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TCA6424A: INT pin

Hirotaka Matsumoto
Guru 27585 points
Part Number: TCA6424A
Other Parts Discussed in Thread: TCA6424

Hi all

Would you mind if we ask TCA6424A?

1. P1X ～ P2X are output setting
2. Reset assgined(return to initial conditions)
3. P1X ～ P2X return to default setting(input setting)
4. After that, is resetting detected and is transmitted as INT?
Because, our customer would like to detect changing of the configuration setting from output setting to input setting using INT pin.
Could you give us the reply?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Mastermind 21575 points

    Hello Hirotaka-san,

    I believe you can do this if you allocate a pull-up or pull down resistor on the pin such that it has the opposite polarity than what it was as an output.  For example, if your pin is set as an OUTPUT = HIGH, then when it is reset you much have a pull-down resistor to put the pin LOW when it changes to an INPUT.  I will go in the lab to verify this and let you know.

    -Francis Houde

  • 0 in reply to fhoude
    Guru 27585 points

    Hello Francis san

    Thank you for your reply and your cooperation always!

    We would like to confirm one point, OUTPUT is not always High, there is the case OUTPUT=Low.
    So, is it suitable for both case?
    Because our customer uses outputs with low and high.
    And then, if there is no any pull-up or pull down resistor on the pin, we assume that it can't realize it.
    (On our customer's circuit, there are no pull-up or pull-down at outputs.)

    On the other hand, could you give us the reply about INT pin?

    We appreciate your help always.

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    Guru 27585 points

    Hi team

    We are so sorry to rush you, however if you have some update, could you give us it?
    Our customer needs this answer by next Monday.

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    Guru 27585 points

    Hi team

    Could you give us the reply?

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Guru 63000 points
    Hey Hirotaka-san,

    Sorry for the late reply. I've tested with the TCA6424 EVM. Looking at the INT pin, it's original state is high. By applying a reset and watching the INT pin, INT stays high during and after the duration. Is there anymore information you needed?

    Thanks,

    -Bobby
  • 0 in reply to BOBBY
    Guru 27585 points

    Bobby san

    Thank you for you reply!
    OK, we got it!

    Kind regards,

    Hirotaka Matsumoto