TCA9535: No pull-up/pull-down on input pins

Art,

Thanks for reaching out.

Leaving an input pin floating has a few common effects. First, it greatly increases current consumption by the device, since the input is sitting at midrail. Second, the input would be perceived as constantly toggling back and forth, trigging interrupts constantly. This would effectively render the interrupt function useless.

This is an example of a situation where current consumption was high, and it was determined to be caused by the floating input stages of the device:

Best,

Danny