NRU Series
58
4.1.1
Additional Features of Ignition Power Control
In addition to the typical timing correlation, the ignition power control module offers
additional features to provide additional reliability for in-vehicle applications.
Low battery detection
The ignition power control module continuously monitors the voltage of DC
input when the system is operational. If input voltage is less than 9V (for
12VDC input) or less than 18V (for 24VDC input) over a 60-second duration, it
will shut down the system automatically.
Guarded power-on/ power-off delay duration
If ignition signal goes inactive during the power-on delay duration, the ignition
power control module will cancel the power-on delay process and go back to
idle status. Likewise if ignition signal goes active during the power-off delay
duration, the ignition power control module will cancel the power-off delay
process and keep the system running.
System hard-off
In some cases, system may fail to shutdown via a soft-off operation due to
system/ application halts. The ignition power control module offers a
mechanism called “hard-off” to handle this unexpected condition. By
detecting the system status, it can determine whether the system is shutting
down normally. If not, the ignition power control module will force cut-off the
system power 10 minutes after the power-off delay duration.
Smart off-delay
The ignition power control module offers two modes (mode 6 & mode 7) which
have very long power-off delay duration for applications require additional
off-line time to process after the vehicle has stopped. In these two modes, the
ignition power control module will automatically detect the system status
during the power-off delay duration. If the system has shutdown (by the
application software) prior to power-off delay expiring, it will cut off the system
power immediately to prevent further battery consumption.
