From: Bdale Garbee <bdale@gag.com>
Date: Sat, 22 Jan 2022 06:57:43 +0000 (-0700)
Subject: add first-cut footprint for sam21d qfn package
X-Git-Tag: telelco-v3.0~174
X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=9bae15ccdb4c49f5c29e20099b0583824b25ad64;p=hw%2Faltusmetrum

add first-cut footprint for sam21d qfn package
---

diff --git a/packages/.gitignore b/packages/.gitignore
index 61db65c..a88e125 100644
--- 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 8bf4d33..3e243d1 100644
--- 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
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 ")"