User Guide

• VBAT (Battery voltage)

The BSI line is used to recognize the battery capacity by a battery internal pull down resistor.

Figure 50 Blade battery connector

Charging

This phone is charged through the smaller Nokia standard interface (2.0 mm plug). The wider standard

charger (3.5 mm) can be used together with the CA-44 charger adapter.

Figure 51 Small (right) and wide (left) charger plugs

Charging is controlled by energy management, and external components are needed to protect the baseband

module against EMC, reverse polarity and transient frequency deviation.

Backup battery

When the main battery is not attached EM ASIC (N2200) goes in backup mode using back-up battery that

supplies voltage to RTC in EM ASIC (N2200).

Normal and extreme voltages

Energy management is mainly carried out in the two Application Specific Integrated Circuits (ASICs) BETTY

and 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 BP-6MT S-pack battery is used.

Table 15 Nominal voltages

Voltage Voltage [V] Condition

General Conditions

Nominal voltage 3.700

Lower extreme voltage 3.145

Higher extreme voltage

4.230(fast charging)

RM-244

System Module and User Interface

Page 6 –8 COMPANY CONFIDENTIAL Issue 1