Normal And Extreme Voltages; Power Key And System Power-Up; Modes Of Operation - Nokia 3600 Slide Service Manual

RM-352; RM-354
System Module
• 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 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-4S battery is used.
Voltage
Nominal voltage
Lower extreme voltage
Higher extreme voltage (fast
charging)
Vmstr+
Vmstr-
Sw shutdown
Sw shutdown
Vcoff+
Vcoff-

Power key and system power-up

When the battery is placed in the phone the power key circuits are energized. When the power key is pressed,
the system boots up (if an adequate battery voltage is present).
Power down can be initiated by pressing the power key again (the system is powered down with the aid of
SW). The power key is connected to EM ASIC N2200 (AVILMA) via PWRONX signal.

Modes of operation

Mode
NO_SUPPLY (dead) mode means that the main battery is not present or its voltage is too low (below
N2200 AVILMA master reset threshold) and that the back-up battery voltage is too low.
Issue 1
Table 7 Nominal voltages
Voltage [V]
General Conditions
4.0
3.145
4.230
HW Shutdown Voltages
2.1 ± 0.1
1.9 ± 0.1
SW Shutdown Voltages
3.106
3.2
Min Operating Voltage
2.9 ± 0.1
2.6 ± 0.1
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Condition
Off to on
On to off
In call
In idle
Off to on
On to off
Description
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