Power Distribution; Power Key - Nokia RM-132 Service Manual & Parts Manual

RM-132; RM-133
System Module
Parameter
VCOFF-
SWCOFF
The master reset threshold controls the internal reset of EM ASICs. If battery voltage is above VMSTR, N2300
charging control logic is alive. Also, the RTC is active and supplied from the main battery. Above VMSTR, N2300
allows the system to be powered on although this may not succeed due to voltage drops during start up. SW
can also consider battery voltage too low for operation and power down the system.

Power key

The system boots up when power key is pressed (adequate battery voltage, VBAT, present).
Power down can be initiated by pressing the power key again (the system is powered down with the aid of
SW). Power on key is connected to the EM ASIC N2200 via PWRONX signal.

Power distribution

Power supply components
• EM ASIC N2200
• EM ASIC N2300
• Application processor VCORE SMPS, N4200
Issue 1
Description
Hardware cut off (falling)
Software cut off limit
Figure 77 Power distribution diagram
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Value
2.6 V (typ.)
~3.2 V
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