Energy Management; Battery And Charging; Normal And Extreme Voltages - Nokia 6267 RM-210 Service Manual

RM-210
System Module

Energy management

Battery and charging

Battery
• Type: BL-5C, Li-Ion
• Capacity: 1020 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).
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 battery is used.
Voltage
Nominal voltage
Lower extreme voltage
Higher extreme voltage
(fast charging)
Vmstr+
Issue 1
Figure 18 Battery BL-5C
Table 9 Nominal voltages
Voltage [V]
General Conditions
3.700
3.145
4.230
HW Shutdown Voltages
2.1 ± 0.1
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