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TLIN1027-Q1: K-line support inquiry

Jonathan Geronga
Expert 7930 points
Part Number: TLIN1027-Q1


Hi Team,

Our customer will be using TLIN1027-Q1 as LIN and they find this product supports K-line.
They would like to confirm if the schematic below needs changes for K-line support:

Please let me know your inputs.

Thanks,

Jonathan

  • 0
    TI__Genius 15345 points

    Hey Jonathan,

    This looks good, the only thing I would recommend is adding a decoupling capacitor to the VCC_PS_LIN trace right next to pin 7.

    Best,

    Chris

  • 0
    TI__Guru 74322 points

    Jonathan,

    Adding on to what Chris said, the TLIN1027-Q1 can indeed support K-Line applications, but it's important to know that it is not compliant with the K-Line spec and thus can never be considered a K-Line transceiver. One of my main reasons for this is the integrated pull-up resistor value difference between LIN responder nodes and K-line nodes.

    Functionally this will work, but the 1k pull-up needs to be removed, because the termination for K-line nodes is meant to be 100k ohms. And while this is more of a system-level specification for the overall bus impedance, having 1k termination at the node will severely limit the total number of K-line nodes that can exist in the system. The TLIN1027 transceiver typically has 45k pull-up internal, so even with the 1k pull-up resistor removed the system will still be limited, but the customer will be able to have many more nodes than if they terminated with the 1k pull-up.

    Please let me know if you have any other questions.

    Regards,