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Low battery protection
To avoid draining out the car battery, low-battery protection is involved to ensure the
car battery is capable to start the vehicle. When the system is ON, the VPM controller
will monitor the car battery voltage. If the battery voltage is lower than a programma-
ble threshold (LOW_THRESHOLD), the VPM controller will go into LOW_DELAY
stage and start to count down. During the stage of LOW_DELAY countdown, if bat-
tery voltage is back above LOW_THRESHOLD, the VPM controller will stop counting
down and exit. If LOW_DELAY counts to zero, the VPM controller will send an event
(power button press) to notify the system, go into LOW_ HARD_DELAY stage and
start to count down. Once LOW_ HARD_DELAY counts to zero, the VPM controller
will cut off the system power abruptly to avoid draining out the car battery.
The table below lists the user programmable parameters for VPM features:
ON_DELAY
OFF_EVENT_DELAY
HARD_OFF_DELAY
LOW_THRESHOLD (12V mode)
LOW_THRESHOLD (24V mode)
LOW_DELAY
LOW_ HARD_DELAY
TREK-668/303 User Manual
Default value
2 seconds
5 seconds
60 seconds
11.42 V
22.44 V
30 seconds
60 seconds
38
Acceptable range
1 ~ 18000 seconds
1 ~ 18000 seconds
1 ~ 18000 seconds
10.09 ~ 12.25 V
21.11 ~ 23.28 V
1 ~ 3600 seconds
1 ~ 3600 seconds
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