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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.
