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.