Advantech TREK-674, Manual

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