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<html>
<head>
<title>EAGLE Help: SMD</title>
</head>
<body bgcolor=white>
<font face=Helvetica,Arial>
<hr>
<i>EAGLE Help</i>
<h1><center>SMD</center></h1>
<hr>
<dl>
<dt>
<b>Function</b>
<dd>
Adds smd pads to a package.
<p>
<dt>
<b>Syntax</b>
<dd>
<tt>SMD [x_width y_width] [-roundness] [orientation] [flags] ['name'] *..</tt>
<p>
<dt>
<b>Mouse</b>
<dd>
Center button changes the layer.<br>
Right button rotates the smd pad.
<p>
</dl>
<b>See also</b> <a href=67.htm>PAD</a>,
<a href=32.htm>CHANGE</a>,
<a href=62.htm>NAME</a>,
<a href=83.htm>ROUTE</a>,
<a href=127.htm>Design Rules</a>
<p>
The SMD command is used to add pads for surface mount devices to a
package. When the SMD command is active, an smd symbol is attached
to the cursor. Pressing the left mouse button places an smd pad at
the current position.
Entering numbers changes the x- and y-width of the smd pad, which
can be up to 0.51602 inch (13.1 mm). These parameters
remain as defaults for succeeding SMD commands and can be changed
with the CHANGE command. Pressing
the center mouse button changes the layer onto which the smd pad will be drawn.
<p>
The <tt>orientation</tt> (see description in <a href=26.htm>ADD</a>)
may be any angle in the range <tt>R0</tt>...<tt>R359.9</tt>. The <tt>S</tt>
and <tt>M</tt> flags can't be used here.
<p>
<b>Roundness</b>
<p>
The <tt>roundness</tt> has to be entered as an integer number between
<tt>0</tt> and <tt>100</tt>, with a negative sign to distinguish it
from the width parameters. A value of <tt>0</tt> results in fully
rectangular smds, while a value of <tt>100</tt> makes the corners
of the smd fully round. The command
<pre>
SMD 50 50 -100 '1' *
</pre>
for example would create a completely round smd named '1' at the given
mouseclick position. This can be used to create BGA (Ball Grid Array) pads.
<p>
<b>Names</b>
<p>
SMD names are generated automatically and may be modified with the
NAME command. Names may be included
in the SMD command if enclosed in single quotes.
<p>
<b>Flags</b>
<p>
The following <i>flags</i> can be used to control the appearance of an smd:
<p>
<table>
<tr><td valign=top><font face=Helvetica,Arial><tt>NOSTOP</tt> </font></td><td valign=top><font face=Helvetica,Arial>don't generate solder stop mask</font></td></tr>
<tr><td valign=top><font face=Helvetica,Arial><tt>NOTHERMALS</tt> </font></td><td valign=top><font face=Helvetica,Arial>don't generate thermals</font></td></tr>
<tr><td valign=top><font face=Helvetica,Arial><tt>NOCREAM</tt> </font></td><td valign=top><font face=Helvetica,Arial>don't generate cream mask</font></td></tr>
</table>
<p>
By default an smd automatically generates solder stop mask, cream mask and thermals as necessary.
However, in special cases it may be desirable to have particular smds not do this.
The above <tt>NO...</tt> flags can be used to suppress these features.<br>
A newly started SMD command resets all flags to their defaults. Once a flag is given
in the command line, it applies to all following smds placed within this SMD command.
<p>
<b>Single Smds</b>
<p>
Single smd pads in boards can only be used by defining
a package with one smd.
<p>
<b>Alter Package</b>
<p>
It is not possible to add or delete smds in packages which
are already used by a device, because this would change the pin/smd
allocation defined with the CONNECT command.
<hr>
<table width=100% cellspacing=0 border=0><tr><td align=left><font face=Helvetica,Arial>
<a href=index.htm>Index</a>
</font></td><td align=right><font face=Helvetica,Arial size=-1>
<i>Copyright © 2005 CadSoft Computer GmbH</i>
</font></td></tr></table>
<hr>
</font>
</body>
</html>
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