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 26 Battery connector
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.
Table 7 Nominal voltages
Voltage Voltage [V] Condition
General Conditions
Nominal voltage 4.0
Lower extreme voltage 3.145
Higher extreme voltage (fast
charging) 4.230
HW Shutdown Voltages
Vmstr+ 2.1 ± 0.1 Off to on
Vmstr- 1.9 ± 0.1 On to off
SW Shutdown Voltages
Sw shutdown 3.106 In call
Sw shutdown 3.2 In idle
Min Operating Voltage
RM-561
System Module
Page 5 –8 COMPANY CONFIDENTIAL Issue 1
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