Hi Ted,
I saw parts with hidden supply pins get connected, but trouble is, there
are many ways to call pins, VDD, VCC, GND, VSS. And Eagle doesn't seem
to have a way to "alias" them together when they should be.
Did you notice the GND@1 and GND@2 convention? you might try the @
convention to tie your pins together.
Time for my question, I just finished routing my board (by hand!), and
I see that I have vias that somehow have the wrong hole size? They
show up on the design rules check. I have 12 mil signals and 24 mil
power traces. They need changed, but what's the spec?
Alan KM6VV
kilocycles wrote:
> I'm re-doing some components I previously created (in Eagle, but this
> probably applies to other CAD pacakages as well). The actual
> components, MiniCircuits SBL-1 RF passive mixers require several
> signal to be connectected externally. This is an 8 pin through hole
> device.
>
> Two of the pins are for discrete signals. Two other pins are for one
> signal, and four pins are ground. In Eagle, I've designated the
> ground pins as SUP (supply) and the other four as I/O. I would think
> there should be a way to tie the two I/O pins together in the symbol
> that are supposed to be connected together extenally, but I haven't
> run across any symbols that tie pins together. I have them tied
> pictorally in the Symbol drawing. Also, I'm not sure if pads can be
> tied together in the Eagle Package for the device. I can lay
> additional pads down that overlay and graphically link the ones
> defined for the pins, but they aren't logically connected when the
> Device is defined; they are just sort of lying there.
>
> Without tying the pins and pads together in the Symbol/Package/Device
> definition, I have to remember that the two signal pins have to be
> tied to the same external signal, and the four ground pins have to be
> tied to ground, and not leave one or more unconnected. It's not a
> real big deal, just a convenience.
>
> There is a note in the Eagle Help topic on pins that states if any pin
> are defined on the Symbol as SUP (implying GND signal)that these will
> be automatically connected to GND as a net if a Supply symbol is used
> on the schematic; for example +12V, I presume. That's something else
> that's news to me. I've used Supply many times, and I've yet to see
> any component automatically tie to GND.
>
> Any ideas?
>
> Ted
>