I noticed that the Ignition Input line will power up the PDM, even when the main battery terminal and the USB port are disconnected. What is the max current draw that the PDM will draw through the ignition input? I ask because I'm planning to connect the ignition input to pin 4 of an MSEL battery isolator. But that is just a logic level output, it's current limited to 200mA. It isn't meant to be powering any device.
Hi Matt, it depends which PDM version you are using and also if you have anything hooked up to the 5V PDM output. The ignition input is what powers the internal electronics, and shouldn't draw more than 150-200mA under normal conditions. This is not guaranteed though, as the current draw is not constant, and can change dynamically based on what the PDM is doing. Also please remember that the ignition input ideally needs >6V to allow the CAN bus circuitry to work reliably. Regards, George
can the pdm monitor data from the msel like total draw and whatever else thru the canbus?
Since you are using an isolator, the Iginition Input pin can go to battery voltage.
The MSEL Pin 4 is an output to go to a PDM Input. It is used to shut down motor and log the CAN messages before disconnecting.