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EAGLE User Support (English) Routing Issues
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Related

Routing Issues

Former Member
Former Member over 12 years ago

I have a project where I'm using an LPC1754FBD80,551LPC1754FBD80,551 in a LQFN-80 package and a CC2400 in a QFN48 package.  The LPC came from the lpc1xxx-v6 library downloaded from the EagleCAD website.  The other one I created based on another library which has the part already created.  After I added the connections for the ground pins and I looked at the board, this is what I saw:

 

image

 

So that's a ground layer with the two ICs side by side.  You can see the pins that are supposed to be connected to ground.  What I don't understand is why Eagle shows me unrouted nets connecting the ground pins together.  For the LPC1754FBD80,551LPC1754FBD80,551, the pins are clearly connected to the ground layer, so why the unrouted net?  On the CC2400 however, the exposed pad isn't connected to ground at all (even though it is in the schematic), so I can at least understand why it's showing me the unrouted net there.  However I'm still scratching my head, why wouldn't Eagle connect it?  There is no Keepout or Restrict area around the exposed pad.  What's there is a tStop and tCream area right over the pad.

 

Can anyone explain what's happening here, and how do I fix it?

 

Thanks!

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  • Former Member
    0 Former Member over 12 years ago

    Bumping, hoping for an answer.

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  • Former Member
    0 Former Member over 12 years ago

    Il 13/11/2012 16:32, kirash4 ha scritto:

    I have a project where I'm using an LPC1754FBD80,551LPC1754FBD80,551 in a LQFN-80 package and a CC2400 in a QFN48 package.  The LPC came from the lpc1xxx-v6 library downloaded from the EagleCAD website.  The other one I created based on another library which has the part already created.  After I added the connections for the ground pins and I looked at the board, this is what I saw:

     

      Image:GND Routing.png

     

     

    I cannot see the image. Are you sure you attached it? You also can

    upload it to a free hosting site.

     

    Marco

     

     

     

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  • igalloway
    0 igalloway over 12 years ago in reply to Former Member

    U$3 clearly has no ground connection to the center.

    Is the center specified in the library as a PAD, or is it a fill?

     

    If it's a fill, then you may either have to:

    - Adjust (make smaller) your clearance values

    - Agjust your polygon fill parameters

    - just run a trace into the pad

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  • Former Member
    0 Former Member over 12 years ago in reply to igalloway

    It's a PAD and it is connected to ground in the schematic.  Since I didn't make this library or part, I guess I'll have to figure out what's going on with the keepOut and restrict layers as, at first glance, they appear to be correct.  On the individual pins, it's right over the pad, with no bleed.  And on the center pad, it's slightly smaller than the pad itself.

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