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TCA6424A: How to make the initial condition low.

Anoop M
Intellectual 475 points
Part Number: TCA6424A

Hi,

We have connected the Power good signal to the io expander with 3.3v pull-up,
in the initial state, all the regulators(dc-dc) pg are low.

But the output of the io expander looks high initially. How to make the initial condition low.

Regards,

Anoop

  • 0
    TI__Mastermind 30906 points

    Hi Anoop,

    The I/O ports are set as input by default and are in a high-Z state. However a weak pulldown can be added to boot the ports up in a low state as desired.

    From the schematic, R12 can be removed as the ADDR pin can be tied directly to GND. 

    Regards,

    Jack