± 0.1
1.9 ± 0.1
SW Shutdown Voltages
3.106
3.2
Min Operating Voltage
COMPANY CONFIDENTIAL
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Condition
Off to on
On to off
In call
In idle
RM-561
System Module
Issue 1