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Low Battery Protection
System stays ON
Low Battery is
Detected
When the system is ON, and
(1) The battery voltage (DC input) is lower than LOW_THRESHOLD (at T
(2) and this situation lasts for LOW_DELAY,
, then the system will send Power Button signal to OS (at T
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.
Note:
Q1: How is the low-battery event raised or canceled?
A1: The minimum value on LOW_DELAY parameter is 1 second. If the voltage remains
lower than the LOW_THRESHOLD in the duration of LOW_DELAY, the low-battery
event will be raised and immediately send a power button press signal to OS.
During the duration of LOW_DELAY, if the battery voltage is back to be higher than
LOW_THRESHOLD, the LOW_DELAY will be reset to predetermined value and stop
count down.
Therefore, the LOW_DELAY parameter acts as a filter to prevent incorrect
low-battery-event from happening.
4.3.2
Power Management demo program
TREK V3 VPM Sample Code
TREK V3 VPM Sample Code is demonstration of vehicle power management (VPM).
System Menu
TREK V3 VPM Sample Code as below figure
42
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LOW _DELAY
T
6
LOW_HARD_DELAY
T
7
Send Power
Button Signal
) to start the shutdown
7
T
8
System OFF
)
6
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