Backup Battery; Normal And Extreme Voltages - Nokia 2608 Service Manual

RM-376
System Module and User Interface
Charger Control
In active m ode, ch
limit cha rg ing into
Cut Off MaxCurrent = 1.5A
Max Voltage= 6.6V

Backup battery

When the main battery is not atta
supplies voltage to RTC in EM ASIC (N
Normal and extreme voltag
Energy management is mainly carri
AVILMA. These two circuits contain a
In the table below, normal and extre
Voltage
Nominal voltage
Lower extreme voltage
Higher extreme voltage
(fast charging)
Vmstr+
Vmstr+
Sw shutdown
Sw shutdown
Vcoff+
Vcoff-
Issue1
arging is controlled by charging IC. Charging
a safe area.
ched EM ASIC (N2200) goes in backup mode using back-up battery that
2200).
es
ed out in the two Application Specific Integrated Circuits (ASICs) BETTY
number of regulators. In addition there are some external regulators to
me voltages are shown when a BL-5BT battery is used.
HW Shutdown Voltages
SW Shutdown Voltages
Min Operating Voltage
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Voltage [V]
General Conditions
3.7
3.145
4.230
4.230
2.1 ± 0.1
2.1 ± 0.1
3.20
3.20
2.9 ± 0.1
2.6 ± 0.1
voltage and current monitoring are used to
Condition
Off to on
Off to on
In call
In idle
Off to o
On to off
and
o.
n
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