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Original question:

TUSB320: What are the differences between the following parts: TUSB320 TUSB320LI TUSB320HI TUSB320LAI & TUSB320HAI?

TUSB320HI: Not recommended for UFP/DRP?

Fred Huettig
Prodigy 10 points
Part Number: TUSB320HI
Other Parts Discussed in Thread: TUSB320HAI, TUSB320LAI

I've been using the TUSB320LAI parts for some time successfully, and would like to switch to TUSB320HAI for easier compatibility in my 1.8V environment.  However we can't buy the HAI parts now, only the HI.  I see on the device page for TUSB320HI it refers to the HAI and says "The TUSB320HI/LI is not recommended for DFP or DRP configurations."  We need to support DFP and DRP (as well as UFP), but what is the problem with this part and the other modes?  There's "not recommended" and there's "doesn't work," which is this?

In case it matters I am only working in GPIO mode, and need only the basic modes of UFP/DRP/DFP, nothing fancy just want to know when something is connected and how much power it can supply if it can. In DFP/DRP I only need to advertise in legacy power mode.

Thanks!

  • 0
    TI__Guru** 112530 points

    there is a bug in TUSB320HI/LI that is fixed in TUSB320HAI/LAI..

    Regards

    Brian

  • 0 in reply to Brian Zhou
    Prodigy 10 points

    Thanks Brian, that's what I assumed.  But I'd like to know if this bug will affect our system, since we don't seem to have a choice right now.  Can anyone tell me what this bug is or how it manifests?  It must have been subtle enough that the non-A parts were produced, but serious enough that it warranted a new part number.

  • +1 in reply to Fred Huettig
    TI__Guru** 112530 points

    if a PD UFP device is plugged in then the TUSB320HI/LI could indicate a false disconnect.

    regards

    Brian

  • 0 in reply to Brian Zhou
    Prodigy 10 points

    Ah, that sounds very promising.  The only UFP devices that will be plugged in to our system are thumb drives and an ethernet adapter, neither of which I would expect to support PD AFAIK.  I want to make sure I'm hearing you correctly that these errors would occur when the TUSB side is DFP (or DRP acting as DFP) and we are connected to a UFP that is attempting PD.  In that case, and if that's the only issue, I think we may be in good shape.

    Thanks again,

      Fred

  • 0 in reply to Fred Huettig
    TI__Guru** 112530 points

    That is what system guy told me. suggest to order some samples to try first.

    Regards

    Brian

  • 0 in reply to Brian Zhou
    Prodigy 10 points

    Indeed, I ordered parts to try before even starting this thread, they will arrive tomorrow.  I just wanted to get a deeper understanding of the issue and make sure I'm not wasting my time by using a part not recommended for my application.  Would not be good if the problem was "it works fine for the first six months and then a threshold shift causes it to stop working and catch fire."  I appreciate your time on this.