From: Keith Packard <keithp@keithp.com>
Date: Sun, 3 Nov 2013 01:45:08 +0000 (-0700)
Subject: Fix clearance for s-pwson-n8 footprint, make TI DRV8837 use it
X-Git-Tag: telelco-v3.0~821
X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=580ba30f816d52b386e85d1bb9d2627f292c9930;p=hw%2Faltusmetrum

Fix clearance for s-pwson-n8 footprint, make TI DRV8837 use it

Fix the solder mask and copper clearance values so that the mask goes
between the pins while the copper keeps away.

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

diff --git a/packages/Makefile b/packages/Makefile
index 52e670a..103ad78 100644
--- a/packages/Makefile
+++ b/packages/Makefile
@@ -9,6 +9,7 @@ DIRS= \
 	tyco
 
 FOOTPRINTS= \
+	s-pwson-n8.fp \
 	MS5607.fp \
 	uson-8.fp \
 	wson6x5.fp \
diff --git a/packages/s-pwson-n8.5c b/packages/s-pwson-n8.5c
index 57952b9..14b8fbb 100644
--- a/packages/s-pwson-n8.5c
+++ b/packages/s-pwson-n8.5c
@@ -33,6 +33,8 @@ real package_height = 2;
 real center_width = 1.6;
 real center_height = 0.9;
 
+real clearance = 0.0061 * 25.4;
+real mask = 0.07;
 
 real pad_x_off = package_width / 2 - (pad_width - pad_expose) / 2 + pad_expose;
 
@@ -41,13 +43,13 @@ 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");
+pad_mm_clear_mask_options(0, 0, center_width, center_height, 0, center_height + mask, "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");
+pad_mm_clear_mask_options(0, 0, center_width * paste_coverage_scale,
+			  center_height * paste_coverage_scale, 0, center_height + mask, "9", "9", "square");
 
 real pad_y_off = pad_y_spacing / 2;
 
@@ -58,21 +60,23 @@ real pad_off(int n) {
 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));
+	pad_mm_clear_mask_options(pad_off(pad),
+				  -pad_y_off,
+				  pad_width,
+				  pad_height,
+				  clearance * 2, pad_width + mask,
+				  sprintf("%d", pad + 1),
+				  sprintf("%d", pad + 1), "square");
 	
 	/* top side (8-5) */
 
-	pad_mm(pad_off(pad),
-	       pad_y_off,
-	       pad_width,
-	       pad_height,
-	       sprintf("%d", 8 - pad),
-	       sprintf("%d", 8 - pad));
+	pad_mm_clear_mask_options(pad_off(pad),
+				  pad_y_off,
+				  pad_width,
+				  pad_height,
+				  clearance * 2, pad_width + mask,
+				  sprintf("%d", 8 - pad),
+				  sprintf("%d", 8 - pad), "square");
 	
 }
 
diff --git a/symbols/ti/drv8837.sym b/symbols/ti/drv8837.sym
index 281d5e0..c6f8f43 100644
--- a/symbols/ti/drv8837.sym
+++ b/symbols/ti/drv8837.sym
@@ -69,7 +69,7 @@ B 300 300 1800 2900 3 0 0 0 -1 -1 0 -1 -1 -1 -1 -1
 T 755 1700 8 10 1 1 0 0 1
 device=DRV8837
 T -5 -5 8 10 0 1 0 0 1
-footprint=tfsoj-8
+footprint=s-pwson-n8
 T 295 3295 8 10 1 1 0 0 1
 refdes=U?
 P 1600 3500 1600 3200 1 0 0