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'[EE] EAGLE question: device w/ pads on top and bot'
2010\03\12@165158 by Vitaliy

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I'm sure it's been asked (and answered before), but I cannot come up with
the right search terms or whether what we're trying to do, is even possible.

Imagine that you have a metal clip that clips to the edge of a PCB. Since
it's metal, it connects both pads (top and bottom), so there is no need to
connect the two pads on the PCB: they are guaranteed to be one signal when
the clip is installed.

So, how do you create a device for this clip? You can give the same name to
multiple pins (GND@1, GND@2, etc) but what if you have two pads, but want
the symbol to only show one pin? And, you need EAGLE to know that once you
connect a signal to the top pad, the bottom pad gets connected
automatically?

Are there devices in the standard library, that exhibit this behavior?

Vitaliy

2010\03\12@170730 by M.L.

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On Fri, Mar 12, 2010 at 4:51 PM, Vitaliy <spam_OUTpiclistTakeThisOuTspammaksimov.org> wrote:
> I'm sure it's been asked (and answered before), but I cannot come up with
> the right search terms or whether what we're trying to do, is even possible.
>
> Imagine that you have a metal clip that clips to the edge of a PCB. Since
> it's metal, it connects both pads (top and bottom), so there is no need to
> connect the two pads on the PCB: they are guaranteed to be one signal when
> the clip is installed.
>
> So, how do you create a device for this clip? You can give the same name to
> multiple pins (GND@1, GND@2, etc) but what if you have two pads, but want
> the symbol to only show one pin? And, you need EAGLE to know that once you
> connect a signal to the top pad, the bottom pad gets connected
> automatically?
>
> Are there devices in the standard library, that exhibit this behavior?
>
> Vitaliy
>

I'm pretty sure there's no way to have two pins in a schematic
connected to one pad/pin on a board without violating DRC. I.e. you
could force a connection by drawing a wire on the physical part model
but it will give you hell when you do a DRC.

--
Martin K.

2010\03\12@171755 by Wouter van Ooijen

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> Are there devices in the standard library, that exhibit this behavior?

Dunno, but I guess an out-of-bounds copper trace would be a perfect
representation. Might generate some DRCs :(

--

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu

2010\03\12@172721 by Vitaliy

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"M.L." wrote:
> I'm pretty sure there's no way to have two pins in a schematic
> connected to one pad/pin on a board without violating DRC. I.e. you
> could force a connection by drawing a wire on the physical part model
> but it will give you hell when you do a DRC.

No, actually I'm trying to connect ONE schematic pin connect to TWO pads.

The metal clip, remember? It's one part, one signal, but it connects to two
pads on the edge of the PCB (top and bottom).

Vitaliy

2010\03\12@174142 by M.L.

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On Fri, Mar 12, 2010 at 5:26 PM, Vitaliy <.....piclistKILLspamspam@spam@maksimov.org> wrote:
> "M.L." wrote:
>> I'm pretty sure there's no way to have two pins in a schematic
>> connected to one pad/pin on a board without violating DRC. I.e. you
>> could force a connection by drawing a wire on the physical part model
>> but it will give you hell when you do a DRC.
>
> No, actually I'm trying to connect ONE schematic pin connect to TWO pads.
>
> The metal clip, remember? It's one part, one signal, but it connects to two
> pads on the edge of the PCB (top and bottom).
>
> Vitaliy


I realized that after I sent it, but the same applies. Pins and pads
are 1 for 1.

--
Martin K.

2010\03\12@175851 by Vitaliy

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M.L. wrote:
> I realized that after I sent it, but the same applies. Pins and pads
> are 1 for 1.

I found a part (F09VPS) in con-subd that uses a hack to combine two "G" pins
into one on the schematic. Doesn't really solve the problem.

These threads seem to confirm what you said:

forum.sparkfun.com/viewtopic.php?t=9294&sid=c736fb26b69940b359c6e3494a60a753
http://forum.sparkfun.com/viewtopic.php?t=7079

Sucks.

Vitaliy

2010\03\12@180753 by PICdude

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Two possibilities I can think of...
(1) Add a second pad using a polygon rectangle.  IIRC you can't name a  
polygon in the library editor, but you'll have a pad that you can  
solder on.  This will not allow the signal to pass through to the  
other side though.

(2) You can use 2 pins and put them at the same spot.  But IIRC once  
you add the part to the PCB, you need to move the part, then it will  
recognise them as being at the same spot and automatically connect  
them.  Experiment to be sure.

Cheers,
-Neil.



Quoting Vitaliy <piclistspamKILLspammaksimov.org>:

{Quote hidden}

> -

2010\03\12@200856 by Dwayne Reid

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Can you put a via through the pads?  Might also have the benefit of
adding strength.

dwayne


At 02:51 PM 3/12/2010, Vitaliy wrote:

{Quote hidden}

--
Dwayne Reid   <.....dwaynerKILLspamspam.....planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
http://www.trinity-electronics.com
Custom Electronics Design and Manufacturing

2010\03\13@112634 by Per Linne

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Wouldn't it be possible to design a component with one
(or several for that matter) normal rectangular through
hole pads, with a drill diameter of 0. It is definitely possible
in my "Number One Easy-PC".

PerL

{Original Message removed}

2010\03\15@052647 by Alan B Pearce

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> Imagine that you have a metal clip that clips to the edge of a PCB. Since
> it's metal, it connects both pads (top and bottom), so there is no need to
> connect the two pads on the PCB: they are guaranteed to be one signal when
> the clip is installed.

I guess this is a battery clip or similar.

I know that in Allegro, the way around this is to make the second pin a
mechanical pad. Is that option available in Eagle?

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