TCA9555: TCA9555 application question

Chen Bogey8

Mastermind 9990 points

Part Number: TCA9555

Hi Sir

TCA9555 port for interrupt input, but TCA9555 send the interrupt output while the input rise edge and fall edge.

It cause the INT output send the interrupt two times when the interrupt input assert .

Have any solution or suggestion?

Bogey

over 7 years ago

0 BOBBY over 7 years ago

TI__Guru* 78111 points

Hi Chen,

Do you have scope shots of this happening and what pin is causing this?

The INT should be low when an INPUT changes and will be high if you do a read of the input ports OR if the input goes back to its previous state.

Thanks,
-Bobby

0 Miguel Robertson over 7 years ago in reply to BOBBY

TI__Guru 62920 points

Hi Bogey,

Are you able to measure the signals on an oscilloscope as Bobby had requested? This should help give us a better understanding of the behavior.

Thanks,
Max

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TCA9555: TCA9555 application question