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DS90UH948-Q1: Support ASIL-B

Lawrence He
Genius 3115 points
Part Number: DS90UH948-Q1
Other Parts Discussed in Thread: TCA9539

Hi, Support Team

For Support ASIL-B so we need add MCU to monitor active parts.

UH948 is Master through I2C control I/O expander

MCU is Master through I2C read UH948 register confirm status 

But UH948 only have one I2C, its could workable? if cannot have other way?(change to UH988?)

Function block as below chart:

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

  • 0
    TI__Mastermind 33485 points

    Hi Lawrence,

    For the UH948, you would need to have the MCU and the I/O expander on the same I2C bus since there is only one I2C interface.

    Is the main concern that the MCU and 948_BL_FAULT would interfere with each other?

    Regards,

    Jack

  • 0 in reply to Jack Scherlag
    Genius 3115 points

    Hi, Jack

    Yes, we main concern the MCU and 948 would interfere with each other.

    if any suggestion, Please advise me.

    Thanks,

    Best regards,

    Lawrence

  • 0 in reply to Lawrence He
    TI__Mastermind 33485 points

    Hi Lawrence,

    I'm still confused on how exactly the MCU and 948 would interfere with each other. Could you give me a specific situation which could cause this?

    Is the TCA9539 only handling the two signals in the diagram? I'm not sure why an I/O expander is needed.

    My assumption so far is that you want to free up the 948 from talking to the I/O expander to communicate with the MCU. If so, you could have the MCU trigger the INTB_IN interrupt which will propagate downstream to the serializer which I assume is transmitting the I2C commands to the 948. This interrupt would tell the serializer to stop writing and reading to the 948 and let the MCU communicate with the 948.

    Is this scenario correct?

    Regards,

    Jack