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Mail Archives: geda-user/2018/07/10/19:07:15

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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>
<910e5ecd-24a2-fdb6-432a-0fa913cf3559 AT neurotica DOT com>
<s6nk1q23elw DOT fsf AT blaulicht DOT dmz DOT brux>
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: <d199214f-e328-7b97-f93b-5832906bbb9f@neurotica.com>
Date: Tue, 10 Jul 2018 19:05:57 -0400
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On 07/10/2018 06:33 PM, Stephan Böttcher wrote:
>>   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.
> 
> The footprint has three pins, the schematic symbol only two.  Add a net=
> attribute to the symbol instance to tell where the third pin shall
> connect to
> 
>   net=GND:3
> 
> I've done exacly that with a voltage regulator in SOT223 package,
> 
>   net=out:4
> 
> to connect pins 2 and 4 (the pad).

  Oh my goodness.  Perfect and elegant.  Wow.  Thank you Stephan!

  (And, dammit, I know how attributes work, why didn't I think of that?!)

            -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA

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