2 # Copyright 2011 by Bdale Garbee <bdale@gag.com>. GPLv2
3 # Copyright 2019 by Keith Packard <keithp@keithp.com>. GPLv2+
4 # Copyright 2024 by Bdale Garbee <bdale@gag.com>. GPLv3
6 # Program to emit PCB footprint for WQFN-16 package used by the DRV8800
9 # dimensions in mm from the DRV8800
15 GndSquare = 2.1 # D2 & E2
17 PinClearance = 2 * (PinSpacing - PinWidth)
19 # ATMEL specifies 120-150 microns between pad and solder mask
20 # AT88RF1354 Appplication note
22 PinResist = PinWidth + (2 * 0.07)
26 # we're going to use the 1/100 of a mil fundamental unit form
29 return int( mm / 25.4 * 1000.0 * 100.0 + 0.5 )
31 print('# author: Keith Packard')
32 print('# email: keithp@keithp.com')
33 print('# dist-license: GPL 3')
34 print('# use-license: unlimited')
36 print('Element[0x0 "qfn-16" "" "" 0 0 0 0 0 100 0x0]')
39 # pad under the chip, must be grounded
45 mm2mils100(GndSquare), \
46 mm2mils100(PinClearance), \
47 mm2mils100(PinResist), \
48 '"pin17" "17" "square,nopaste"]')
50 # vias in the ground pad under the chip
51 for viarow in range (-1,1):
52 for viacol in range (-1,1):
54 mm2mils100(1.8 * viacol * CoreSquare / 3 + .9 * CoreSquare/3), \
55 mm2mils100(1.8 * viarow * CoreSquare / 3 + .9 * CoreSquare/3), \
60 '"pin17" "17" 0x0002]')
62 # break pad under chip into a grid to control the resist and paste masks
66 for viarow in range (-1, 2):
67 for viacol in range (-1, 2):
68 if (viarow in (-1, 1)) and (viacol in (-1, 1)):
69 # copper sub-square with resist over vias
71 mm2mils100(viacol * CoreSquare / blocks), \
72 mm2mils100(viarow * CoreSquare / blocks), \
73 mm2mils100(viacol * CoreSquare / blocks), \
74 mm2mils100(viarow * CoreSquare / blocks), \
75 mm2mils100((CoreSquare)/blocks), \
78 '"pin17" "17" "square,nopaste"]')
80 # copper sub-square without resist
82 mm2mils100(viacol * CoreSquare / blocks), \
83 mm2mils100(viarow * CoreSquare / blocks), \
84 mm2mils100(viacol * CoreSquare / blocks), \
85 mm2mils100(viarow * CoreSquare / blocks), \
86 mm2mils100((CoreSquare)/blocks), \
88 mm2mils100((CoreSquare)/blocks), \
89 '"pin17" "17" "square,nopaste"]')
90 # copper spot to control paste mask generation
92 mm2mils100(viacol * CoreSquare / blocks), \
93 mm2mils100(viarow * CoreSquare / blocks), \
94 mm2mils100(viacol * CoreSquare / blocks), \
95 mm2mils100(viarow * CoreSquare / blocks), \
98 mm2mils100((CoreSquare)/blocks), \
99 '"pin17" "17" "square"]')
102 for pin in range (1,5):
104 mm2mils100((-2.5 + pin) * PinSpacing), \
105 mm2mils100(-Overall/2 + PinWidth/2), \
106 mm2mils100((-2.5 + pin) * PinSpacing), \
107 mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
108 mm2mils100(PinWidth), \
109 mm2mils100(PinClearance), \
110 mm2mils100(PinResist), \
111 '"pin%i"' % (13-pin), '"%i"' % (13-pin), '0x0000]')
114 mm2mils100((-2.5 + pin) * PinSpacing), \
115 mm2mils100(+Overall/2 - PinHeight + PinWidth/2), \
116 mm2mils100((-2.5 + pin) * PinSpacing), \
117 mm2mils100(+Overall/2 - PinWidth/2), \
118 mm2mils100(PinWidth), \
119 mm2mils100(PinClearance), \
120 mm2mils100(PinResist), \
121 '"pin%i"' % pin, '"%i"' % pin, '0x0000]')
124 mm2mils100(Overall/2 - PinHeight + PinWidth/2), \
125 mm2mils100((-2.5 + pin) * PinSpacing), \
126 mm2mils100(Overall/2 - PinWidth/2), \
127 mm2mils100((-2.5 + pin) * PinSpacing), \
128 mm2mils100(PinWidth), \
129 mm2mils100(PinClearance), \
130 mm2mils100(PinResist), \
131 '"pin%i"' % (9-pin), '"%i"' % (9-pin), '0x0000]')
134 mm2mils100(-Overall/2 + PinWidth/2), \
135 mm2mils100((-2.5 + pin) * PinSpacing), \
136 mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
137 mm2mils100((-2.5 + pin) * PinSpacing), \
138 mm2mils100(PinWidth), \
139 mm2mils100(PinClearance), \
140 mm2mils100(PinResist), \
141 '"pin%i"' % (12+pin), '"%i"' % (12+pin), '0x0000]')
143 print(' ElementArc[',\
146 '500 500 0 360 1000 ]')