# 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 import pcbnew import FootprintWizardBase import PadArray as PA class QFNWizard(FootprintWizardBase.FootprintWizard): def GetName(self): return "QFN" def GetDescription(self): return "Quad Flat No-lead (QFN) footprint wizard" def GenerateParameterList(self): #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, 0.5, designator='e') self.AddParam("Pads", "width", self.uMM, 0.25, designator='X1') self.AddParam("Pads", "length", self.uMM, 1.5, designator='Y1') self.AddParam("Pads", "fillet", self.uMM, 0.3) self.AddParam("Pads", "oval", self.uBool, True) 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, 2, min_value=1) self.AddParam("EPad", "y divisions", self.uInteger, 2, min_value=1) self.AddParam("EPad", "paste margin", self.uMM, 0.1) 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): pass def GetValue(self): 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): pad_pitch = self.pads["pitch"] pad_length = self.pads["length"] # Fillet allows to define how much of the pad is outside of the package pad_fillet = self.pads["fillet"] pad_width = self.pads["width"] v_pitch = self.package["height"] h_pitch = self.package["width"] pads_per_row = int(self.pads["n"] // 4) row_len = (pads_per_row - 1) * pad_pitch 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_fillet, pad_width, shape=pad_shape, rot_degree=90.0) v_pad = PA.PadMaker(self.module).SMDPad( pad_length + pad_fillet, pad_width, shape=pad_shape) h_pitch = h_pitch / 2 - pad_length + (pad_length+pad_fillet)/2 v_pitch = v_pitch / 2 - pad_length + (pad_length+pad_fillet)/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) lim_x = self.package["width"] / 2 lim_y = self.package["height"] / 2 inner = (row_len / 2) + pad_pitch # epad 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) 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) offset = self.draw.GetLineThickness() clip = row_len / 2 + self.pads['pitch'] 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) # Courtyard cmargin = self.package["margin"] self.draw.SetLayer(pcbnew.F_CrtYd) 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 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 = v_pitch / 2 + text_size + pad_length / 2 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()