2 # Copyright 2007 by Bdale Garbee <bdale@gag.com>. GPLv2
4 # Program to emit PCB footprint for QFN36 package used by TI CC1111
7 # dimensions in mm from the TI cc1111f32.pdf datasheet
9 PinResist = 0.381 # width of gap in solder resist over pad
14 CoreSquare = 3.7592 # resist gaps and paste spots over ground tab
19 # we're going to use the 1/100 of a mil fundamental unit form
21 return int( mm / 25.4 * 1000.0 * 100.0 + 0.5 )
23 print 'Element[0x0 "QFN36" "" "" 0 0 0 0 0 100 0x0]'
26 # pad under the chip, must be grounded
32 mm2mils100(GndSquare), \
35 '"pin37" "37" "square,nopaste"]'
37 # vias in the ground pad under the chip
38 for viarow in range (-1,2):
39 for viacol in range (-1,2):
41 mm2mils100(2 * viacol * CoreSquare / 5), \
42 mm2mils100(2 * viarow * CoreSquare / 5), \
47 '"pin37" "37" 0x0000]'
49 # break pad under chip into a grid to control the resist and paste masks
50 for viarow in range (-2, 3):
51 for viacol in range (-2, 3):
52 if (viarow in (-2, 0, 2)) and (viacol in (-2, 0, 2)):
53 # copper sub-square with resist over vias
55 mm2mils100(viacol * CoreSquare / 5), \
56 mm2mils100(viarow * CoreSquare / 5), \
57 mm2mils100(viacol * CoreSquare / 5), \
58 mm2mils100(viarow * CoreSquare / 5), \
59 mm2mils100((CoreSquare)/5), \
62 '"pin37" "37" "square,nopaste"]'
64 # copper sub-square without resist
66 mm2mils100(viacol * CoreSquare / 5), \
67 mm2mils100(viarow * CoreSquare / 5), \
68 mm2mils100(viacol * CoreSquare / 5), \
69 mm2mils100(viarow * CoreSquare / 5), \
70 mm2mils100((CoreSquare)/5), \
72 mm2mils100((CoreSquare)/5), \
73 '"pin37" "37" "square,nopaste"]'
74 # copper spot to control paste mask generation
76 mm2mils100(viacol * CoreSquare / 5), \
77 mm2mils100(viarow * CoreSquare / 5), \
78 mm2mils100(viacol * CoreSquare / 5), \
79 mm2mils100(viarow * CoreSquare / 5), \
82 mm2mils100((CoreSquare)/5), \
83 '"pin37" "37" "square"]'
86 for pin in range (1,10):
88 mm2mils100(-2.5 + pin * PinSpacing), \
89 mm2mils100(-Overall/2 + PinWidth/2), \
90 mm2mils100(-2.5 + pin * PinSpacing), \
91 mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
92 mm2mils100(PinWidth), \
93 mm2mils100(PinSpacing - PinWidth), \
94 mm2mils100(PinResist), \
95 '"pin%i"' % (28-pin), '"%i"' % (28-pin), '0x0000]'
98 mm2mils100(-2.5 + pin * PinSpacing), \
99 mm2mils100(+Overall/2 - PinHeight + PinWidth/2), \
100 mm2mils100(-2.5 + pin * PinSpacing), \
101 mm2mils100(+Overall/2 - PinWidth/2), \
102 mm2mils100(PinWidth), \
103 mm2mils100(PinSpacing - PinWidth), \
104 mm2mils100(PinResist), \
105 '"pin%i"' % pin, '"%i"' % pin, '0x0000]'
108 mm2mils100(Overall/2 - PinHeight + PinWidth/2), \
109 mm2mils100(-2.5 + pin * PinSpacing), \
110 mm2mils100(Overall/2 - PinWidth/2), \
111 mm2mils100(-2.5 + pin * PinSpacing), \
112 mm2mils100(PinWidth), \
113 mm2mils100(PinSpacing - PinWidth), \
114 mm2mils100(PinResist), \
115 '"pin%i"' % (19-pin), '"%i"' % (19-pin), '0x0000]'
118 mm2mils100(-Overall/2 + PinWidth/2), \
119 mm2mils100(-2.5 + pin * PinSpacing), \
120 mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
121 mm2mils100(-2.5 + pin * PinSpacing), \
122 mm2mils100(PinWidth), \
123 mm2mils100(PinSpacing - PinWidth), \
124 mm2mils100(PinResist), \
125 '"pin%i"' % (27+pin), '"%i"' % (27+pin), '0x0000]'
127 print ' ElementArc[',\
130 '500 500 0 360 1000 ]'