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16Bits IO Expander - TCA9535

Tze Khong Yap
Prodigy 245 points
Other Parts Discussed in Thread: TCA9535

My customer plan to apply 16 Bits IO expander TCA9535 to their Microcontroller block.

According TCA9535 datasheet, the INT pin of the GPIO extender is recommended to connected to the INT pin of the Master Controller.

Is it necessary to connect this INT pin to their INT pin of microcontroller?

If their microcontroller does not have INT pin? Any other pin is recommend to connect this INT pin?

Thanks.

  • 0
    TI__Intellectual 2286 points

    Hello Tze Khong Yap,

    If the microcontroller does not have an INT pin, there is no need to connect it to any other port. The INT pin is if you want to control our device through interrupts, where if an action occurs, it will notify the processor to poll the TCA9535. If this is not desired, then you can leave the INT pin alone without affecting device performance.

     

    Thanks! Dwight