• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 509 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

RS-485 Transceivers with Integrated Isolator

Lakshminarayana
Genius 3790 points
Other Parts Discussed in Thread: SN6501, ISO1412, ISOW7841, THVD1500

Hi,

As I was suggested SN65HVD7x series RS-485 Transceivers for the Full-Duplex, I would like to know the working of integrated Enable pins as well as Does TI offers any Integrated Isolators with RS-485 Transceivers?

Looking at the SN65HVD7x series RS-485 Transceivers it can be seen that it supports either Driver and Receiver enable OR Without those enable(Integrated).

Which one do you suggest to go with?

Could you please elaborate on the Integrated Enable use case? (Less pin count?) as well in case of integrated Enable on Driver will be always pulled to high and receiver enable is pulled low ? .

Are there any Integrated Isolators Transceivers like ADM2582E (Full-Duplex).

Also may I know the use of Level shifter(SN74LV1T34DBVR) with Transceivers as in the reference design of 

 

Thank you.

  • 0
    TI__Expert 6955 points

    Lakshminarayana,

    The ISO1412 is one of our newest isolated full duplex RS-485 transceivers. However, it does not have integrated isolated power like the ADM2582E. You will need to provide isolated DC externally. We also have the SN6505 and SN6501 transformer drivers that achieve this separately. 

    If you need integrated power and isolation at the same time, the ISOW7841 is a digital isolator with integrated isolated power. You can pair this with a non-isolated RS-485 transceiver, like the SN65HVD7x, to achieve isolated RS-485 and isolated DC power. I recommend reading this blog to see examples of this in diagrams.

    There are sections in the datasheets of RS-485 transceivers that explain the enable logic of the transceivers. Tables 2 and 3 in the ISO1412 datasheet contain this information. Are you seeking to control the enables with only one input?

    The user guide of the TIDM-1005 that you are referring to explains the purpose of the level shifter. See below.

    "The level shifter (SN74LV1T34DBVR) installed between the ISOW7841 and MSP432P401R adjusts the voltage level in the control (GPIO) and data (UART) paths between the MSP432 and THVD1500 to deliver the proper logical value to each device."

    Respectfully,

    Lucas

  • 0 in reply to Lucas Schulte9
    TI__Expert 6955 points

    Lakshminarayana,

    I haven't heard from you. I hope I was able to answer your questions. If so, please mark my answer as resolved.

    Respectfully,

    Lucas Schulte