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i2c based interrupt handler

yaseer zakaria
Prodigy 120 points
Other Parts Discussed in Thread: TCA6416A

Suggest me a TI competitive product to SX1503 or SX1506 from Semtech.

i want a I2c based interrupt handler capable of handling 16 interrupts.

Also each interrupt should be programmable for rising or falling edge as Semtech provides.

Kindly suggest.

 

  • 0
    TI__Expert 6395 points

    Hello Yaseer,

    The TCA6416A will be our closest match.

    Regards,

    Andrew

  • 0 in reply to Andrew_Mason
    Prodigy 120 points

    Hello Andrew,

    i explain you my application.

    I have certain active low interrupts coming on port pins. Port pins will be default pulled high via external pullup.

    Consider a keypad of 16 switches. Logic low when switch pressed.

    I want that interrupt be generated only on falling edge of these port pins and not in other cases like rising edge, etc.

    And then via I2C the processor will read the status and realize which port pin generated the interrupt. 

    But using this chip i guess an interrupt will be generated twice once on falling edge and once on rising edge.

    Correct me if i am wrong.

    Can the device be configured only for falling edge and if yes then how?

    Also the datasheet says: Resetting the interrupt circuit is achieved when data on the port is changed to the original setting or when data is read from the port that generated the interrupt.

    So if the port pin again becomes logic high before the processor reads it then the interrupt may be lost.

    Correct me if I am wrong

    Kindly reply