Electronics > Beginners
USB connector design
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Karel:

--- Quote from: T3sl4co1l on April 27, 2018, 11:20:01 am ---Basically no appnote gets this.

So you end up with everyone using literally the flimsiest possible ground connection.  It's embarassing.

For 99% of what you're doing with USB:

GROUND THE SHELL!

Ground it hard, in multiple points, to the ground plane.  And obviously, use a ground plane, too!

Tim

--- End quote ---

I can confirm this. I burned myself once. Now I always connect the shell to the groundplane. No resistors, no capacitors, no ferrites.
T3sl4co1l:

--- Quote from: ataradov on April 27, 2018, 04:36:38 pm ---On the host side only. If you ground it on the device side, then the current will flow through the shield, eliminating any positive EMI effects it may have.
--- End quote ---

 :palm: :palm: :palm: :palm: :palm: :palm: :palm:

Dude, that's precisely what it's there to do!


--- Quote ---Also, it appears that there is really no consensus on this at all. And whatever opinion is expressed here by anyone can't be 100% true without a really good justification.
--- End quote ---

I haven't read a single book, since vacuum tubes were in vogue, that ever claimed open shields was a good thing.

Do you connect your cable TV without the shield?  Audio/video cables?  HDMI cables?

Do you connect your Ethernet with one wire in each pair floating?

Tim
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