Installation manual

CarNetix CNX-P1290 V1.0 Installation Manual
7.0 CNX-P1290 Startup/Shutdown Controller
The CNX-P1290 includes an intelligent, microprocessor-based startup/shutdown controller. The
CNX-P1290 Startup/Shutdown Controller (SSC) provides safe, reliable control over your CarPC's
bootup and shutdown (full shutdown or hibernation) processes. The chief concerns of the SSC are
protecting your hard drive from corruption, protecting your car battery from being discharged, and
protecting the PSU from overheating.
7.1 Hibernate/Standby Operation
The CNX-P1290 supports both Hibernate and Standby operation of your CarPC. This option is
jumper selectable with Pins 5 & 6 on JP1.
When supporting Hibernation the P1290 completely shuts down all power to the CarPC after the
Shutdown Lockout State. However, if Standby mode is selected, the P1290 continues to provide
+12V after the Shutdown Lockout State is completed, but turns off its fans to conserve power. This
has several very important ramifications.
1) In Standby your CarPC continues to receive +12V power from the P1290 so that it can retain the
processor state in RAM. If for some reason the CarPC did not properly shut down when it received
the ACPI shutdown pulse from the P1290, it will continue to draw current from the P1290. THIS
WILL CAUSE THE P1290 TO OVERHEAT AND POTENTIALLY SELF-DISTRUCT. You
MUST make sure your CarPC properly enters the Standby State before you exit your car. If you
don’t, you may return to your car surrounded by the local fire department.
2) Any USB devices connected to your CarPC via the USB connector will continue to draw current
in the Standby state. THIS COULD POTENTIALLY DRAIN YOUR BATTERY IF THE
CURRENT DEMAND OF YOUR USB DEVICES IS VERY HIGH. Exercise caution when using
USB devices in the Standby mode.
Standby should only be used after you fully understand the above points. If you do not understand
the above information, DO NOT USE THE STANDBY MODE.
7.2 SSC Operation States
7.2.1 Idle State
While idle, the SSC monitors your car battery while waiting for the ignition switch to be turned on.
If the battery is below approximately 10.5 volts, the SSC will not allow the CarPC to boot. If the
battery is above 10.5 volts, the SSC will allow the CarPC to boot normally
.
7.2.2 RunDelay State
When you turn on your ignition, the SSC briefly (approx. 3 seconds) enters the RunDelay state.
During this time the SSC checks to make sure the battery is stable, the ignition stays on, and then
turns on its PSU output to the CarPC.
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