Electronics > Eagle

Ground plane not connecting with pin

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joegtp:
I tried asking this question over here: http://www.element14.com/community/message/44813#44813/l/ground-plane-not-connecting-with-pin but that forum seems to be a bit of a ghost town.

I'm trying to connect my ground to a LQFP-64 (10x10mm) but it doesn't seem to want to connect in Eagle 6.1.0. This used to work fine in 5.10.0. I have the polygon isolate set to 0. My DRC supply thermal isolation is set to 10mil. I've tried reducing the isolation but it still won't connect. Here is a screenshot of what I'm seeing.  If I route a wire from the pin to anywhere on the ground plane and then run DRC it works fine but this is kind of a pain.

See the attached image

Neganur:
Not sure I understood your problem: you don't like the ratnest-airwire still showing even though the plane is properly connected?

I had to use eagle in a recent joint venture university project. I ended up right-clicking the GND connection and hide all airwires for that signal.

senso:
Usually when I have those strange ground ratsnest in Eagle is because somewhere there is a break in the ground-plane, or between the top and bottom groundplane, yes Eagle is not very smart giving some indications.

joegtp:
@Neganur That is correct. The ground plane is connected correctly and it's still showing an airwire for that connection. If I create a small wire coming from the package out to the ground plane it connect correctly but that's a pain especially as you move the part around.

Turning off airwires for GND doesn't seem like a good idea to me. When running the ratsnest tool you loose the ability to tell when all the airwires are connected.

Write_to_Smokegenerator:
ohh that problem, i encountered it last week so many times, i'm still not quite sure what it is, but i had diffrent solutions, here are my thoughts:

Is the Ground plane really connected or is there a break so the entire area is not connected to the GND (had that problem a few times because i rerouted lines)?
Sometimes it does that because there is a little bit of an unrouted line left (f.e if you routed a line and moved it arround and after a few tries you deleted it, there can be a little line left and Eagle wants that line connected)
and finally sometimes i didn't come up with an explanation and it miracally solved itselve  ::)

Maybe this helps you a little
cheers

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