PDM15 Firmware Bug
I recently discovered a bug in the PDM15 firmware.
As some background, I have the PDM15 set up in my car with a physical cutoff switch between the PDM and the battery. This disconnects the battery from the PDM, the Alternator, and will sink any current left in the system to a resistor when turning the switch off, thus safely killing the car.
While adjusting the configuration in the PDM, I had my laptop connected via USB and flipped the kill switch but the car continued to run. Looking at the display, I was able to see that the voltage dropped to the normal USB voltage, around 0.5V, and the current spiked to over 28 amps. I didn't let it run for long before turning the kill switch back on and letting everything run at the normal voltage.
Shouldn't the normal operation of the PDM be that once the switched 12V power is shut off that ALL outputs are killed at the same time?
If you want to protect the outputs from doing anything odd then just add to your logic for each output that battery voltage needs to be above 7v say and then that way if input voltage drops below that value for whatever reason then the output won't come on anyhow.....