footprint for the eeprom used on Pi HAT cards

diff --git a/packages/udfn8.5c b/packages/udfn8.5c
new file mode 100644 (file)
index 0000000..52be72b
--- /dev/null
+++ b/packages/udfn8.5c
@@ -0,0 +1,78 @@
+/*
+ * Copyright © 2021 Bdale Garbee <bdale@gag.com>
+ * GPL v3
+ */
+
+/* intended for use with the onsemi CAT24C32 eeprom and similar chips */
+
+load "footprint.5c"
+import Footprint;
+
+real pad_width = 0.68;
+real pad_height = 0.30;
+real pad_spacing = 0.50;               /* center to center, along the pads */
+real pad_center = 3.40-pad_width;      /* center to center, across the part */
+
+real center_width = 1.45;
+real center_height = 1.56;
+
+real package_width = 3;
+real package_height = 2;
+
+real pad_x_off = pad_center / 2;
+
+real num_pad = 4;      /* per side */
+
+element_start("udfn8");
+
+real pad_off(int n) {
+       return pad_spacing * (n - (num_pad - 1) / 2);
+}
+
+real corner(int dx, int dy) {
+       real    x = dx * package_width / 2;
+       real    y = dy * package_height / 2;
+       real    len = 0.4;
+
+       line(x, y, x - dx * len, y);
+       line(x, y, x, y - dy * len);
+}
+
+corner(-1, -1);
+corner(1, -1);
+corner(-1, 1);
+corner(1, 1);
+
+real dot_off = -.3;
+
+line(-package_width/2 + dot_off, -package_height/2 + dot_off,
+     -package_width/2 + dot_off, -package_height/2 + dot_off);
+
+for (int pad = 0; pad < num_pad; pad++) {
+       /* left side (1-4) */
+
+       pad_mm(-pad_x_off,
+              pad_off(pad),
+              pad_width,
+              pad_height,
+              sprintf("%d", pad + 1),
+              sprintf("%d", pad + 1));
+       
+       /* right side (5-8) */
+
+       pad_mm(pad_x_off,
+              -pad_off(pad),
+              pad_width,
+              pad_height,
+              sprintf("%d", pad + 5),
+              sprintf("%d", pad + 5));
+       
+}
+
+/* center pad */
+pad_mm(0, 0,
+       center_width,
+       center_height,
+       "9", "9");
+
+element_end();