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TLIN2021A-Q1: LIN Bus Controller

Danilo A.
Mastermind 29260 points
Part Number: TLIN2021A-Q1


Hi Team,

Our customer wants the LIN bus to be isolated or cut-off from a Controller and make one of the Responder a Controller.

Do we have a buffer available for the LIN bus controller or a solution for this application?

Regards,

Danilo

  • 0
    TI__Genius 15345 points

    Danilo,

    That definitely seems possible. You are just going to need a switch to disconnect the main controller's 1K pull up and diode from the LIN bus. Then another switch to connect the 1K pull up and diode to the responder that you would like to make a commander. I'm sure there are many ways that a switch like this could be implemented. But keep in mind that all of these switches will be connected to VSUP so they have to be able to withstand the higher voltage and faults that the VSUP could see.

    I imagine you could use a FET for your switch. TI actually makes power switches. We even sell TLIN devices with built in HSS like the TLIN1431.

    I think a good idea here would be to implement the TLIN1431 which has a built in HSS to VSUP. Then you could connect the 1K pull up and diode to the LIN bus and when you want to make your responder a commander node you would just send a SPI command or control the HSSC pin and turn on the HSS. This would connect the 1K pull up and the diode to the VSUP rail. You could use a TLIN1431 as the commander and responder and have them disconnect and reconnect they're pull ups and diodes.

    Currently, our LIN expert is out of office but I am going to run this idea by him. I am fairly certain this will work but there may be something I am missing.

    Best,

    Chris