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TCA9539: /INT signal when SCL is not supplied.

Yusuke Mukuno
Expert 7395 points
Part Number: TCA9539

Hi

Could you please let me know about the behavior of /INT signal when SCL is not supplied? It is not asserted. Is it correct?

If IN signal is inputted when SCL is not supplied. Then /INT pin will be asserted when SCL is supplied?

At reset, the I/Os are configured as inputs, right?

Muk

  • 0
    TI__Mastermind 49040 points

    Hey Muk,

    "At reset, the I/Os are configured as inputs, right?"

    That is correct.

    "Could you please let me know about the behavior of /INT signal when SCL is not supplied? It is not asserted. Is it correct?"

    The INT circuitry should assert/de-assert regardless of SCL being high or low. Only during the 9th clock  (ACK) of a input read does the INT reset. You should think of the INT as independent from the SCL unless there is an ACK.

    -Bobby

  • 0 in reply to BOBBY
    TI__Expert 7395 points

    Bobby-san

    Thank you your your answer! 

    Muk