Normal And Extreme Voltages - Nokia RM-627 Service Manual

• GND (Ground)
• 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 the micro USB interface.
Charging is controlled by EM ASIC (N2200), and external components are needed to protect the baseband
module against EMC, reverse polarity and transient frequency deviation.
Charging a dead battery
Charging of a dead battery has to be carried out via an approved NOKIA charger. Charging of a dead battery
via a PC is not allowed, since this procedure does not including a current regulator (the battery can be charged
with a too high current level).

Normal and extreme voltages

Energy management is mainly carried out in the EM ASIC (N2200). that contains a number of regulators. In
addition there are also some external regulators.
In the table below normal and extreme voltages are shown when a BL-5F battery is used.
Voltage
Nominal voltage
Lower extreme voltage
Higher extreme voltage
(fast charging)
Vmstr+
Vmstr-
Sw shutdown
Sw shutdown
Vcoff+
Vcoff-
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Figure 31 Blade battery connector
Table 10 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
3.1
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
RM-627
System Module
Issue 1