add footprint generator for audio amp

diff --git a/packages/Makefile b/packages/Makefile
index c20bd7ad2f10e8b0c7e8b042fd292866929ac362..53deeeacce5bbf027d7dfeebdc419f4f38339543 100644 (file)
--- a/packages/Makefile
+++ b/packages/Makefile
@@ -69,7 +69,8 @@ FOOTPRINTS= \
        PCM12SMTR.fp \
        usbAmale.fp \
        nx3215sa.fp \
-       DR127.fp
+       DR127.fp \
+       PowerPAD32.fp
 
 .5c.fp:
        nickle $*.5c > $@

diff --git a/packages/PowerPAD32.py b/packages/PowerPAD32.py
new file mode 100755 (executable)
index 0000000..ade5f54
--- /dev/null
+++ b/packages/PowerPAD32.py
@@ -0,0 +1,130 @@
+#!/usr/bin/python
+# Copyright 2014 by Bdale Garbee <bdale@gag.com>.  GPLv2
+#
+# Program to emit PCB footprint for PowerPAD 32-pin package used by TPA3118
+#
+
+# dimensions in mm from the TI tpa3116d2.pdf datasheet
+PinWidth = 0.3
+PinResist = 0.44               # width of gap in solder resist over pad
+PinHeight = 1.80
+PinSpacing = 0.65
+PinRow = 7.4                   # center to center of pin rows
+
+PadWidth = 11.0                        # ground pad under part
+PadHeight = 5.2
+
+MaskWidth = 4.36               # opening in solder mask for ground pad
+MaskHeight = 4.11              
+
+ViaGrid = 1.3                  # spacing between vias in ground pad
+
+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 "PowerPAD32" "" "" 0 0 0 0 0 100 0x0]'
+print "("
+
+# vias in the ground pad under the chip
+for viarow in range (-2,2):
+  for viacol in range (-4,4):
+    print '   Pin[',\
+       mm2mils100(viacol * ViaGrid + ViaGrid/2), \
+       mm2mils100(viarow * ViaGrid + ViaGrid/2), \
+       2700, \
+       2500, \
+       0, \
+       1300, \
+       '"pin33" "33" 0x0002]'
+
+# break pad under chip into a grid to control the resist and paste masks
+for viarow in range (-3, 4):
+  for viacol in range (-8, 9):
+    if (viacol in (-3, -2, -1, 0, 1, 2, 3)):
+      # copper sub-square without resist, with paste
+      print '   Pad[',\
+       mm2mils100(viacol * ViaGrid/2), \
+       mm2mils100(viarow * ViaGrid/2), \
+       mm2mils100(viacol * ViaGrid/2), \
+       mm2mils100(viarow * ViaGrid/2), \
+       mm2mils100(ViaGrid/2), \
+       0, \
+       mm2mils100(ViaGrid/2), \
+       '"pin33" "33" "square"]'
+    else:
+      # copper sub-square with resist over vias
+      print '   Pad[',\
+       mm2mils100(viacol * ViaGrid/2), \
+       mm2mils100(viarow * ViaGrid/2), \
+       mm2mils100(viacol * ViaGrid/2), \
+       mm2mils100(viarow * ViaGrid/2), \
+       mm2mils100(ViaGrid/2), \
+       0, \
+       0, \
+       '"pin33" "33" "square,nopaste"]'
+
+# pins
+for pin in range (1,17):
+    print '   Pad[',\
+       mm2mils100((pin - 8.5) * PinSpacing), \
+       mm2mils100(PinRow/2 - PinHeight/2 + PinWidth/2), \
+       mm2mils100((pin - 8.5) * PinSpacing), \
+       mm2mils100(PinRow/2 + PinHeight/2 - PinWidth/2), \
+       mm2mils100(PinWidth), \
+       mm2mils100(PinSpacing - PinWidth), \
+       mm2mils100(PinResist), \
+       '"pin%i"' % (pin), '"%i"' % (pin), '"square"]'
+
+    print '   Pad[',\
+       mm2mils100((pin - 8.5) * PinSpacing), \
+       mm2mils100(-PinRow/2 + PinHeight/2 - PinWidth/2), \
+       mm2mils100((pin - 8.5) * PinSpacing), \
+       mm2mils100(-PinRow/2 - PinHeight/2 + PinWidth/2), \
+       mm2mils100(PinWidth), \
+       mm2mils100(PinSpacing - PinWidth), \
+       mm2mils100(PinResist), \
+       '"pin%i"' % (33-pin), '"%i"' % (33-pin), '"square"]'
+
+#    print '   Pad[',\
+#      mm2mils100(-2.5 + pin * PinSpacing), \
+#      mm2mils100(+Overall/2 - PinHeight + PinWidth/2), \
+#      mm2mils100(-2.5 + 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(-2.5 + pin * PinSpacing), \
+#      mm2mils100(Overall/2 - PinWidth/2), \
+#      mm2mils100(-2.5 + pin * PinSpacing), \
+#      mm2mils100(PinWidth), \
+#      mm2mils100(PinSpacing - PinWidth), \
+#      mm2mils100(PinResist), \
+#      '"pin%i"' % (19-pin), '"%i"' % (19-pin), '0x0000]'
+#
+#    print '   Pad[',\
+#      mm2mils100(-Overall/2 + PinWidth/2), \
+#      mm2mils100(-2.5 + pin * PinSpacing), \
+#      mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
+#      mm2mils100(-2.5 + pin * PinSpacing), \
+#      mm2mils100(PinWidth), \
+#      mm2mils100(PinSpacing - PinWidth), \
+#      mm2mils100(PinResist), \
+#      '"pin%i"' % (27+pin), '"%i"' % (27+pin), '0x0000]'
+
+print '   ElementArc[',\
+       mm2mils100(-7.5 * PinSpacing), \
+       mm2mils100(PinRow/2 + PinHeight * 0.75), \
+       '500 500 0 360 1000 ]'
+print ")"