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Add ATSAMC2xE and ATSAMC2xG series MCUs

KiCad Bot requested to merge github/fork/EvilMav/atsamc20e into master

Created by: EvilMav

Added MCU_Microchip_SAMC.lib with ATSAMC2xG (48-pin) and E (32-pin) microcontrollers. Both have C20 and C21 versions, multiple memory sizes and TQFP (-AU) as well as QFN (-MU) packages, which results in a zillion aliases. I did NOT add the -AN/-MN aliases (high temperature versions) as I'm not sure which are available off-the shelf and I did NOT add the -AUT aliases as those are same chips in different tapes.

For the QFN versions I've put the thermal pad on GND - the datasheet does not say anything about the pad, probably not connected, but according to forum topics it seems not wrong...

Datasheet: https://www.microchip.com/mymicrochip/filehandler.aspx?ddocname=en598829

kicad_screenshot_tmp_samc-e kicad_screenshot_tmp_samc-e-qfnfoot kicad_screenshot_tmp_samc-e-tqfpfoot kicad_screenshot_tmp_samc-g kicad_screenshot_tmp_samc-g-qfnfoot kicad_screenshot_tmp_samc-g-tqfpfoot

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