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SN65HVD30: single ended SSI

Dennis Cascio
Prodigy 90 points
Part Number: SN65HVD30

We have used the SN65HVD30 for a differential, 6 wire, SSI interface before.  We now have an application that requires a single ended, 4 wire, SSI interface.  Is there a recommended connection configuration for the outputs to make them single ended?  Should the 'B' and 'Z' output just tie together as the common?

  • 0
    TI__Mastermind 20820 points
    Hi Dennis,

    I am looking into this for you and apologize for not having time to get to it today during normal business hours. i will follow up tomorrow with a response.
  • 0
    TI__Mastermind 20820 points

    Hi Dennis,

    Sorry for the delay on this, I had a water heater blow up in my attic last week which made quite a mess for me to deal with.

    What you could do to have the SN65HVD30 to support your single ended SSI interface would be to tie the receiver input B to a common voltage like 2V and then have A switch around it. This would be analogous to a comparator. I set this up in the lab and took a screen shot to show you it working:

    Here channel 1 is the receiver output (R) on the MCU side, channel 2 is the A pin on the bus side and channel 3 is the B pin on the bus side tied to a 2V source.

    For the driver things are not as complicated as above. Simply drive your signal to transmit into the driver input and send the signal A to the receiving SN65HVD30 at the other end. Here is a screenshot of this working:

    For both of these tests there was no termination installed on the bus. If you have going to set the 2V common signal on B from a PS on your board be sure to use resistors of high value (i.e. 50k ohms) so to limit the amount of power you are burning. Please let me know what other questions you have?