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Add footprint for TI TCAN4550

KiCad Bot requested to merge github/fork/HubertD/tcan4550 into master

Created by: HubertD

Proposing this lack of better knowledge or ideas, especially regarding the footprint name.

This is my attempt of a footprint for the TCAN4550 SPI CAN Controller. http://www.ti.com/lit/ds/symlink/tcan4550-q1.pdf Symbol PR: https://github.com/KiCad/kicad-symbols/pull/1566

The package is what TI calls a QFN-20(RGY) or R-PVQFN-N20 with custom Thermal Pad. Base package is described here: http://www.ti.com/lit/ml/mpqf116g/mpqf116g.pdf

What I did to create this footprint:

  1. Create a VQFN package with ipc_noLead_generator.py from current kicad-footprint-generator repo (will post settings in a seperate comment)
  2. Move/Resize pads 12, 13, 22, 23 so that they overlap with the EP
  3. Renumber pads to match datasheet, set pin number 21 for all structures belonging to the future EP
  4. Add another "Pad 21" to fill the gap between the outer exposed pads

tcan4550 footprint

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 footprint(s) you are contributing
  • An example screenshot image is very helpful
  • If there are matching symbol or 3D model pull requests, provide link(s) as appropriate
  • Check the output of the Travis automated check scripts - fix any errors as required
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