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THVD8000: Can it support multiple typologies like star, ring and bus topology?

AnBer
Mastermind 29340 points
Part Number: THVD8000
Other Parts Discussed in Thread: TINA-TI

Team,

In order to replace an existing custom technology the THVD8000 need to support different typologies ( star, ring and bus).
SLLA496 section 6 suggests that different typologies can be supported.

-Do you have any comments/design advises/experience for supporting all the three star, ring and bus typologies?
Any specific limitation for specific typologies that you can think of?
Any evidence that can convince that THVD8000 can be used for all three?

-Do we have some tools/models in order to simulate different typologies under different condition (typologies, cable type, cable length, ..etc) to assess the feasibility?
  I remember for example that we did provide some TINA-TI/SPICE simulation file as part of the TIDA-010035.
  we did as well provide https://www.ti.com/tool/TIDA-00527 Anything plan to make the technology assessment a bit more easy?


Thanks in advance,

A.

  • 0
    TI__Mastermind 25705 points

    A.,

    THVD8000 leverages RS485's signaling. Therefore we can refer RS485 application tips in many aspects. These transceivers prefer daisy chain because one main bus can be terminated properly to reduce the reflection. It's OK to choose other topologies provided the signal has enough time to settle down in one bit. In other words the data rate is slow and distance is short. Here is an example of lab measurement, which shows the difference on the bus waveform with and without termination.

    In the plot, the green is the transmitted signal and the blue is the received one. The left one shows several small ringing due to open end (with no termination), while the right one is cleaner (with termination). If the ringing is a small percent of the bit time, it won't impact communication. Otherwise the duty cycle might shift.

    Unfortunately there is no easy way to decide if the topology would work. THVD8000's model is still in development. What I can recommend is either using EVMs to set it up in the lab or following the practice of TIDA-010035

    Regards,

    Hao