fix clearances, etc, identified during TeleMetrum v0.2 drc

[hw/bdale] / pkg / newlib / QFN36.py

diff --git a/pkg/newlib/QFN36.py b/pkg/newlib/QFN36.py
index 09ec258f7ab80fe7b5e5ec53722bd9daa09bda26..a02e6efe16a3acefa1c4be22492b0f2484e5f50e 100755 (executable)
--- a/pkg/newlib/QFN36.py
+++ b/pkg/newlib/QFN36.py
@@ -1,15 +1,17 @@
 #!/usr/bin/python
-# Copyright 2007 by Bdale Garbee <bdale@gag.com>.  GPLv2
+# Copyright 2008 by Bdale Garbee <bdale@gag.com>.  GPLv2
 #
 # Program to emit PCB footprint for QFN36 package used by TI CC1111
 #
 
 # dimensions in mm from the TI cc1111f32.pdf datasheet
-PinWidth = 0.28
+PinWidth = 0.28                
+PinResist = 0.381              # width of gap in solder resist over pad
 PinHeight = 0.75
 PinSpacing = 0.50
 Overall = 6.30
-CoreSquare = 4.40
+GndSquare = 4.40
+CoreSquare = 3.7592            # resist gaps and paste spots over ground tab
 PinSquare = 4.80
 
 import sys
@@ -18,6 +20,11 @@ import sys
 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 "("
 
@@ -27,38 +34,59 @@ print '   Pad[',\
        mm2mils100(0), \
        mm2mils100(0), \
        mm2mils100(0), \
-       mm2mils100(CoreSquare), \
-       mm2mils100((CoreSquare - PinSquare) / 2), \
-       mm2mils100(CoreSquare), \
-       '"pin37" "37" 0x0100]'
+       mm2mils100(GndSquare), \
+       0, \
+       0, \
+       '"pin37" "37" "square,nopaste"]'
 
 # vias in the ground pad under the chip
-for via in range (-1,2):
+for viarow in range (-1,2):
+  for viacol in range (-1,2):
     print '   Pin[',\
-       mm2mils100(-CoreSquare / 3), \
-       mm2mils100(via * CoreSquare / 3), \
-       2500, \
-       2600, \
-       0, \
-       1700, \
-       '"pin37" "37" 0x0002]'
-    print '   Pin[',\
-       mm2mils100(0), \
-       mm2mils100(via * CoreSquare / 3), \
-       2500, \
-       2600, \
+       mm2mils100(2 * viacol * CoreSquare / 5), \
+       mm2mils100(2 * viarow * CoreSquare / 5), \
+       2800, \
+       1000, \
        0, \
-       1700, \
-       '"pin37" "37" 0x0002]'
-    print '   Pin[',\
-       mm2mils100(CoreSquare / 3), \
-       mm2mils100(via * CoreSquare / 3), \
-       2500, \
-       2600, \
-       0, \
-       1700, \
+       1500, \
        '"pin37" "37" 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 (1,10):
     print '   Pad[',\
@@ -68,7 +96,7 @@ for pin in range (1,10):
        mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
        mm2mils100(PinWidth), \
        mm2mils100(PinSpacing - PinWidth), \
-       mm2mils100(PinWidth + 0.1), \
+       mm2mils100(PinResist), \
        '"pin%i"' % (28-pin), '"%i"' % (28-pin), '0x0000]'
 
     print '   Pad[',\
@@ -78,7 +106,7 @@ for pin in range (1,10):
        mm2mils100(+Overall/2 - PinWidth/2), \
        mm2mils100(PinWidth), \
        mm2mils100(PinSpacing - PinWidth), \
-       mm2mils100(PinWidth + 0.1), \
+       mm2mils100(PinResist), \
        '"pin%i"' % pin, '"%i"' % pin, '0x0000]'
 
     print '   Pad[',\
@@ -88,7 +116,7 @@ for pin in range (1,10):
        mm2mils100(-2.5 + pin * PinSpacing), \
        mm2mils100(PinWidth), \
        mm2mils100(PinSpacing - PinWidth), \
-       mm2mils100(PinWidth + 0.1), \
+       mm2mils100(PinResist), \
        '"pin%i"' % (19-pin), '"%i"' % (19-pin), '0x0000]'
 
     print '   Pad[',\
@@ -98,7 +126,7 @@ for pin in range (1,10):
        mm2mils100(-2.5 + pin * PinSpacing), \
        mm2mils100(PinWidth), \
        mm2mils100(PinSpacing - PinWidth), \
-       mm2mils100(PinWidth + 0.1), \
+       mm2mils100(PinResist), \
        '"pin%i"' % (27+pin), '"%i"' % (27+pin), '0x0000]'
 
 print '   ElementArc[',\