--- /dev/null
+#!/usr/bin/python
+# Copyright 2011 by Bdale Garbee <bdale@gag.com>. GPLv2
+#
+# Program to emit PCB footprint for QFN32 package used by TI CC1120
+#
+
+# dimensions in mm from the TI cc1111f32.pdf datasheet
+PinWidth = 0.28
+PinResist = PinWidth + (2 * 0.07)
+PinHeight = (5.8 - 4.1) / 2
+PinSpacing = 0.50
+Overall = 5.80
+GndSquare = 3.70
+CoreSquare = 3.30 # resist gaps and paste spots over ground tab
+PinSquare = 4.10
+
+import sys
+
+# we're going to use the 1/100 of a mil fundamental unit form
+def mm2mils100( mm ):
+ return int( mm / 25.4 * 1000.0 * 100.0 + 0.5 )
+
+print '# author: Bdale Garbee'
+print '# email: bdale@gag.com'
+print '# dist-license: GPL 2'
+print '# use-license: unlimited'
+
+print 'Element[0x0 "QFN36" "" "" 0 0 0 0 0 100 0x0]'
+print "("
+
+# pad under the chip, must be grounded
+print ' Pad[',\
+ mm2mils100(0), \
+ mm2mils100(0), \
+ mm2mils100(0), \
+ mm2mils100(0), \
+ mm2mils100(GndSquare), \
+ 0, \
+ 0, \
+ '"pin33" "33" "square,nopaste"]'
+
+# vias in the ground pad under the chip
+for viarow in range (-1,2):
+ for viacol in range (-1,2):
+ print ' Pin[',\
+ mm2mils100(2 * viacol * CoreSquare / 5), \
+ mm2mils100(2 * viarow * CoreSquare / 5), \
+ 2800, \
+ 1000, \
+ 0, \
+ 1500, \
+ '"pin33" "33" 0x0002]'
+
+# break pad under chip into a grid to control the resist and paste masks
+for viarow in range (-2, 3):
+ for viacol in range (-2, 3):
+ if (viarow in (-2, 0, 2)) and (viacol in (-2, 0, 2)):
+ # copper sub-square with resist over vias
+ print ' Pad[',\
+ mm2mils100(viacol * CoreSquare / 5), \
+ mm2mils100(viarow * CoreSquare / 5), \
+ mm2mils100(viacol * CoreSquare / 5), \
+ mm2mils100(viarow * CoreSquare / 5), \
+ mm2mils100((CoreSquare)/5), \
+ 0, \
+ 0, \
+ '"pin37" "37" "square,nopaste"]'
+ else:
+ # copper sub-square without resist
+ print ' Pad[',\
+ mm2mils100(viacol * CoreSquare / 5), \
+ mm2mils100(viarow * CoreSquare / 5), \
+ mm2mils100(viacol * CoreSquare / 5), \
+ mm2mils100(viarow * CoreSquare / 5), \
+ mm2mils100((CoreSquare)/5), \
+ 0, \
+ mm2mils100((CoreSquare)/5), \
+ '"pin37" "37" "square,nopaste"]'
+ # copper spot to control paste mask generation
+ print ' Pad[',\
+ mm2mils100(viacol * CoreSquare / 5), \
+ mm2mils100(viarow * CoreSquare / 5), \
+ mm2mils100(viacol * CoreSquare / 5), \
+ mm2mils100(viarow * CoreSquare / 5), \
+ 1500, \
+ 0, \
+ mm2mils100((CoreSquare)/5), \
+ '"pin37" "37" "square"]'
+
+# pins
+for pin in range (1,9):
+ print ' Pad[',\
+ mm2mils100((-4.5 + pin) * PinSpacing), \
+ mm2mils100(-Overall/2 + PinWidth/2), \
+ mm2mils100((-4.5 + pin) * PinSpacing), \
+ mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
+ mm2mils100(PinWidth), \
+ mm2mils100(PinSpacing - PinWidth), \
+ mm2mils100(PinResist), \
+ '"pin%i"' % (25-pin), '"%i"' % (25-pin), '0x0000]'
+
+ print ' Pad[',\
+ mm2mils100((-4.5 + pin) * PinSpacing), \
+ mm2mils100(+Overall/2 - PinHeight + PinWidth/2), \
+ mm2mils100((-4.5 + pin) * PinSpacing), \
+ mm2mils100(+Overall/2 - PinWidth/2), \
+ mm2mils100(PinWidth), \
+ mm2mils100(PinSpacing - PinWidth), \
+ mm2mils100(PinResist), \
+ '"pin%i"' % pin, '"%i"' % pin, '0x0000]'
+
+ print ' Pad[',\
+ mm2mils100(Overall/2 - PinHeight + PinWidth/2), \
+ mm2mils100((-4.5 + pin) * PinSpacing), \
+ mm2mils100(Overall/2 - PinWidth/2), \
+ mm2mils100((-4.5 + pin) * PinSpacing), \
+ mm2mils100(PinWidth), \
+ mm2mils100(PinSpacing - PinWidth), \
+ mm2mils100(PinResist), \
+ '"pin%i"' % (17-pin), '"%i"' % (17-pin), '0x0000]'
+
+ print ' Pad[',\
+ mm2mils100(-Overall/2 + PinWidth/2), \
+ mm2mils100((-4.5 + pin) * PinSpacing), \
+ mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
+ mm2mils100((-4.5 + pin) * PinSpacing), \
+ mm2mils100(PinWidth), \
+ mm2mils100(PinSpacing - PinWidth), \
+ mm2mils100(PinResist), \
+ '"pin%i"' % (24+pin), '"%i"' % (24+pin), '0x0000]'
+
+print ' ElementArc[',\
+ mm2mils100(-2.6), \
+ mm2mils100(2.6), \
+ '500 500 0 360 1000 ]'
+print ")"