Addressable RGB LED 2020 - Worldsemi WS2812B-2020

@@ -44,13 +44,20 @@ part the polarity mark is the dark stripe on the underside beside the pin 1/2 co  ## 3D model provenance -No manufacturer or KiCad 3D model exists for this package (Worldsemi publishes datasheets only; KiCad's-`LED_WS2812B-2020_PLCC4_2.0x2.0mm` footprint names a STEP that is not in its 3D library), so the STEP is-**AI-generated** from the datasheet dimensions with OpenCascade: body 2.20 x 2.00 mm, height 0.84 mm with a-0.28 mm substrate (p.1, p.2), clear moulding 1.45 mm wide (p.1), castellated terminals at 1.00 mm pitch (p.1),-underside polarity stripe beside pins 1/2 (p.1). The R/G/B die patches follow the p.1 top-view sketch (a row-beside the control IC; undimensioned, so their size and position are illustrative); colours from the p.3-dominant wavelengths, desaturated. Details and scripts: `provenance/`.+Worldsemi publishes no 3D model for this package and KiCad's 3D library has none, so the STEP is+**AI-generated** from the Worldsemi WS2812B-2020 datasheet with OpenCascade. Printed dimensions are used as+printed: body 2.20 x 2.00 mm, height 0.84 mm with a 0.28 mm substrate, clear moulding 1.45 mm wide over the+full 2.00 mm, terminals at 1.00 mm pitch, 1.13 mm between the bottom pads. Undimensioned features were+measured off the Mechanical Dimensions drawings at 350 px/mm against the printed edges: bottom pads+0.535 x 0.78 mm, castellation radius 0.20 mm, the four top-side terminal shapes (traced from the Top View),+the underside polarity stripe beside pins 1/2, and the IC and R/G/B die positions (illustrative, the sketch+is undimensioned). Overlaid on the datasheet drawings at the same scale, the model matches the Back View and+Top View.++The part number is marked in dark grey on the clear moulding's front wall (pins 2/3 side), so the window+over the dies stays clear; a light mark would not read on the white housing. The real part carries no+printed marking. `WS2812B-2020-uncoloured.step` is the same package without the die patches and without+the mark. Builder and traced shapes: `provenance/tools/`.  ## Footprint