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TLIN1029-Q1: USB-LIN vsup

Marcio Barbiani
Prodigy 20 points
Part Number: TLIN1029-Q1

Hello everybody,

I am developing an usb-lin cable and I need to choose how to power the chip. Rectify the lin bus or use 5 volts from the usb port?

Thank you.

  • 0
    TI__Guru 62920 points

    Hi Marcio,

    The TLIN1029 device will operate down to VSUP = 4 V, so you could power it via USB if you wanted.  However, most LIN interfaces are referenced to an automotive battery voltage (e.g., 12 V).  If your cable is going to connect to such a system, you might want to include an additional connection to the battery voltage so that the LIN signal amplitude will scale accordingly and remain compatible with the other nodes on the bus.

    Please let me know if this doesn't make sense or if you have further questions.

    Regards,
    Max

  • 0 in reply to Miguel Robertson
    Prodigy 20 points

    Hello Max,

    I do not plan to connect it to automotive buses.

    It will be like a two wire half-duplex interface for debugging and firmware updating.

    When I posted the question I had one node powered/pulled up from 12v and was going to make the second tlin1029 (and to USB port) powered from the bus.

    Since I am designing the two end points I guess I can reference both to 5 volts.

    Thank you for the advice.