2 # Copyright 2011 by Bdale Garbee <bdale@gag.com>. GPLv2
4 # Program to emit PCB footprint for MO-220 package used by the ATTiny85
7 # dimensions in mm from the ATTiny datasheed
13 GndSquare = 2.60 # D2 & E2
16 # ATMEL specifies 120-150 microns between pad and solder mask
17 # AT88RF1354 Appplication note
19 PinResist = PinWidth + (2 * 0.07)
23 # we're going to use the 1/100 of a mil fundamental unit form
26 return int( mm / 25.4 * 1000.0 * 100.0 + 0.5 )
28 print '# author: Keith Packard'
29 print '# email: keithp@keithp.com'
30 print '# dist-license: GPL 2'
31 print '# use-license: unlimited'
33 print 'Element[0x0 "MO-220" "" "" 0 0 0 0 0 100 0x0]'
36 # pad under the chip, must be grounded
42 mm2mils100(GndSquare), \
45 '"pin21" "21" "square,nopaste"]'
47 # vias in the ground pad under the chip
48 #for viarow in range (-1,2):
49 # for viacol in range (-1,2):
51 # mm2mils100(2 * viacol * CoreSquare / 5), \
52 # mm2mils100(2 * viarow * CoreSquare / 5), \
57 # '"pin21" "21" 0x0002]'
59 # break pad under chip into a grid to control the resist and paste masks
63 for viarow in range (-1, 2):
64 for viacol in range (-1, 2):
65 if (viarow in (-1, 1)) and (viacol in (-1, 1)):
66 # copper sub-square with resist over vias
68 mm2mils100(viacol * CoreSquare / blocks), \
69 mm2mils100(viarow * CoreSquare / blocks), \
70 mm2mils100(viacol * CoreSquare / blocks), \
71 mm2mils100(viarow * CoreSquare / blocks), \
72 mm2mils100((CoreSquare)/blocks), \
75 '"pin21" "21" "square,nopaste"]'
77 # copper sub-square without resist
79 mm2mils100(viacol * CoreSquare / blocks), \
80 mm2mils100(viarow * CoreSquare / blocks), \
81 mm2mils100(viacol * CoreSquare / blocks), \
82 mm2mils100(viarow * CoreSquare / blocks), \
83 mm2mils100((CoreSquare)/blocks), \
85 mm2mils100((CoreSquare)/blocks), \
86 '"pin21" "21" "square,nopaste"]'
87 # copper spot to control paste mask generation
89 mm2mils100(viacol * CoreSquare / blocks), \
90 mm2mils100(viarow * CoreSquare / blocks), \
91 mm2mils100(viacol * CoreSquare / blocks), \
92 mm2mils100(viarow * CoreSquare / blocks), \
95 mm2mils100((CoreSquare)/blocks), \
96 '"pin21" "21" "square"]'
99 for pin in range (1,6):
101 mm2mils100((-3 + pin) * PinSpacing), \
102 mm2mils100(-Overall/2 + PinWidth/2), \
103 mm2mils100((-3 + pin) * PinSpacing), \
104 mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
105 mm2mils100(PinWidth), \
106 mm2mils100(PinSpacing - PinWidth), \
107 mm2mils100(PinResist), \
108 '"pin%i"' % (16-pin), '"%i"' % (16-pin), '0x0000]'
111 mm2mils100((-3 + pin) * PinSpacing), \
112 mm2mils100(+Overall/2 - PinHeight + PinWidth/2), \
113 mm2mils100((-3 + pin) * PinSpacing), \
114 mm2mils100(+Overall/2 - PinWidth/2), \
115 mm2mils100(PinWidth), \
116 mm2mils100(PinSpacing - PinWidth), \
117 mm2mils100(PinResist), \
118 '"pin%i"' % pin, '"%i"' % pin, '0x0000]'
121 mm2mils100(Overall/2 - PinHeight + PinWidth/2), \
122 mm2mils100((-3 + pin) * PinSpacing), \
123 mm2mils100(Overall/2 - PinWidth/2), \
124 mm2mils100((-3 + pin) * PinSpacing), \
125 mm2mils100(PinWidth), \
126 mm2mils100(PinSpacing - PinWidth), \
127 mm2mils100(PinResist), \
128 '"pin%i"' % (11-pin), '"%i"' % (11-pin), '0x0000]'
131 mm2mils100(-Overall/2 + PinWidth/2), \
132 mm2mils100((-3 + pin) * PinSpacing), \
133 mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
134 mm2mils100((-3 + pin) * PinSpacing), \
135 mm2mils100(PinWidth), \
136 mm2mils100(PinSpacing - PinWidth), \
137 mm2mils100(PinResist), \
138 '"pin%i"' % (15+pin), '"%i"' % (15+pin), '0x0000]'
140 print ' ElementArc[',\
143 '500 500 0 360 1000 ]'