Operation Modes - Nokia E62 Service Manual

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Parameter Description
Hardware
cutoff
VCOFF- (falling)
SW cutoff
SWCOFF limit
The master reset threshold controls the internal reset of N2200 / (N2300). If battery voltage is above VMSTR,
N2300's 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).

Operation modes

There are four different power up possibilities to switch power on:
• Power key is pressed
• Charger is connected
• A pulse is supplied to MBUS line (Clk)
• Internal power up with Real Time Clock alarm.
Power is not switched on by supplying battery voltage as in DCT4 generations
It should be noted that system behavior depends on the type of device the engine is in. The difference is
mainly in the power key concept, basically:
• The power key controls the system power ON/OFF
• The system boots up always when not empty battery is connected. The power key controls only the CMT
functionality. PDA functions are always available
• To the EM ASIC's functionality there is no difference how the power key is connected (the power up and
down signaling and timings are the same)
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Value
2.6V (typ.)
~3.2V
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System Module
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