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TLIN1028-Q1: Design review

Jeffrey Chung1
Genius 3310 points
Part Number: TLIN1028-Q1

Hi TI Team,

I'd like to request the TLIN10285DRQ1 design review for replacement of MELEXIS LIN transceiver. My customer is trying to replace LIN transceiver from MELEXIS to TI, and they want to know if the attached schematic can be used without major change. Are there any points that need to change or delete in attached schematic?

LIN Transceiver_TLIN10285DRQ1.pdf

Regards,

Jeffrey

  • +1
    TI__Guru 74282 points

    Jeffrey,

    The schematic looks good, but since RXD on the the TLIN1028x-Q1 device is open-drain, a pull-up resistor will need to be added so the logic high signal can be seen. Otherwise, RXD will just stay low indefinitely.

    Every other pin looks good:

    • VSUP and VCC both have the correct amount of capacitance for full functionality and stability.
    • Is this SBC being used in the responder configuration? I assume yes but I want to make sure a 1k pull-up on the LIN isn't needed. How much capacitance is C48? I'm not able to find that capacitor online when I search the part number.
    • The note for nRST says active high, this pin is actually active low. Also it doesn't need a pull-up to 5V, but leaving this pull-up won't hurt anything.
    • TXD and EN are both correct.

    Please let me know if there are any other questions.

    Regards,

    Eric Hackett 

  • 0 in reply to Eric Hackett
    Genius 3310 points

    Hi Eric,

    This SBC is being used in the responder node, so a 1k pull-up isn't needed, you're right. And NOUSE of C48 means not used or not inserted.

    According to EVM circuit, R3(51ohm) is used on TXD. Is it necessary point or not for staying low?

    Regards,

    Jeffrey

  • 0 in reply to Jeffrey Chung1
    TI__Guru 74282 points

    Jeffrey,

    Thanks for the clarification.

    No, R3 is there in case the function generator being used to test needs a 50 ohm termination to get the full signal to TXD. It is not needed in an actual application.

    Regards,

    Eric Hackett