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TCA6424A: Interrupt function check

Jim Tsai
Expert 4470 points

Part Number: TCA6424A

Hi,

I have some questions as below, please help on this, thanks.

1. Does pin32 INT applied to all I/O ports pin1~pin27?

2. pin32 INT could connect to CPU's GPIO as interrupt, right?

3. pin29 and 30 I2C could connect to CPU, right?

  • 0
    TI__Guru 56058 points

    Hi Jim,

    I will get a response to you by close of business Monday, 11/27.

    Regards,

    Tyler

  • 0
    Guru 320520 points

    1. Yes.

    2. Yes, with a pull-up resistor.

    3. Yes, they are standard I²C pins.

    Also see the typical application in figure 9-1.

  • 0
    TI__Guru 56058 points

    Hi Jim,

    To double confirm with the help from Clemens...

    Jim Tsai said:
    1. Does pin32 INT applied to all I/O ports pin1~pin27?

    Yes. /INT is triggered via a change from the original state on a p-port configured as an input. 

    Jim Tsai said:
    2. pin32 INT could connect to CPU's GPIO as interrupt, right?

    Yes. This is usually the intended purpose is to connect the /INT as a "flag" output to the input of an MCU/CPU so that the controller device can service the interrupt on the IO expander to determine what input pin changed state. 

    Jim Tsai said:
    3. pin29 and 30 I2C could connect to CPU, right?

    Pin 29 and 30 (SCL and SDA) should connect to the I2C bus of the CPU, or GPIO pin with compatible I2C drivers. Also ensure that there are pull-up resistor connections on these signal wires. 

    Regards,

    Tyler