User's Manual

49
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Low Battery Protection
When the system is ON, and
(1) The battery voltage (DC input) is lower than LOW_THRESHOLD (at T
6
)
(2) and this situation lasts for LOW_DELAY,
, then the system will send Power Button signal to OS (at T
7
) to start the shutdown process.
At this time (T7), the LOW_HARD_DELAY is starting to countdown.
Once LOW_HARD__DELAY is over, the system power is removed abruptly.
LOW_DELAY is ranged from 1 to 3600 seconds.
LOW_HARD_ DELAY is fixed with a value of 60 seconds.
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
6

T
7
T
8
SystemstaysON
LowBatteryis
Detected
SendPower
ButtonSignal
SystemOFF
LOW
_
HARD
_
DELAY
LOW
_
DELAY