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ISO1432: ISO1432 for isolated SPI interface

KPA
Prodigy 220 points
Part Number: ISO1432
Other Parts Discussed in Thread: ISO6741

Hi,

Can ISO1432 be used for isolated SPI interface?

I mean if I want to transmit MOSI and receive MISO signal using ISO1432 (as isolator+differential transceiver).

Is it feasible to use ISO1432 like that?

  • 0
    TI__Guru 55835 points

    Hi Krunal,

    Yes, this is possible. ISO1432 is only a transceiver that works like a voltage level translator by converting TTL/CMOS logic levels to RS-485 compatible differential signals and vice-versa. Since the device is only a transceiver and doesn't involve any protocol, most protocols can be implemented at MCU level connected through differential electrical interface.

    Many customers use differential line drivers / RS-485 transceivers for long range SPI communication and they have been able to do so without any issues. Hence, you should not have any issues in using ISO1432 for SPI communication as well. Thanks.

    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Prodigy 220 points

    HI Koteshwar,

    Thank you very much for your reply.

  • 0 in reply to KPA
    TI__Guru 55835 points

    Hi Krunal,

    I would also like to add that if the two SPI nodes that you are trying to interface are on the same board or are on two different boards that are very close by, then you can use a digital isolator like ISO6741 to isolate SPI interface. If the SPI nodes are pretty far then using isolated differential line driver or isolated RS-485 transceiver. Thanks.

    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Prodigy 220 points

    Hi,

    Glad to hear from you.

    Basically, I am framing a design for PLC modules with back-plane interface having SPI and/or I2C bus for intra-module communication.

    The information provided by you will be helpful to me.

    Also open to further suggestions.

    Regards

  • 0 in reply to KPA
    TI__Guru 55835 points

    Hi Krunal,

    I understand your requirement better now. For back-plane communication between modules in a PLC, RS-485 or LVDS communications are best suited and are commonly used. Using SPI over RS-485 bus will be equally the same and hence, shouldn't be an issue either. It should be fine to use either of the approaches, thanks.

    Regards,
    Koteshwar Rao