Add sym/cmp for USB 2.0 Type C

[dbrgn]

SUMMARY

For low-speed applications (i.e. USB 2.0), USB type C without the high speed pins can be used. This reduces the number of pins from 24 to 16, which results in a connector that's easier to solder.

The symbol is identical to the "USB Connector Type C" symbol, just with the SSRX/SSTX pins removed.

DATASHEETS / REFERENCES

Example products:

• CUI UJC-HP-3-SMT-TR: https://www.cuidevices.com/product/resource/ujc-hp-3-smt-tr.pdf
• GCT USB4085: https://gct.co/connector/usb4085

OPEN QUESTIONS / UNRESOLVED ISSUES

None

CHECKLIST

• [x] I have read and followed the library conventions¹.
• [x] For packages, I followed IPC7351C (see details in library conventions).
• [x] For modified elements, I bumped their version number².
• [ ] I already used the new library elements in a design and verified their correctness (optional).
• [x] I'm the copyright owner of the added content (i.e. the changes are made by myself, not copied/imported from somewhere else).
• [x] I agree to publish all my changes under the CC0 Public Domain License³, allowing everyone to use and modify the content without any restrictions.

¹ Library Conventions: https://docs.librepcb.org/#libraryconventions ² Minor version bump if only metadata was modified (e.g. "0.1" -> "0.1.1"), major version bump if functional changes were made (e.g. "0.1" -> "0.2") ³ CC0 Public Domain License: https://en.wikipedia.org/wiki/CC0

[dbrgn]

Uh, sorry, I linked the wrong device (had them both open at the same time). I meant this one:

UJ20-C-H-G-SMT-TR https://www.cuidevices.com/product/interconnect/connectors/usb-connectors/uj20-c-h-g-smt-tr

I'm not sure about marking GND/VBUS signals as required. For the normal USB-C connector we set them to optional since there might be use-cases where these pins are not needed (at least VBUS maybe for self-powered devices?). I have no strong opinion about that, feel free to either change or leave it as-is.

Ah, true. For the power-only variant, not connecting VBUS/GND doesn't make sense at all. But for USB 2.0, that could be possible.

I'll remove the "required" flags before merging.

[ubruhin]

I'll remove the "required" flags before merging.

Since this seems to be the only open issue, I quickly did that and rebased the branch :see_no_evil:

[dbrgn]

Thanks!