add qfn-44 for ATmega32U4

diff --git a/packages/Makefile b/packages/Makefile
index 5c9fad2ad35f1ec62faf2459e600aabb2dbfb7bc..96a6bcbf00bdf220361fed52f8a5472f14f92569 100644 (file)
--- a/packages/Makefile
+++ b/packages/Makefile
@@ -57,6 +57,7 @@ FOOTPRINTS= \
        8ufson2x2.fp \
        ti-qfn20.fp \
        qfn-16.fp \
+       qfn-44.fp \
        ap.10g.fp \
        BTM182.fp \
        NHD-C0216.fp \

diff --git a/packages/qfn-44.py b/packages/qfn-44.py
new file mode 100755 (executable)
index 0000000..3c12b6b
--- /dev/null
+++ b/packages/qfn-44.py
@@ -0,0 +1,84 @@
+#!/usr/bin/python3
+# Copyright 2024 by Bdale Garbee <bdale@gag.com>.  GPLv3
+#
+# emit PCB footprint for QFN-44 package used by ATmega32U4
+# - leaving out the under-chip pad as it's not necessary
+#
+
+# dimensions in mm from 
+#      atmel/samd21/ATmega32U4.pdf
+
+PinWidth = 0.3   # X1
+PinHeight = 0.85  # Y1
+RowSpacing = 6.9  # C1 / C2
+PinSpacing = 0.5  # E
+Overall = 7.0
+GndSquare = 5.20  # 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 "qfn-44" "" "" 0 0 0 0 0 100 0x0]')
+print("(")
+
+# pins
+for pin in range (1,12):
+    print('   Pad[',\
+       mm2mils100((-6 + pin) * PinSpacing), \
+       mm2mils100(-RowSpacing/2 - PinHeight/2 + PinWidth/2), \
+       mm2mils100((-6 + pin) * PinSpacing), \
+       mm2mils100(-RowSpacing/2 + PinHeight/2 - PinWidth/2), \
+       mm2mils100(PinWidth), \
+       mm2mils100(PinClearance), \
+       mm2mils100(PinResist), \
+       '"pin%i"' % (34-pin), '"%i"' % (34-pin), '0x0000]')
+
+    print('   Pad[',\
+       mm2mils100((-6 + pin) * PinSpacing), \
+       mm2mils100(RowSpacing/2 - PinHeight/2 + PinWidth/2), \
+       mm2mils100((-6 + 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 + pin) * PinSpacing), \
+       mm2mils100(-RowSpacing/2 + PinHeight/2 - PinWidth/2), \
+       mm2mils100((-6 + pin) * PinSpacing), \
+       mm2mils100(PinWidth), \
+       mm2mils100(PinClearance), \
+       mm2mils100(PinResist), \
+       '"pin%i"' % (33+pin), '"%i"' % (33+pin), '0x0000]')
+
+    print('   Pad[',\
+       mm2mils100(RowSpacing/2 - PinHeight/2 + PinWidth/2), \
+       mm2mils100((-6 + pin) * PinSpacing), \
+       mm2mils100(RowSpacing/2 + PinHeight/2 - PinWidth/2), \
+       mm2mils100((-6 + pin) * PinSpacing), \
+       mm2mils100(PinWidth), \
+       mm2mils100(PinClearance), \
+       mm2mils100(PinResist), \
+       '"pin%i"' % (23-pin), '"%i"' % (23-pin), '0x0000]')
+
+print('   ElementArc[',\
+       mm2mils100(-Overall/2 - PinWidth), \
+       mm2mils100(Overall/2 + PinWidth), \
+       '500 500 0 360 1000 ]')
+print(")")