Teensy 3.6 Parasitic Power?

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mhenstell

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Bit of a strange question - I have another device connected to most of the GPIOs on a Teensy 3.6. The device is externally powered. When I shut off power to the device, it seems that I'm still getting some parasitic power from the Teensy's GPIO pins. I've got all of the pins set to INPUT and I'm not using pull-ups. Unfortunately the device is on the other side of the country so I can't probe it.

Anything else I can try?
 
If they are INPUT, without pullup, the reason must be something different - not the GPIOs.
Can you post the schematic?
 
Sorry, figured it out - the UART is idle-high, and the other device is sucking power out of the teensy that way.
 
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