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Pin Mapping

Former Member

The basics of pin mapping are simple and Eagle does it well. However this does not adequately address different needs that come up in the real world.

 

At least it's possible to not assign any pin to a pad.This takes care of situations where a part simply has physical pins that internally don't connect to anything.

 

Unfortunately the opposite is not possible. If I have a part that has either the one internal connection that can be physically accessed on multiple pins, I have to represent this in the symbol by multiple pins.

  • Dang, I have to learn not to use tab+enter when writing these... anyway, on it goes.

     

    This often ends up looking really messy. For example if a connection such as GND or an emitter is accessible through a tab on a SMD and as well through a pin, I would like to show the emitter just as in any normal transistor and still have both pads assigned, so that the layout editor knows they must/can be wired together, whithout me having to jump through hoops when editing the schematic.

     

    Right now I am trying to define a Mini-Circuits mixer. It has two pins that must be wired together. These will then represent the IF port. Having a mixer symbol with two pins as the IF port (and different names, because I can't have a pin name assigned twice) just makes my skin crawl. I would really like to just have one pin in the symbol and then map that to multiple pads. Peeeease...

     

    BTW I do know about the trick about placing the pins on top of each other in the symbol editor (first place them in different locateions, because Eagle does not allow them to placed on top of each other, then move them on top of each other). In that case any wire going to the pin location is automatically connected to all pins. That approach would be borderline ok if the Eagle would not also place a junction symbol there...

  • in reply to Former Member

    On 09/22/11 06:26, egrom wrote:

    Dang, I have to learn not to use tab+enter when writing these... anyway, on it goes.

     

    This often ends up looking really messy. For example if a connection such as GND or an emitter is accessible through a tab on a SMD and as well through a pin, I would like to show the emitter just as in any normal transistor and still have both pads assigned, so that the layout editor knows they must/can be wired together, whithout me having to jump through hoops when editing the schematic.

     

    Right now I am trying to define a Mini-Circuits mixer. It has two pins that must be wired together. These will then represent the IF port. Having a mixer symbol with two pins as the IF port (and different names, because I can't have a pin name assigned twice) just makes my skin crawl. I would really like to just have one pin in the symbol and then map that to multiple pads. Peeeease...

     

    Version 6 will be able to connect several pads to a single pin.

     

    Klaus Schmidinger

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