Added NX3225SA 16 MHz crystal (symbol and footprint)

- BOOKSHELF: data sheet of NDK NX3225SA 16 MHz, 15 ppm, 8 pF crystal
- AUTHORS, components/INFO, components/xtal-4.lib: copied Alvaro's
  tas4025a.lib over from gta02-core and gave it a more general name
- AUTHORS, modules/INFO, modules/xtal-4.fpd: added footprint for
  four-padded SMT crystals

AUTHORS

@@ -1,6 +1,7 @@
 Alvaro Lopes <alvieboy@alvie.com>
 
   components/mini_usb_b.lib
+  components/xtal-4.lib (originally tas4025a.lib)
 
 Rene Harder <rehar@saweb.de>
 
@@ -13,3 +14,4 @@ Werner Almesberger <werner@openmoko.org>
   modules/meander.fpd
   modules/qfn.fpd
   modules/stdpass.fpd
+  modules/xtal-4.fpg

BOOKSHELF

@@ -47,3 +47,14 @@ D: http://www.nxp.com/documents/outline_drawing/sot617-3_po.pdf
 
 N: atmel-qfn
 D: http://www.atmel.com/dyn/resources/prod_documents/doc8583.pdf
+
+# NDK NX3225SA OA/AV/SRW crystals
+N: nx3225sa
+A: xtal
+D: http://www.ndk.com/images/products/catalog/c_NX3225SA-STD-CSR-3_e.pdf
+#
+# Digi-Key's version:
+#D: http://media.digikey.com/pdf/Data Sheets/NDK PDFs/NX3225SA.pdf?cshift_ck=null&client_id=5042&cshift_ck=null&client_id=5042
+#
+
+

components/INFO

@@ -14,3 +14,8 @@ S: mini_usb_b
 
 # Atmel AT86RF230 2.4 GHz Transceiver for IEEE 802.15.4
 S: at86rf230
+
+# Fairly generic crystal package with 4 pins (crystal connects pins 1 and 3,
+# the rest is ground)
+S: xtal-4
+N: nx3225sa

components/xtal-4.lib

@@ -0,0 +1,22 @@
+EESchema-LIBRARY Version 2.3  Date: Sat 23 May 2009 17:54:59 WEST
+#
+# TAS4025A
+#
+DEF TAS4025A X 0 40 Y N 1 F N
+F0 "X" 0 350 60 H V C CNN
+F1 "TAS4025A" 0 250 60 H V C CNN
+DRAW
+S -50 150 50 -150 0 1 10 N
+P 3 0 1 0  100 0  250 0  250 0 N
+P 3 0 1 10  100 150  100 -150  100 -150 N
+P 3 0 1 10  -100 150  -100 -150  -100 -150 N
+P 2 0 1 0  -100 0  -250 0 N
+S -250 200 250 -200 0 1 0 N
+X XT2 3 450 0 200 L 50 50 1 1 P
+X XT1 1 -450 0 200 R 50 50 1 1 P
+X LGND1 2 -150 -400 200 U 50 50 1 1 W
+X LGND2 4 150 -400 200 U 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+#End Library

modules/INFO

@@ -36,3 +36,8 @@ F: qfn
 #   everything
 #
 N: sot617-3-lp
+
+# Common 4-pin crystal SMT package (pins 1 and 4 are on a short side, pin
+# numbering is counter-clockwise)
+F: xtal-4
+N: nx3225sa

modules/xtal-4.fpd

@@ -0,0 +1,49 @@
+/* MACHINE-GENERATED ! */
+
+frame pad {
+	__0: vec @(Px/2, Py/2)
+	__1: vec @(-Px/2, -Py/2)
+	pad "$pin" . __0
+}
+
+frame pads {
+	table
+	    { pin, dx, dy }
+	    { 1, -1, -1 }
+	    { 2, 1, -1 }
+	    { 3, 1, 1 }
+	    { 4, -1, 1 }
+
+	__0: vec @(dx*Gx/2, dy*Gy/2)
+	frame pad .
+}
+
+frame outline {
+	table
+	    { px, py, x, y }
+	    { 0mm, Dy/2, Gx-Px-2*w, 0mm }
+	    { 0mm, -Dy/2, Gx-Px-2*w, 0mm }
+	    { -Dx/2, 0mm, 0mm, Gy-Py-2*w }
+	    { Dx/2, 0mm, 0mm, Gy-Py-2*w }
+
+	__0: vec @(px, py)
+	__1: vec .(x/2, y/2)
+	__2: vec __0(-x/2, -y/2)
+	line . __1 w
+}
+
+package "xtal-4-${Dx}x${Dy}"
+unit mm
+
+table
+    { Dx, Dy, Gx, Gy, Px, Py }
+    { 3.2mm, 2.5mm, 2.2mm, 1.6mm, 1.4mm, 1.2mm }
+
+set w = 5mil
+
+frame pads @
+frame outline @
+measx pads.__0 -> pads.__0 1mm+Py/2+Gy
+measy pads.__0 -> pads.__0 -1mm-Px/2-Gx
+measy pad.__1 -> pad.__0 1mm
+measx pad.__1 -> pad.__0 -1mm