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SN65HVD72: Are there any examples using RS485 transceivers with pulse transformers?

Shinichi Inoue
Guru 22436 points

Part Number: SN65HVD72

Dear Specialists, 

My customer would like to check if there is any example of SN65HVD72 communicating using the pulse transformer shown below.

I would be grateful if you could advise.

Are there any design example and adoption example?

---

CFA501
CFA102
JP101-202F1
JP101-402F1
JP101-502F1

https://jpc-inc.co.jp/wp-content/themes/jpc-inc/pdf/PT/3.pdf

https://jpc-inc.co.jp/wp-content/themes/jpc-inc/pdf/PT/7.pdf

---

I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Guru* 80531 points

    Hi Shinichi,

    I don't think we've ever used a pulse transformer on our RS485 lines since they have an inductance which affects the DC response and attenuates the signal during the idle periods. The standard itself does not mention the pulse transformer but we (TI) also don't ever recommend using a pulse transformer in application.

    -Bobby

  • 0 in reply to BOBBY
    Guru 22436 points

    Hi Bobby,

    Thank you for your reply.

    I found an example of using a pulse transformer for RS485.
    I think the customer is thinking about using it in this way.

    https://www.steptechnica.com/resources/pdf/product-guide/CUnet/STD_CUTGN_V1.2E.pdf

    This standard uses RS485 half-duplex transceivers, which TI products also have adopted.

    Did TI not actually support ?

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi

  • +1 in reply to Shinichi Inoue
    TI__Guru* 80531 points

    Shinichi,

    Our devices/RS485 does not mention use of pulse transformers. 

    It probably is possible to use pulse transformers on an RS485 line but we generally don't see it used often and we don't do any testing with our devices with pulse transformers. It is up to the customer to test their set up to verify if pulse transformers can be used in their application with our devices.

    -Bobby

  • 0 in reply to BOBBY
    Guru 22436 points

    Hi Bobby,

    Thank you for your reply.

    I understand.

    In this case,  it should be confirmed by the customer.

    I'll share with the customer.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi