Add Package_DFN_QFN.3dshapes/WQFN-20-1EP_2.5x4.5mm_P0.5mm_EP1x2.9mm

[whitequark]

Generated in the same way as other models in that library. Matches footprint from KiCad/kicad-footprints#477.

Parameters:

'WQFN-20-1EP_2.5x4.5mm_P0.5mm_EP1x2.9mm': Params( # from http://www.onsemi.com/pub/Collateral/505AB.PDF
    c = 0.2,        # pin thickness, body center part height
#    K=0.2,          # Fillet radius for pin edges
    L = 0.4,        # pin top flat part length (including fillet radius)
    fp_s = True,     # True for circular pinmark, False for square pinmark (useful for diodes)
    fp_r = 0.5,     # first pin indicator radius
    fp_d = 0.1,     # first pin indicator distance from edge
    fp_z = 0.01,     # first pin indicator depth
    ef = 0.0,       # fillet of edges  Note: bigger bytes model with fillet
    cce = 0.25,      # chamfer of the epad 1st pin corner
    D = 4.5,       # body overall length
    E = 2.5,       # body overall width
    A1 = 0.02,  # body-board separation  maui to check
    A2 = 0.78,  # body height
    b = 0.24,  # pin width
    e = 0.5,  # pin (center-to-center) distance
    m = 0.0,  # margin between pins and body
    ps = 'rounded',   # rounded pads
    npx = 8,  # number of pins along X axis (width)
    npy = 2,  # number of pins along y axis (length)
    epad = (2.9,1.0), # e Pad
    excluded_pins = None, #no pin excluded
    modelName = 'WQFN-20-1EP_2.5x4.5mm_P0.5mm_EP1x2.9mm', #modelName
    rotation = -90, # rotation if required
    dest_dir_prefix = '../Housings_DFN_QFN.3dshapes/'
    ),

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• A screenshot of the model(s) aligned with KiCad footprints is very useful
• Source files (or scripts) have been contributed
• Step model submitted in 1:1 scale
• WRL model submitted in 1:2.54 scale
• 3D model alignment checked against KiCad footprint
• WRL model uses correct material properties
• Geometry check performed against mechanical models

[CLAassistant]

All committers have signed the CLA.

[whitequark]

@evanshultz can you please review?

[Shackmeister]

looks good :) thanks for your contribution please make sure to add the parameters to the generator repository