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Possibly redundant resistors on the USB data lines #19

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szszszsz opened this issue Apr 14, 2020 · 0 comments
Open

Possibly redundant resistors on the USB data lines #19

szszszsz opened this issue Apr 14, 2020 · 0 comments

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@szszszsz
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It is possible the 22 Ohm resistors on the USB data lines are redundant, due to misleading reference schematics. To investigate.

A report from one of the users received on Riot:

I am watching some videos about USB, one seems to tell that 22 r resistors on the USB data lines are not needed
https://youtu.be/vwlXUOY7KY0?t=269
They are on the Nitrokey_Pro_v2_schematics.pdf, and I think I saw them on other board designs
That seemed weird, but why not. Then I saw the video suggesting that a "reference" design included them without mentioning it was a workaround because an improper ESD part was used

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