From 49cc9190e35896f4ed00f4ca77cb3e1dfd031fc0 Mon Sep 17 00:00:00 2001
From: Bdale Garbee <bdale@gag.com>
Date: Thu, 25 Dec 2008 20:53:32 -0700
Subject: [PATCH] major update to get details like resist and paste layers
 right

---
 pkg/newlib/QFN36.py | 89 ++++++++++++++++++++++++++++-----------------
 1 file changed, 55 insertions(+), 34 deletions(-)

diff --git a/pkg/newlib/QFN36.py b/pkg/newlib/QFN36.py
index ee65180..12d34c3 100755
--- a/pkg/newlib/QFN36.py
+++ b/pkg/newlib/QFN36.py
@@ -5,11 +5,13 @@
 #
 
 # 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
@@ -22,44 +24,63 @@ print 'Element[0x0 "QFN36" "" "" 0 0 0 0 0 100 0x0]'
 print "("
 
 # pad under the chip, must be grounded
-# making the solder mask opening the recommended size, and the actual copper
-# pad 6 mils smaller ... hoping this helps us avoid signal pad shorts!
 print '   Pad[',\
  	mm2mils100(0), \
 	mm2mils100(0), \
  	mm2mils100(0), \
 	mm2mils100(0), \
-	mm2mils100(CoreSquare)-600, \
+	mm2mils100(GndSquare), \
 	0, \
- 	mm2mils100(CoreSquare), \
-	'"pin37" "37" 0x0100]'
+ 	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, \
-  	0, \
-  	1700, \
-	'"pin37" "37" 0x0002]'
-    print '   Pin[',\
-	mm2mils100(CoreSquare / 3), \
- 	mm2mils100(via * CoreSquare / 3), \
-	2500, \
-	2600, \
+	mm2mils100(2 * viacol * CoreSquare / 5), \
+ 	mm2mils100(2 * viarow * CoreSquare / 5), \
+	1600, \
+	0, \
   	0, \
-  	1700, \
-	'"pin37" "37" 0x0002]'
+  	1500, \
+	'"pin37" "37" 0x0000]'
+
+# 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):
@@ -70,7 +91,7 @@ for pin in range (1,10):
 	mm2mils100(-Overall/2 + PinHeight - PinWidth/2), \
 	mm2mils100(PinWidth), \
 	mm2mils100(PinSpacing - PinWidth), \
-  	mm2mils100(PinWidth)+600, \
+	mm2mils100(PinResist), \
 	'"pin%i"' % (28-pin), '"%i"' % (28-pin), '0x0000]'
 
     print '   Pad[',\
@@ -80,7 +101,7 @@ for pin in range (1,10):
 	mm2mils100(+Overall/2 - PinWidth/2), \
 	mm2mils100(PinWidth), \
 	mm2mils100(PinSpacing - PinWidth), \
-  	mm2mils100(PinWidth)+600, \
+	mm2mils100(PinResist), \
 	'"pin%i"' % pin, '"%i"' % pin, '0x0000]'
 
     print '   Pad[',\
@@ -90,7 +111,7 @@ for pin in range (1,10):
  	mm2mils100(-2.5 + pin * PinSpacing), \
 	mm2mils100(PinWidth), \
 	mm2mils100(PinSpacing - PinWidth), \
-  	mm2mils100(PinWidth)+600, \
+	mm2mils100(PinResist), \
 	'"pin%i"' % (19-pin), '"%i"' % (19-pin), '0x0000]'
 
     print '   Pad[',\
@@ -100,7 +121,7 @@ for pin in range (1,10):
  	mm2mils100(-2.5 + pin * PinSpacing), \
 	mm2mils100(PinWidth), \
 	mm2mils100(PinSpacing - PinWidth), \
-  	mm2mils100(PinWidth)+600, \
+	mm2mils100(PinResist), \
 	'"pin%i"' % (27+pin), '"%i"' % (27+pin), '0x0000]'
 
 print '   ElementArc[',\
-- 
2.30.2