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RM-272; RM-273
System module
• Audio block
• SIM
• FM radio
Modes of operation
The functional behavior can be divided into seven different states. Each of these states will affect the general
functionality of the phone:
• No supply
• Backup
• Power off
• Reset
• Power on
• Deep sleep
Battery and charging
Battery
• Type: BL-4C, Li-Ion
• Capacity: 860 mAh
• BSI resistor nominal value: 75 kΩ
Battery temperature is measured on the NTC on the main board.
Battery connector
The battery connector has three poles:
• 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 the smaller Nokia standard interface (2.0 mm plug). The old standard charger
(3.5 mm) can be used together with the CA-44 charger adapter.
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