Polygon pour not connecting to power pins

Community PCB Design
1

I have a power plane that is not connecting to some of my pins. It is a part I downloaded from the Cadsoft website for the STM32 LQFP144 package:

ftp://ftp.cadsoft.de/eagle/userfiles/li … qfp144.lbr

For some reason, the polygon pour will only connect on the sides of the pads. Here’s the problem (red arrows pointing to issues):

I thought perhaps it was the tStop, but if it was it wouldn’t connect on the sides either.

Any ideas?

2

Check that the polygon pour spacing/isolate is not larger than the space between pads.

–David Carne

3

busonerd:
Check that the polygon pour spacing/isolate is not larger than the space between pads.

Hmm, that didn't do anything.

I set both to the minimum (0.004mil for spacing and 0 for isolate) and it still generates the bumps with no connection on the ends.

4

I’ve seen the same on other footprints as well, one of them being my own created footprint. As a workaround, I just drew a wire on the copper layer from the pad to the polygon pour.

Stig

5

Aha!

I’ve not figured it out (with some help from another Eagle user I know). The pour will only connect when the line width used to generate the polygon is less than the pad width. I changed the line width on the polygons to .22mm (instead of the default 10mil), and it poured correctly. The new result:

Fixed!