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TCA6424---->Interrupt Issue

Karthikeyan K
Prodigy 60 points
Other Parts Discussed in Thread: TCA6424

Hi All,

       Happy New Year Wishes to All.....

I am facing an issue in IO Expander TCA6424 while accessing the interrupt Pin. I have configured 3 Pins as input pins in the Port0 Configuraion register for detecting the Mic Jack. I can able to detect the input lines by reading the input Port 0 registers while inserting & removing the mic jack. But the Interrupt is not getting triggered by IO Expander to the Processor while inserting the Mic Jack. The interrupt line default state is high. It should be in low state while detecting the Jack.But it reamins always high  state only even i can able to detect the mic jack by reading the Input port0 resister.The Pull up resistor value is 4.7 k ohms which is connected in the Interrupt line. Will it cause the Probelm by acting as Strong Pull up?

Anyone can you help me to solve this issue?

Thanks In Advance

K.Karthikeyan

 

 

  • 0
    TI__Genius 9085 points

    Hello,

    The pull-up resistor is not a problem.

    This is a known behavior with the TCA6424. A STOP event by any device on the I2C line causes it the TCA6424 to clear the INT.

    Adding an addition clock pulse after a stop event will prevent the INT from de-asserting.