X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=eUTY+iwuyKrs9A1w0qZEdMVrq4I+xSTSJQwRMF50JsY=; b=MR4c9JZem9mThCJW8S/QzcNLk68enTDJh8zHZ7QXfrhFMXHPgqKdHoRDhp5j5h7A5j GqX8LKHclSMmdob4AACevWiTg2IMESpwKFtJlK6o29b+3Go5NhD6lVGzr7W0x400TvLq +X4uD8a1VQjeePp1LultsSWmEPB/d9hq7Hme9MMFgeLhSFnYLkM7FcgxE7bkdHDVtO/c x5s9XZ6TjqwLbg9FWioMHpgWIgTD9YVzi6b2psGtoFaZEj/z+QpYEtSD+RcJA/Bif6Ly El8i7ZfJk8vmcCowVNqo8GUxNURmh/SKF4lQFw8m7J4ZALCgidcaKxVqPhbxeL6et6M3 0xwg== MIME-Version: 1.0 X-Received: by 10.50.43.227 with SMTP id z3mr5246266igl.22.1434123413443; Fri, 12 Jun 2015 08:36:53 -0700 (PDT) In-Reply-To: References: Date: Fri, 12 Jun 2015 11:36:53 -0400 Message-ID: Subject: Re: [geda-user] Parts with internally connected pins From: "Russell Nelson (russnelson AT gmail DOT com)" To: geda-user AT delorie DOT com Content-Type: multipart/alternative; boundary=089e0111c0169f5b5a051853e090 Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk --089e0111c0169f5b5a051853e090 Content-Type: text/plain; charset=UTF-8 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 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 > > > > > > --089e0111c0169f5b5a051853e090 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
The problem there is that you could have an "any pin&= quot; relationship (as in your example), or an "all pins" 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 class=3D"gmail_extra">
On Fri, Jun 12, 20= 15 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 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't complain.

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'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.

=C2=A0 -- Don

--
Don Tillman
Palo Alto, California
don AT till DOT com
http:/= /www.till.com






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