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Add Dialog GreenPAK STQFN-20 (4x6 pins)

R requested to merge ArcaneNibble/kicad-footprints:master into master

Summary:

Add one of the "STQFN-20" footprints for Dialog Semiconductor (formerly Silego Technology) GreenPAK devices (used for SLG4658x and SLG4682x parts).

Confusingly, there are several different incompatible variations of "STQFN-20" used for GreenPAK parts, and every one of them has a body that is 2 mm x 3 mm in size. Sorting by the "Socket" column on the parametric part selector shows 5 different test/programming sockets with the name "STQFN-20". The footprint in this PR corresponds to the ones labeled "3" and "4". The distinguishing feature of this footprint is that it has 4 pins on the top/bottom and 6 pins on the left/right (as opposed to "1" and "2" which have 3 pins on the top/bottom and 7 pins on the left/right or "5" which has two additional exposed pads). The footprints for parts using test socket "3" and "4" are identical (but the test sockets themselves are not identical. The "3" test socket contains additional capacitors and pin headers used with the LDO function).

This footprint is designed according to datasheet recommendations. It has been validated on a physical PCB at least once (hand assembly using a hot air rework tool). This footprint has not been tested under automated assembly.

Datasheets:

Screenshot:

gpk-stqfn20

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