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Original question:

TUSB422: UFP mode is stuck during initialization phase

TUSB422: INT_IN no connect

Shreenidhi Patil
Expert 3946 points
Part Number: TUSB422

Hello Team , 

my top assigned account is planning to use the TUSB422 for TYpe C PD negotiations in a sink only device .


Can they configure to make sure the INT_IN pin is not connected to any uC .

Due to their manufacturing capability limitations they are unable to make connections to the INT_IN pin hence wish to leave it floating .

please let me know your views .

  • 0
    TI__Guru**** 177396 points
    Shreenidhi

    The TUSB422 asserts the INT_N pin low anytime an unmasked event occurs. Upon assertion of the interrupt, the TCPM should read the Alert Registers to determine the reason for interrupt.

    Without INT_N, how do they plan to handle the Alert? If they plan to constantly poll the Alert Register, this will become a huge overhead for the uC.

    Thanks
    David