Add TI s-pwson-n8 footprint (for drv8837)

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/packages/footprint.5c b/packages/footprint.5c
index 7e454891f38ecdf4af122f47ac4bd5a950d7762d..e6af81a9304f2332de4b7964cd762ffe08acff51 100644 (file)
--- a/packages/footprint.5c
+++ b/packages/footprint.5c
@@ -164,33 +164,50 @@ namespace Footprint {
                             name,
                             num);
        }
+       public void pad_mm_options(real center_x,
+                                  real center_y,
+                                  real width,
+                                  real height,
+                                  string name,
+                                  string num,
+                                  string options)
+       {
+               pad_mm_clear_options(center_x,
+                                    center_y,
+                                    width,
+                                    height,
+                                    process_clearance,
+                                    name,
+                                    num,
+                                    options);
+       }
 
-public void pad_mm_arbitrary(   real x1,
-                                real y1,
-                                real x2,
-                                real y2,
-                                real thickness,
-                                string name,
-                                string num,
-                                string options)
-{
-        real clearance = process_clearance;
+       public void pad_mm_arbitrary(   real x1,
+                                       real y1,
+                                       real x2,
+                                       real y2,
+                                       real thickness,
+                                       string name,
+                                       string num,
+                                       string options)
+       {
+               real clearance = process_clearance;
 
-        real mask = thickness + clearance / 2;
+               real mask = thickness + clearance / 2;
 
-        printf ("    Pad[");
-                printf (" %6d %6d %6d %6d",
-                        mm2mils100(x1),
-                        mm2mils100(y1),
-                        mm2mils100(x2),
-                        mm2mils100(y2));
-                printf (" %6d %6d %6d",
-                        mm2mils100(thickness),
-                        mm2mils100(clearance),
-                        mm2mils100(mask));
-                printf (" \"%s\" \"%s\" \"%s\"]\n",
-                        name, num, options);
-}
+               printf ("    Pad[");
+               printf (" %6d %6d %6d %6d",
+                       mm2mils100(x1),
+                       mm2mils100(y1),
+                       mm2mils100(x2),
+                       mm2mils100(y2));
+               printf (" %6d %6d %6d",
+                       mm2mils100(thickness),
+                       mm2mils100(clearance),
+                       mm2mils100(mask));
+               printf (" \"%s\" \"%s\" \"%s\"]\n",
+                       name, num, options);
+       }
 
        public void pin_mm_clear(real x, real y, real drill, real copper, real clearance,
                        string name,

diff --git a/packages/s-pwson-n8.5c b/packages/s-pwson-n8.5c
new file mode 100644 (file)
index 0000000..57952b9
--- /dev/null
+++ b/packages/s-pwson-n8.5c
@@ -0,0 +1,79 @@
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+load "footprint.5c"
+import Footprint;
+
+Footprint::process_clearance = 0.07;
+
+real pad_expose = 0.1;
+real pad_width = 0.28;
+real pad_height = 0.50;
+real pad_x_spacing = 0.50;
+real pad_y_gap = 1.4;
+real pad_y_spacing = pad_y_gap + pad_height;
+
+real package_width = 2;
+real package_height = 2;
+
+real center_width = 1.6;
+real center_height = 0.9;
+
+
+real pad_x_off = package_width / 2 - (pad_width - pad_expose) / 2 + pad_expose;
+
+real num_pad = 4;      /* per side */
+
+element_start("s-pwson-n8");
+
+/* full center pad */
+pad_mm_options(0, 0, center_width, center_height, "9", "9", "square,nopaste");
+
+/* 63% paste coverage */
+real paste_coverage = 0.63;
+real paste_coverage_scale = sqrt(paste_coverage);
+pad_mm_options(0, 0, center_width * paste_coverage_scale,
+              center_height * paste_coverage_scale, "9", "9", "square");
+
+real pad_y_off = pad_y_spacing / 2;
+
+real pad_off(int n) {
+       return pad_x_spacing * (n - (num_pad - 1) / 2);
+}
+
+for (int pad = 0; pad < num_pad; pad++) {
+       /* bottom side (1-4) */
+
+       pad_mm(pad_off(pad),
+              -pad_y_off,
+              pad_width,
+              pad_height,
+              sprintf("%d", pad + 1),
+              sprintf("%d", pad + 1));
+       
+       /* top side (8-5) */
+
+       pad_mm(pad_off(pad),
+              pad_y_off,
+              pad_width,
+              pad_height,
+              sprintf("%d", 8 - pad),
+              sprintf("%d", 8 - pad));
+       
+}
+
+element_end();