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Thread: I2C Bus hangs

  1. #1
    Beginner Beginner amanning will become famous soon enough
    Join Date
    Oct 2015

    I2C Bus hangs

    I have noticed that the I2C Bus hangs if during the idle phase the clock line is disturbed by either an ESD pulse or unplugging.
    The status of the USIC does not change, so a problem cannot be detected, but the next transmission does not work. The Bus can be unblocked by pulling the data line low for a short pulse, afterwards the Bus works again as expected.
    Is this a know problem or bug? It seems as if the internal statemachine in the USIC gets into an incorrect state.

  2. #2
    Beginner Beginner andyl is on a distinguished road
    Join Date
    Sep 2015
    This seems a common problem and unfortunatly gets complety ignored by infineon engineers:
    Look for example here

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