Advantech TREK-743 User Manual download pdf (Page 50)

TREK-753 User Manual 42

5.4 Power Management

5.4.1 Power Management Mechanism

The Power Management feature is provided for users to fulfill special requirements

for different applications.

 Ignition on/off:

– Turn on the system by ignition

In the case of applications, an ignition signal is often used to turn on or shut-

down the system. When the system is in an OFF state and the ignition is

turned ON, the VPM controller will countdown to ON_DELAY; once it counts

to zero, the system will be turned on.

– Shutdown the system by ignition

When the system is powered on and the ignition is turned off, the

OFF_EVENT_DELAY will start to count down. During this stage, if the igni-

tion is switched back to ON, the VPM controller will stop countdown and reset

the OFF_EVENT_DELAY value. If OFF_EVENT_DELAY counts to zero, the

VPM controller will send an event (power button press) to the system and

start to count HARD_OFF_DELAY. Application programs can watch this

event and do pre-defined tasks, like storing data and preparing to turn off the

system.

Once going into the HARD_OFF_DELAY stage, this process cannot be

reversed. If HARD_OFF_DELAY counts to zero, the system power will be cut

off abruptly.

 Low power protection:

To avoid draining power, low-power protection is ensures their is enough power

to start the vehicle. When the system is ON, the VPM controller will monitor the

power voltage. If the voltage is lower than the programmable 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 voltage

goes 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 the

power.

The table below lists the user programmable parameters for VPM features:

Default value Acceptable range

ON_DELAY 2 seconds 1 ~ 18000 seconds

OFF_EVENT_DELAY 5 seconds 1 ~ 18000 seconds

HARD_OFF_DELAY 60 seconds 1 ~ 18000 seconds

LOW_THRESHOLD (12V mode) 11.42 V 10.09 ~ 12.25 V

LOW_THRESHOLD (24V mode) 22.44 V 21.11 ~ 23.28 V

LOW_DELAY 30 seconds 1 ~ 3600 seconds

LOW_ HARD_DELAY 60 seconds 1 ~ 3600 seconds

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 74 75

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Advantech TREK-743 User Manual Page 50

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