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Added TQFP-52 with exposed pad footprint for AD6645

Paweł Grudziński requested to merge github/fork/pgrudzinski/tqfp-52 into master

TQFP-52 footprints generated by script with following package parameters:

TQFP-52-1EP_10x10mm_P0.65mm_EP6.5x6.5mm:
  device_type: 'TQFP'
  size_source: 'http://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/tqfp_edsv/sv_52_1.pdf'
  body_size_x:
    nominal: 10
    tolerance: 0
  body_size_y:
    nominal: 10
    tolerance: 0
  overall_size_x:
    nominal: 12
    tolerance: 0
  overall_size_y:
    nominal: 12
    tolerance: 0
  lead_width_min: 0.22
  lead_width_max: 0.38
  lead_len_min: 0.45
  lead_len_max: 0.75
  pitch: 0.65
  num_pins_x: 13
  num_pins_y: 13

  EP_size_x:
    minimum: 6.4
    nominal: 6.5
    maximum: 6.6
  EP_size_y:
    minimum: 6.4
    nominal: 6.5
    maximum: 6.6
  EP_paste_coverage: 0.65
  EP_num_paste_pads: [5, 5]
  #heel_reduction: 0.1 #for relatively large EP pads (increase clearance)
  # EP_size_limit_x: 3.6  #for relatively large EP pads (increase clearance)
  # EP_size_limit_y: 3.6  #for relatively large EP pads (increase clearance)

  thermal_vias:
    count: [4, 4]
    drill: 0.2
    # min_annular_ring: 0.15
    paste_via_clearance: 0.1
    # EP_num_paste_pads: [2, 2]
    #paste_between_vias: 1
    #paste_rings_outside: 1
    #EP_paste_coverage: 0.65
    #grid: [1, 1]
    # bottom_pad_size:
    # paste_avoid_via: True

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