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Subject:	Re: [geda-user] How to define for an exposed pad to connect to 3
	pins/pads
To:	geda-user AT delorie DOT com
References:	<xnmuuy6a7j DOT fsf AT envy DOT delorie DOT com>
From:	"Dave McGuire (mcguire AT neurotica DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Message-ID:	<910e5ecd-24a2-fdb6-432a-0fa913cf3559@neurotica.com>
Date:	Tue, 10 Jul 2018 18:06:48 -0400
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On 07/10/2018 05:40 PM, DJ Delorie wrote:
> Typically you'd treat the exposed pad like any other pin/pad, give it a
> pinnumber (make one up) and expose it in the schematic symbol.
> 
> Then you'd connect all four grounds (AGND, DGND, PGND, EP) in the
> schematic, then in the layout.

  Ok.  That's an easy case, and that's what I've done for many things
like this.  But others, like components that use an existing footprint,
will require something different.

  For example, the specific thing that hit me this morning was a power
resistor in a DPAK package, whose pad is electrically isolated, but I
want to solder it down and connect it to the plane thermally.  In the
schematic, I use a standard resistor, which has two pins, 1 and 2.  The
DPAK PCB footprint has pin 3, which is what gave me trouble.

  There have been a few other replies to this which I've not yet gone
over, but I will tonight.

               -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

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