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TCA6424A Interrupt Signal

Raja Ashutosh Kedia
Intellectual 430 points


Hi,

We see that there is an INT signal on TC6424A, which triggers when there is any change in inputs. As per the post on   https://e2e.ti.com/support/interface/i2c/f/390/t/518072 it is mentioned to provide external pull-up on unused pins to avoid false interrupts. We are planning to program the unused pins as outputs instead of providing external pull-ups, do you see any issue with this regarding INT pin behaviour?

  • 0
    TI__Genius 16550 points
    Raja,

    There are no issues with setting the unused pins to outputs to avoid false interrupts.

    I have 1 suggestion/concern, though.

    After power up, all pins will default to input mode, and unused pins will be floating. This will cause higher ICC and possibility of a false interrupt before you configure the pins. If you are OK with these potentials, then you are fine setting the unused pins as outputs.