Figure 21 Small (left) and wide (right) 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.
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 BP-5M S-pack battery is used.
Table 8 Nominal voltages
Voltage Voltage [V] Condition
General Conditions
Nominal voltage 3.700
Lower extreme voltage 3.145
Higher extreme voltage
4.230(fast charging)
HW Shutdown Voltages
Vmstr+ 2.1 ± 0.1 Off to on
Vmstr- 1.9 ± 0.1 On to off
SW Shutdown Voltages
Sw shutdown 3.1 In call
Sw shutdown 3.2 In idle
Min Operating Voltage
Vcoff+ 2.9 ± 0.1 Off to on
Vcoff- 2.6 ± 0.1 On to off
Power key and system power-up
When the battery is placed in the phone the power key circuits are energized (the phone doesn't have a
dedicated power key but the end call key is used). When the end call key is pressed, the system boots up (if
an adequate battery voltage is present).
RM-240
System Module
Issue 1 COMPANY CONFIDENTIAL Page 5 –11
Copyright © 2007 Nokia. All rights reserved.
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