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Add Abracon ABx8x5 RTCs

evanshultz requested to merge github/fork/evanshultz/abracon-abx8x5 into master

Designed to have interchangeable symbols.

https://abracon.com/Precisiontiming/AB08X5-RTC.PDF image image

https://abracon.com/Precisiontiming/AB18X5-RTC.pdf image image

The package drawings are identical and at https://abracon.com/Support/PackageDrawing/Precisiontiming/AB08XX.PDF and https://abracon.com/Support/PackageDrawing/Precisiontiming/AB18XX.PDF (no idea why they need to be separate...). I chose a nearly-compatible footprint submitted at https://github.com/KiCad/kicad-footprints/pull/1199. The lead width and length is slightly different, but our footprint names don't capture that info so how could we tell? In addition, the footprint used is a VQFN but the height of that part and these RTCs are all in the same range so no real difference to the 3D model.

All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

  • Provide a URL to a datasheet for the symbol(s) you are contributing
  • An example screenshot image is very helpful
  • Ensure that the associated footprints match the official footprint library
    • A new fitting footprint must be submitted if the library does not yet contain one.
  • If there are matching footprint PRs, provide link(s) as appropriate
  • Check the output of the Travis automated check scripts - fix any errors as required
  • Give a reason behind any intentional library convention rule violation.

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