add first-cut footprint for sam21d qfn package

diff --git a/packages/.gitignore b/packages/.gitignore
index 61db65cbc794a3f3f0efba7155eccb3b20edd574..a88e125597ee720a46f930b59770b1d33d598a36 100644 (file)
--- a/packages/.gitignore
+++ b/packages/.gitignore
@@ -141,3 +141,5 @@ DSE0006A.fp
 U-DFN2020-6-F.fp
 711AT.fp
 PG-TSDSO-14.fp
+dualbeeper.fp
+vqfn-48.fp

diff --git a/packages/Makefile b/packages/Makefile
index 8bf4d33034e849610d7df1e3e901ddf59a096cd0..3e243d149b29c083190a4c22871cea73df5e1659 100644 (file)
--- a/packages/Makefile
+++ b/packages/Makefile
@@ -157,7 +157,8 @@ FOOTPRINTS= \
        U-DFN2020-6-F.fp \
        711AT.fp \
        PG-TSDSO-14.fp \
-       dualbeeper.fp
+       dualbeeper.fp \
+       vqfn-48.fp
 
 .5c.fp:
        nickle $*.5c -o $@

diff --git a/packages/vqfn-48.py b/packages/vqfn-48.py
new file mode 100755 (executable)
index 0000000..50c2664
--- /dev/null
+++ b/packages/vqfn-48.py
@@ -0,0 +1,145 @@
+#!/usr/bin/python2
+# Copyright 2022 by Bdale Garbee <bdale@gag.com>.  GPLv3
+#
+# emit PCB footprint for Atmel VQFN-48 package used by SAM21D
+#
+
+# dimensions in mm from 
+#      atmel/samd21/SAM_D21_DA1_Family_Data_Sheet_DS40001882H-2580554.pdf
+
+PinWidth = 0.3   # X1
+PinHeight = 0.85  # Y1
+RowSpacing = 6.9  # C1 / C2
+PinSpacing = 0.5  # E
+Overall = 7.0
+GndSquare = 5.25  # X2 / Y2
+CoreSquare = 2.1
+PinClearance = 2 * (PinSpacing - PinWidth)
+
+# ATMEL specifies 120-150 microns between pad and solder mask
+# AT88RF1354 Appplication note  .. should be good here too?
+#
+PinResist = PinWidth + (2 * 0.07)
+
+# 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 3'
+print '# use-license: unlimited'
+
+print 'Element[0x0 "vqfn-48" "" "" 0 0 0 0 0 100 0x0]'
+print "("
+
+## pad under the chip
+#print '   Pad[',\
+#      mm2mils100(0), \
+#      mm2mils100(0), \
+#      mm2mils100(0), \
+#      mm2mils100(0), \
+#      mm2mils100(GndSquare), \
+#      mm2mils100(PinClearance), \
+#      mm2mils100(PinResist), \
+#      '"pin49" "49" "square,nopaste"]'
+#
+## vias in the ground pad under the chip
+#for viarow in range (-1,1):
+#  for viacol in range (-1,1):
+#    print '   Pin[',\
+#      mm2mils100(1.8 * viacol * CoreSquare / 3 + .9 * CoreSquare/3), \
+#      mm2mils100(1.8 * viarow * CoreSquare / 3 + .9 * CoreSquare/3), \
+#      2600, \
+#      2500, \
+#      0, \
+#      1300, \
+#      '"pin17" "17" 0x0002]'
+#
+## break pad under chip into a grid to control the resist and paste masks
+#
+#blocks=3;
+#
+#for viarow in range (-1, 2):
+#  for viacol in range (-1, 2):
+#    if (viarow in (-1, 1)) and (viacol in (-1, 1)):
+#      # copper sub-square with resist over vias
+#      print '   Pad[',\
+#      mm2mils100(viacol * CoreSquare / blocks), \
+#      mm2mils100(viarow * CoreSquare / blocks), \
+#      mm2mils100(viacol * CoreSquare / blocks), \
+#      mm2mils100(viarow * CoreSquare / blocks), \
+#      mm2mils100((CoreSquare)/blocks), \
+#      0, \
+#      0, \
+#      '"pin17" "17" "square,nopaste"]'
+#    else:
+#      # copper sub-square without resist
+#      print '   Pad[',\
+#      mm2mils100(viacol * CoreSquare / blocks), \
+#      mm2mils100(viarow * CoreSquare / blocks), \
+#      mm2mils100(viacol * CoreSquare / blocks), \
+#      mm2mils100(viarow * CoreSquare / blocks), \
+#      mm2mils100((CoreSquare)/blocks), \
+#      0, \
+#      mm2mils100((CoreSquare)/blocks), \
+#      '"pin17" "17" "square,nopaste"]'
+#      # copper spot to control paste mask generation
+#      print '   Pad[',\
+#      mm2mils100(viacol * CoreSquare / blocks), \
+#      mm2mils100(viarow * CoreSquare / blocks), \
+#      mm2mils100(viacol * CoreSquare / blocks), \
+#      mm2mils100(viarow * CoreSquare / blocks), \
+#      1500, \
+#      0, \
+#      mm2mils100((CoreSquare)/blocks), \
+#      '"pin17" "17" "square"]'
+
+# pins
+for pin in range (1,13):
+    print '   Pad[',\
+       mm2mils100((-6.5 + pin) * PinSpacing), \
+       mm2mils100(-RowSpacing/2 - PinHeight/2 + PinWidth/2), \
+       mm2mils100((-6.5 + pin) * PinSpacing), \
+       mm2mils100(-RowSpacing/2 + PinHeight/2 - PinWidth/2), \
+       mm2mils100(PinWidth), \
+       mm2mils100(PinClearance), \
+       mm2mils100(PinResist), \
+       '"pin%i"' % (37-pin), '"%i"' % (37-pin), '0x0000]'
+
+    print '   Pad[',\
+       mm2mils100((-6.5 + pin) * PinSpacing), \
+       mm2mils100(RowSpacing/2 - PinHeight/2 + PinWidth/2), \
+       mm2mils100((-6.5 + pin) * PinSpacing), \
+       mm2mils100(RowSpacing/2 + PinHeight/2 - PinWidth/2), \
+       mm2mils100(PinWidth), \
+       mm2mils100(PinClearance), \
+       mm2mils100(PinResist), \
+       '"pin%i"' % pin, '"%i"' % pin, '0x0000]'
+      
+    print '   Pad[',\
+       mm2mils100(-RowSpacing/2 - PinHeight/2 + PinWidth/2), \
+       mm2mils100((-6.5 + pin) * PinSpacing), \
+       mm2mils100(-RowSpacing/2 + PinHeight/2 - PinWidth/2), \
+       mm2mils100((-6.5 + pin) * PinSpacing), \
+       mm2mils100(PinWidth), \
+       mm2mils100(PinClearance), \
+       mm2mils100(PinResist), \
+       '"pin%i"' % (36+pin), '"%i"' % (36+pin), '0x0000]'
+
+    print '   Pad[',\
+       mm2mils100(RowSpacing/2 - PinHeight/2 + PinWidth/2), \
+       mm2mils100((-6.5 + pin) * PinSpacing), \
+       mm2mils100(RowSpacing/2 + PinHeight/2 - PinWidth/2), \
+       mm2mils100((-6.5 + pin) * PinSpacing), \
+       mm2mils100(PinWidth), \
+       mm2mils100(PinClearance), \
+       mm2mils100(PinResist), \
+       '"pin%i"' % (25-pin), '"%i"' % (25-pin), '0x0000]'
+
+print '   ElementArc[',\
+       mm2mils100(-Overall/2 - PinWidth), \
+       mm2mils100(Overall/2 + PinWidth), \
+       '500 500 0 360 1000 ]'
+print ")"