Power Key - Nokia n80 User Manual

RM-91; RM-92
System Module
Mode
SLEEP SLEEP mode is entered only from PWR_ON mode with the aid of SW when the system's
activity is low. There are in principle three different sleep modes:
• application processor sleep
• RAP sleep
• application processor and RAP sleep (deep sleep)
In SLEEP mode N2200's regulators VIO, VDRAM, VSIM1, and Vana are in low quiescent
current mode (output voltages still present but regulators will not give as much current
out). VSIM2 is permanently off, and VAUX is always in the power on mode. Other
regulators including VR1 supplying system clock oscillator are disabled.
In SLEEP mode, EM ASIC N2300 VCORE SMPS regulator is in low quiescent current mode
(if sleep mode is not internally disabled). Linear regulator VOUT state depends on the
accessory connected to the system connector, if there is any.
FLASHING FLASHING mode is for SW downloading.
Voltage limits
Parameter
VMSTR
VMSTR+
VMSTR-
VCOFF+
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, 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.
Issue 1
Description
Master reset threshold (N2200)
Threshold for charging, rising
(N2300)
Threshold for charging, falling
(N2300)
Hardware cutoff (rising)
Hardware cutoff (falling)
SW cutoff limit
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Description
2.2V (typ.)
2.1V (typ.)
1.9V (typ.)
2.9V (typ.)
2.6V (typ.)
~3.2V
Nokia Customer Care
Value
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