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SPI(CLK/SDO/SDI) buffer (driver) to support long cable(85cm)

Jung-Ho Seo
Expert 6105 points

Other Parts Discussed in Thread: SN65LVDT41, SN65LVDT14

Dear experts,

Customer is looking for SPI driver to support long cable(85cm). cable is harness cable.

Can you recommend proper part to support this ? 

Any device is okay if function is okay..

Thanks,

JH.

  • 0
    TI__Guru 74662 points
    Jung-Ho,

    It sounds like you need a buffer. What is the data rate needed for this application? Depending o nthe speed, an RS-485 transceiver for each SPI line could work. This would turn the single-ended signal into a differential signal that would go down the harness cable, and then into another transceiver where it would be single-ended again. We also have some LVDS parts that could work.

    Regards,
  • 0 in reply to Eric Hackett
    TI__Expert 6105 points

    Hi Eric,

    Sorry for not giving information..

    Datarate : 10~20Mhz

    IO level : 3.3V

    Would you recommend proper part  ?

    Thanks,

    JH.

  • 0 in reply to Jung-Ho Seo
    TI__Guru 74662 points

    Jung-Ho,

    Thank you for the information. It looks like the SN65LVDT14 and the SN65LVDT41 devices will work for this application. These devices can be used together to send and receive all SPI signals across a cable. The SN65LVDT14 has 4 RX and 1 TX, and the SN65LVDT41 has 4 TX and 1 RX, so they can handle all the SPI signals in one package, and can support up to 125Mbps speeds. 

    Let me know if these devices will work for you.

    Regards,

  • 0 in reply to Eric Hackett
    TI__Expert 6105 points

    Hi Eric,

    Thanks for kind and quick tech support.

    I will recommend SN65LVDT14/41 to customer.

    Once I get any question from customer, I will also ask for your help.

    Very thanks for your support again.

    Thanks,

    JH.