kicad/pcbnew/python/plugins/qfn_wizard.py

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# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
from __future__ import division
import pcbnew
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import pcbnew
import FootprintWizardBase
import PadArray as PA
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class QFNWizard(FootprintWizardBase.FootprintWizard):
def GetName(self):
return "QFN"
def GetDescription(self):
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return "Quad Flat No-lead (QFN) footprint wizard"
def GenerateParameterList(self):
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#TODO - Allow different number of pads in x and y directions
self.AddParam("Pads", "n", self.uInteger, 100, multiple=4, min_value=4)
self.AddParam("Pads", "pitch", self.uMM, 0.4, designator='e')
self.AddParam("Pads", "width", self.uMM, 0.2, designator='X1')
self.AddParam("Pads", "length", self.uMM, 0.75, designator='Y1')
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self.AddParam("Pads", "offset", self.uMM, 0.0)
self.AddParam("Pads", "oval", self.uBool, True)
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self.AddParam("EPad", "epad", self.uBool, True)
self.AddParam("EPad", "width", self.uMM, 10, designator="E2")
self.AddParam("EPad", "length", self.uMM, 10, designator="D2")
self.AddParam("EPad", "thermal vias", self.uBool, False)
self.AddParam("EPad", "thermal vias drill", self.uMM, 1, min_value=0.1)
self.AddParam("EPad", "x divisions", self.uInteger, 4, min_value=1)
self.AddParam("EPad", "y divisions", self.uInteger, 4, min_value=1)
self.AddParam("EPad", "paste margin", self.uMM, 0.75)
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self.AddParam("Package", "width", self.uMM, 14, designator='E')
self.AddParam("Package", "height", self.uMM, 14, designator='D')
self.AddParam("Package", "margin", self.uMM, 0.25, minValue=0.2)
@property
def pads(self):
return self.parameters['Pads']
@property
def epad(self):
return self.parameters['EPad']
@property
def package(self):
return self.parameters['Package']
def CheckParameters(self):
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pass
def GetValue(self):
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return "QFN-{n}_{ep}{x:g}x{y:g}_Pitch{p:g}mm".format(
n = self.pads['n'],
ep = "EP_" if self.epad['epad'] else '',
x = pcbnew.ToMM(self.package['width']),
y = pcbnew.ToMM(self.package['height']),
p = pcbnew.ToMM(self.pads['pitch'])
)
def BuildThisFootprint(self):
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pad_pitch = self.pads["pitch"]
pad_length = self.pads["length"]
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# offset allows to define how much of the pad is outside of the package
pad_offset = self.pads["offset"]
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pad_width = self.pads["width"]
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v_pitch = self.package["height"]
h_pitch = self.package["width"]
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pads_per_row = int(self.pads["n"] // 4)
row_len = (pads_per_row - 1) * pad_pitch
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pad_shape = pcbnew.PAD_SHAPE_OVAL if self.pads["oval"] else pcbnew.PAD_SHAPE_RECT
h_pad = PA.PadMaker(self.module).SMDPad( pad_length, pad_width,
shape=pad_shape, rot_degree=90.0)
v_pad = PA.PadMaker(self.module).SMDPad( pad_length, pad_width, shape=pad_shape)
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h_pitch = h_pitch / 2 - pad_length + pad_offset + pad_length/2
v_pitch = v_pitch / 2 - pad_length +pad_offset + pad_length/2
#left row
pin1Pos = pcbnew.wxPoint(-h_pitch, 0)
array = PA.PadLineArray(h_pad, pads_per_row, pad_pitch, True, pin1Pos)
array.SetFirstPadInArray(1)
array.AddPadsToModule(self.draw)
#bottom row
pin1Pos = pcbnew.wxPoint(0, v_pitch)
array = PA.PadLineArray(v_pad, pads_per_row, pad_pitch, False, pin1Pos)
array.SetFirstPadInArray(pads_per_row + 1)
array.AddPadsToModule(self.draw)
#right row
pin1Pos = pcbnew.wxPoint(h_pitch, 0)
array = PA.PadLineArray(h_pad, pads_per_row, -pad_pitch, True,
pin1Pos)
array.SetFirstPadInArray(2*pads_per_row + 1)
array.AddPadsToModule(self.draw)
#top row
pin1Pos = pcbnew.wxPoint(0, -v_pitch)
array = PA.PadLineArray(v_pad, pads_per_row, -pad_pitch, False,
pin1Pos)
array.SetFirstPadInArray(3*pads_per_row + 1)
array.AddPadsToModule(self.draw)
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lim_x = self.package["width"] / 2
lim_y = self.package["height"] / 2
inner = (row_len / 2) + pad_pitch
# epad
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epad_width = self.epad["width"]
epad_length = self.epad["length"]
epad_ny = self.epad["x divisions"]
epad_nx = self.epad["y divisions"]
epad_via_drill = self.epad["thermal vias drill"]
# Create a central exposed pad?
if self.epad['epad'] == True:
epad_num = self.pads['n'] + 1
epad_w = epad_length / epad_nx
epad_l = epad_width / epad_ny
# Create the epad
epad = PA.PadMaker(self.module).SMDPad( epad_w, epad_l, shape=pcbnew.PAD_SHAPE_RECT )
epad.SetLocalSolderPasteMargin( -1 * self.epad['paste margin'] )
# set pad layers
layers = pcbnew.LSET(pcbnew.F_Mask)
layers.AddLayer(pcbnew.F_Cu)
layers.AddLayer(pcbnew.F_Paste)
epad.SetName(epad_num)
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array = PA.EPADGridArray( epad, epad_ny, epad_nx, epad_l, epad_w, pcbnew.wxPoint(0,0) )
array.SetFirstPadInArray(epad_num)
array.AddPadsToModule(self.draw)
if self.epad['thermal vias']:
# create the thermal via
via_diam = min(epad_w, epad_l) / 2
via_drill = min(via_diam / 2, epad_via_drill)
via = PA.PadMaker(self.module).THRoundPad(via_diam, via_drill)
layers = pcbnew.LSET.AllCuMask()
layers.AddLayer(pcbnew.B_Mask)
layers.AddLayer(pcbnew.F_Mask)
via.SetLayerSet(layers)
via_array = PA.EPADGridArray(via, epad_ny, epad_nx, epad_l, epad_w, pcbnew.wxPoint(0,0) )
via_array.SetFirstPadInArray(epad_num)
via_array.AddPadsToModule(self.draw)
# Draw the package outline on the F.Fab layer
bevel = min( pcbnew.FromMM(1.0), self.package['width']/2, self.package['height']/2 )
self.draw.SetLayer(pcbnew.F_Fab)
w = self.package['width']
h = self.package['height']
self.draw.BoxWithDiagonalAtCorner(0, 0, w, h, bevel)
# Silkscreen
self.draw.SetLayer( pcbnew.F_SilkS )
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offset = self.draw.GetLineThickness()
clip = row_len / 2 + self.pads['pitch']
self.draw.SetLineThickness( pcbnew.FromMM( 0.12 ) ) #Default per KLC F5.1 as of 12/2018
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self.draw.Polyline( [ [ clip, -h/2-offset], [ w/2+offset,-h/2-offset], [ w/2+offset, -clip] ] ) # top right
self.draw.Polyline( [ [ clip, h/2+offset], [ w/2+offset, h/2+offset], [ w/2+offset, clip] ] ) # bottom right
self.draw.Polyline( [ [-clip, h/2+offset], [-w/2-offset, h/2+offset], [-w/2-offset, clip] ] ) # bottom left
# Add pin-1 indication as per IPC-7351C
self.draw.Line( -clip, -h/2-offset, -w/2-pad_length/2, -h/2-offset )
self.draw.SetLineThickness( offset ) #Restore default
# Courtyard
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cmargin = self.package["margin"]
self.draw.SetLayer(pcbnew.F_CrtYd)
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sizex = (lim_x + cmargin) * 2 + pad_length
sizey = (lim_y + cmargin) * 2 + pad_length
# round size to nearest 0.1mm, rectangle will thus land on a 0.05mm grid
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sizex = pcbnew.PutOnGridMM(sizex, 0.1)
sizey = pcbnew.PutOnGridMM(sizey, 0.1)
# set courtyard line thickness to the one defined in KLC
thick = self.draw.GetLineThickness()
self.draw.SetLineThickness(pcbnew.FromMM(0.05))
self.draw.Box(0, 0, sizex, sizey)
# restore line thickness to previous value
self.draw.SetLineThickness(pcbnew.FromMM(thick))
#reference and value
text_size = self.GetTextSize() # IPC nominal
text_offset = sizey / 2 + text_size
self.draw.Value(0, text_offset, text_size)
self.draw.Reference(0, -text_offset, text_size)
# set SMD attribute
self.module.SetAttributes(pcbnew.MOD_CMS)
QFNWizard().register()