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Here's a fun one. The old GPIO expander that we had in revC0 for pull-up control gets slightly warm when not doing anything. Ground all the I/Os and it immediately cools down. Looks like those input buffers have high leakage when the input is floating!pic.twitter.com/fGxdlvlqCX
Interestingly, the new revC1 part (which has been retrofitted to this revC0 unit to the left, on the B side) does not have this problem, at least at whatever level the I/Os naturally float to when disconnected and powered at 3.3V.
What I see there is Spiderman hanging upside down and Jane approaching for a comfortless kiss 
What did you use to take this video?
Looking for a FLIR cam, but every single one I found was **slightly** over budget
It's the original/old Seek Thermal.
It is typical for CMOS inputs to oscillate and increase power consumption when not driven. Always pull up/down or set as outputs unused pins!
I'm not sure if it was oscillating or just just leaking through the input buffer. It's one of those things I learned like 15 years ago, but never had the chance to observe in such an obvious fashion :-)
Floating inputs may amplify noise and keep the gate switching instead of still, which usually draws more power.
I don't think external noise causing switching accounts for this (~20mA consumption). It's more likely input buffers that are in an intermediate state and conducting across the supply rail.
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