Backup Battery; Normal And Extreme Voltages - Nokia RM-506 Service Manual

• VBAT (Battery voltage)
Charging
This phone is charged through the micro USB connector. The phone supports dedicated, host or hub chargers.
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-4L battery is used.
Voltage
Nominal voltage
Lower extreme voltage
Higher extreme voltage
(fast charging)
Vmstr+
Vmstr-
Sw shutdown
Sw shutdown
Vcoff+
Vcoff-
Page 8 –10
Figure 61 Blade battery connector
Table 13 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
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System Module and User Interface
Condition
Off to on
On to off
In call
In idle
Off to on
On to off
RM-505; RM-506
Issue 1