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Does TLIN1029-Q1(or TLIN2029-Q1) support K-line?

Other Parts Discussed in Thread: TLIN2029-Q1, TLIN1029-Q1

Hello Team,

Thanks for your support.

I have one question about TLIN1029-Q1 and TLIN2029-Q1.

Q. Can these devices support ISO9141 (K-line)?


Yuta Kurimoto

  • Kurimoto-san,

    In general, yes, most LIN transceivers can support the K-line interface application electrically and functionally. However, more intelligent LIN transceivers aren't the best option for two big reasons:

    • For any K-line application that has a slow bit rate (10-50hz) or extended dominant pulses, the dominant timeout function on these transceivers will cause problems. Once this timeout is triggered, the bus will go recessive and stay there until another driven recessive to dominant pulse is seen by the bus.
    • In K-line applications, the master node has a 510 ohm pull-up, and the slave nodes are in a high-impedance pull up state (>100k ohms). For LIN transceiver, to adhere to the spec they have 20k ohms to 60k ohms impedance on the bus, TLIN1029-Q1 and TLIN2029-Q1 included. So while this won't cause immediate issues, you have to be careful about how many LIN transceivers are connected to the bus, as to not lower the effective bus impedance, and source more current from the drivers than they're specified to support.


  • Hello Eric,

    Thanks for your clear answer. I understood well.

    Yuta Kurimoto