[SI-LIST] Re: Question on USB 2.0
- From: doug@xxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx, Chundi Srikanth <chundis@xxxxxxxxx>
- Date: Fri, 02 Jan 2015 01:40:38 -0500
Hi Chundi,
Does this damage happen most of the time or only occasionally? An
important clue. How and where is the shield connected, another case
where physical implementation being very important.
The physical implementation of the protection is at least as important
as the electrical design so I would need board layout, stack-up, and
how the board interfaces the chassis, if any. Probably an NDA would be
required, if so this would become a job for pay as a few hours of work
would be needed.
Doug
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On Fri, 2 Jan 2015 11:40:21 +0530, Chundi Srikanth <chundis@xxxxxxxxx> wrote:
Dear techies,
> I have a question on USb 2.0. We have one of our custom SoC having USB
> Transceiver functionality and the signals are routing from SoC to external
> connector with protection circuit shown in the attached.
>
> We have a requirement of Hot plugging the connector. In doing this process
> we found that our USB port is getting damaged and even the port is not
> detectable. I am attaching our protection circuit for your reference. Could
> you let me know what might be causing this issue and how to rectify this? I
> am suspecting that while hot plugging the high inrush current might be
> damaging the port.
>
> Any terminations needed on the bus for USb 2.0?
>
> Just share your thoughts on this.
>
> Thank You
>
> regards
> Srikanth
>
>
>
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