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Date:	Fri, 12 Jun 2015 11:36:53 -0400
Message-ID:	<CA+uY=MTbF9im-DxJq2n+C3zE=p5FyLohUZ6bmtuCSm85BQi10w@mail.gmail.com>
Subject:	Re: [geda-user] Parts with internally connected pins
From:	"Russell Nelson (russnelson AT gmail DOT com)" <geda-user AT delorie DOT com>
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The problem there is that you could have an "any pin" relationship (as in
your example), or an "all pins" relationship as in this example: the 75441
quad H-bridge has four ground pins which are also heat sinks, and which all
should be connected to a nice fat ground plane. AFAIK, gschem/pcb has no
way to express that relationship.

On Fri, Jun 12, 2015 at 11:17 AM, Donald Tillman <don AT till DOT com> wrote:

> Hi,
>
> What would be the best way to deal with parts that have pins that are
> internally connected together, and when laying out a board you can freely
> connect to one, or to the other, or both?  And do it in such a way that the
> pcb Optimize Rats Nest command doesn't complain.
>
> My specific case is the Bourns PTV09 vertically mounted pot.  Besides the
> usual three pins, there are two pins connected to a shield.  They're the
> same piece of metal so it's only necessary to connect to one of them, it
> doesn't matter which one.
>
> I tried a footprint file with the two shield pins with different names but
> the same number, but the rats nest demands a connection between them.
>
>   -- Don
>
> --
> Don Tillman
> Palo Alto, California
> don AT till DOT com
> http://www.till.com
>
>
>
>
>
>

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<div dir=3D"ltr">The problem there is that you could have an &quot;any pin&=
quot; relationship (as in your example), or an &quot;all pins&quot; relatio=
nship as in this example: the 75441 quad H-bridge has four ground pins whic=
h are also heat sinks, and which all should be connected to a nice fat grou=
nd plane. AFAIK, gschem/pcb has no way to express that relationship.</div><=
div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Fri, Jun 12, 20=
15 at 11:17 AM, Donald Tillman <span dir=3D"ltr">&lt;<a href=3D"mailto:don@=
till.com" target=3D"_blank">don AT till DOT com</a>&gt;</span> wrote:<br><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex">Hi,<br>
<br>
What would be the best way to deal with parts that have pins that are inter=
nally connected together, and when laying out a board you can freely connec=
t to one, or to the other, or both?=C2=A0 And do it in such a way that the =
pcb Optimize Rats Nest command doesn&#39;t complain.<br>
<br>
My specific case is the Bourns PTV09 vertically mounted pot.=C2=A0 Besides =
the usual three pins, there are two pins connected to a shield.=C2=A0 They&=
#39;re the same piece of metal so it&#39;s only necessary to connect to one=
 of them, it doesn&#39;t matter which one.<br>
<br>
I tried a footprint file with the two shield pins with different names but =
the same number, but the rats nest demands a connection between them.<br>
<br>
=C2=A0 -- Don<br>
<br>
--<br>
Don Tillman<br>
Palo Alto, California<br>
<a href=3D"mailto:don AT till DOT com">don AT till DOT com</a><br>
<a href=3D"http://www.till.com" rel=3D"noreferrer" target=3D"_blank">http:/=
/www.till.com</a><br>
<br>
<br>
<br>
<br>
<br>
</blockquote></div><br></div>

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