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TLIN1029-Q1: LIN Slave and Master capacitor

DAYYAN SHERIFF
Prodigy 20 points
Part Number: TLIN1029-Q1

Why capacitor is required in LIN communication line?

If we add capacitor in the communication line, won't it increase the rise time and fall time.

Please explain.

  • 0
    TI__Guru 74172 points

    Dayyan,

    A capacitor on the LIN bus is not required for LIN communication to function correctly, and in fact that LIN specification sets a limit on the amount of line capacitance per LIN node and the overall bus capacitance. This is to eliminate the possibility of the RXD signal getting distorted due to asymmetry in the signal from, as you said, increasing the edge transitions.

    The capacitance is there to intentionally slow down the edges for improved EMC performance, and is recommended to help with this, but is not required. For a slave node, the maximum line capacitance is 250pF, and for a master node, the maximum capacitance isn't defined. The overall bus capacitance is limited to 10nF including all passive components, cabling, connectors, and transceivers.

    Please let me know if you have any questions or need further explanation.

    Regards,