How to create a SMD pushbutton device with 2 pins and 4 pads?

"Thomas Pircher" <tehpeh@gmx.net> wrote in message

news:og6n36-pdf.ln1@grummel.tty1.net...

Hi,

 

I'm relatively new to Eagle and HW design in general. I'm trying to create

a

symbol and package for a SMD push button.

 

The pushbutton symbol has 2 pins, while the package has 4 smd pads. Pads 1

and 2 are electrically connected, and so are pads 3 and 4. When I create

the Eagle device, then the number of pins and pads obviously don't match.

 

Now I could:

 

1) leave 2 pads in the package unconnected.

2) generate a symbol with 4 pins and leave 2 pins unconnected in the

schematic.

 

How can I tell Eagle that two pads are always connected together? It would

be nice if I had only two pins but could route to any of the equivalent

pads

and leave the other unconnected, but I cannot think of a way to accomplish

this. Is there a way to do so? Alternatively, what is the 'conventional'

way of handling this in Eagle?

 

Thanks,

Thomas

Hi Thomas,

the best way is to create a symbol with four pins and connect all of the to

the package. If you assign the direction "pas" == passive to them, it will

cause no DRC error if not all pins are connected. This way leaves you more

choices. You may come to the point where you want to use the unconnected

pins. Then you have to go the library again. Better first time right.

There is no way to tell eagle that pins are connected to each other. This

must be done in the schematic editor.

You may take a look at the switch.lbr there are some parts with internal

connected pins.

Regards,

Carsten

Carsten wrote:

Hi Thomas,

 

the best way is to create a symbol with four pins and connect all of the to

the package. If you assign the direction "pas" == passive to them, it will

cause no DRC error if not all pins are connected. This way leaves you more

choices. You may come to the point where you want to use the unconnected

pins. Then you have to go the library again. Better first time right.

 

There is no way to tell eagle that pins are connected to each other. This

must be done in the schematic editor.

 

You may take a look at the switch.lbr there are some parts with internal

connected pins.

 

Regards,

Carsten

 

 

I second this.

It also gives pissibility to use the switch as jumper.

For example I feed it the net +5V, and on the other side I name the net +5VB

Carsten wrote:

the best way is to create a symbol with four pins and connect all of the

to the package. If you assign the direction "pas" == passive to them, it

will cause no DRC error if not all pins are connected. This way leaves you

more choices.

Hi Carsten,

thanks for the quick reply. Your suggestion makes much sense, it gives the

most freedom of choice. Now I know also what "pas" stands for.

Cheers

Thomas