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4.3.1 Power management Mechanism
Normal Power Management Flow
ON_DELAY
T
1
Ignition ON
System ON
Before T
The system stays off.
1
power is fed in, but Ignition is OFF.
T
Ignition is ON and the ON_DELAY is starting to count down.
1
T
~ T
This duration is and it is ranged from 1 to 18000 seconds.
1
2
T
Once the ON_DELAY is over, the system will stay On or OFF, depending
2
on the BIOS setting "POWER-ON after Power Fail".
If "POWER-ON after Power Fail" is set as ON, the system will be powered
ON.
If "POWER-ON after Power Fail" is set as OF, the system will stay OFF
and you could press the power button to turn on system.
T
~ T
The system is under normal operation.
2
3
T
At this time, the Ignition is OFF, and OFF_EVENT_DELAY is starting to
3
count down.
T
~ T
This duration is OFF_EVENT_DELAY and it is ranged from 1 to 18000
3
4
seconds.
T
When the OFF_EVENT_DELAY is over, the system will send a power
4
button signal to the OS and the user application should prepare the
shutdown process.
The HARD_OFF_DELAY is starting to count down.
T
~ T
This duration is HARD_OFF_DELAY and it is ranged from 1 to 18000
4
5
seconds.
T
When the HARD_OFF_DELAY is count to zero, the system power is
5
removed abruptly to avoid extra and abnormal power drain from battery.
This parameter is fixed with a value of 60 seconds.
After T
The system stays off.
5
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OFF_EVENT_DELAY
T
T
2
3
Ignition OFF
HARD_OFF_DELAY
T
4
Send Power
Button Signal
T
5
System OFF
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