User Guide

Table Of Contents
Begin by placing 5 SMDs at a distance of 1,27 mm from each other in
two horizontal rows close to the coordinate origin. Since the value 0.8 x
2.0 is not contained in the SMD menu, this must be entered as 0.8 2.0,
either on the command line or in the SMD box on the parameter tool
-
bar.
ClickthereforeintheSMDicon,andtype
0.82
on the command line. Create two vertical rows as well. The SMDs can
berotatedin90degreeincrementswiththerightmousebutton.
PlacingtheSMDs
The Roundness parameter (CHANGE command) specifies whether
curves should be given to the corners of the solder pads. The default
valueis0%,whichmeansthatthereisnorounding.
Seealsothesectiononpage 103.
If a square SMD is selected, and if Roundness is defined as 100%, the re
-
sult is a round SMD, as is needed when creating ball grid array housings
(BGA). Roundness is usually chosen to be 0% when a package is being
defined. A general value can be specified in the Design Rules if slightly
roundedsolderpadsarepreferred.
Drag the 4 SMD rows into the correct position. Therfore use the finer
alternative grid of 0.05 mm by pressing the Alt key. The commands
GROUP and MOVE, followed by a right mouse click on the marked
group can be used to drag the marked group into the correct position.
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ComponentDesignExplainedthroughExamples