Re: gEDA-user: Gschem/PCB: how to deal with "special" pins & pads?

[Dave N6NZ <n6nz@xxxxxxxx>]

On Jul 21, 2010, at 1:03 PM, Richard Rasker wrote:

> Hello,
> 
> I'm a happy GSchem + PCB user for quite a few years now, but I'm still
> puzzled about one aspect of defining symbols and footprints, and that is
> "special" pins and pads. With "special" I mean the following types of
> pins/pads:
> 
> - Internally connected pins and pads, e.g. SO8 MOSFETs with 
> S on pins 1-3, G on pin 4, and D on pins 5-8. I can of course create a
> GSchem symbol with 3 pins for S and 4 pins for D, but is there a more
> elegant way in GSchem to deal with this?

Well, I'm not saying this is more elegant, but it is different:  You can create a copy of the SO8 footprint where the S pins all have the same pin number, and the D pins all have the same pin number.  It keeps the gschem symbol looking 'normal'.

> 
> - So-called "don't care" pins and pads, e.g. mounting pads for SMD
> connectors. I found that I can at least connect these to each other when
> I give them all pin number 0 (zero), but I can't connect these to any
> net (e.g. Gnd) in the circuit without the DRC check crying foul. Is
> there a way to define these pads in such a way that PCB doesn't care to
> which net each one is connected?

In every case I've had in my own design so far, these pads are all connected to ground anyway, so I just give these pads the same pad number as the ground pin.

-dave


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