Normal And Extreme Voltages; Power Key And System Power-Up - Nokia RM-333 Service Manual

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 BL-5K 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.
The power key may be disabled in certain charging cases.
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Table 9 Nominal voltages
Voltage [V]
General Conditions
3.700
3.145
4.230
HW Shutdown Voltages
2.1 ± 0.1
1.9 ± 0.1
SW Shutdown Voltages
3.15
3.3
Min Operating Voltage
2.9 ± 0.1
2.6 ± 0.1
COMPANY CONFIDENTIAL
Copyright © 2008 Nokia. All rights reserved.
RM-333; RM-334; RM-335
System Module and User Interface
Condition
Off to on
On to off
In call
In idle
Off to on
On to off
Issue 2