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Scripted replacement for qfn-20 (ATTiny MCUs)

Rene Poeschl requested to merge github/fork/poeschlr/scripted_fp_attiny_qfn-20 into master

The EP of the current footprint is wrong. So the old one is deleted and a new one with the correct dimensions added.

Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/doc2535.pdf https://github.com/pointhi/kicad-footprint-generator/pull/250

screenshot from 2018-12-23 21-01-57

QFN-20-1EP_4x4mm_P0.5mm_EP2.6x2.6mm:
  device_type: 'QFN'
  size_source: 'http://ww1.microchip.com/downloads/en/DeviceDoc/doc2535.pdf#page=164'
  ipc_class: 'qfn' # 'qfn_pull_back'
  body_size_x:
    nominal: 4
    tolerance: 0
  body_size_y:
    nominal: 4
    tolerance: 0
  body_height:
    minimum: 0.7
    nominal: 0.75
    maximum: 0.8

  lead_width:
    minimum: 0.18
    nominal: 0.23
    maximum: 0.30
  lead_len:
    minimum: 0.35
    nominal: 0.4
    maximum: 0.55

  EP_size_x:
    minimum: 2.45
    nominal: 2.6
    maximum: 2.75
  EP_size_y:
    minimum: 2.45
    nominal: 2.6
    maximum: 2.75
  EP_num_paste_pads: [2, 2]


  thermal_vias:
    count: [2, 2]
    drill: 0.2
    paste_via_clearance: 0.1
    paste_between_vias: 2
    EP_paste_coverage: 0.75
    paste_avoid_via: False

  pitch: 0.5
  num_pins_x: 5
  num_pins_y: 5

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