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Polygon not connecting to Pad

dbemmann

Strangely the pads of my component are not connecting to polygons of the same net. Why?

 

The component (J2 on the screenshot) is a self-designed solder-jumper defined as a net tie. On this PCB I want to use it to connect two ground planes (polygons with nets GND and AGND). As you can see, CircuitStudio doesn't connect the pads to the polygons.

 

Both polygons are set to "pour over all same net objects". I have two design rules for "polygon connect style":

Priority 1: first object = via, second object = all, connect style = direct connect

Priority 2: first object = all, second object = all, connect style = relief

 

You can both of them working on the other pads, but strangely not on the solder-jumper. On the other hand, these fine unrouted lines show that it should be connected. What am I doing wrong? Just for completeness, the component is built with 4 pads (two rounded ones overlapped by two rectangular ones). In any case there is enough room for relief lines.

image

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  • 0

    A little update on this: I tried what happens when I remove the connecting track between the pads (in the component). Interestingly, then the pads connect to the polygons with relief, just as expected. But that's not a solution since the component is no longer a Net Tie now, and I cannot place that connecting track in the PCB editor either.

  • 0 in reply to dbemmann

    Ah, my net-tie footprints are just two rectangular pads which overlap slightly and that works.

    Having two pads with connecting track or fill, as I think you have, doesn't work.

     

    Don't think that gotcha is anywhere in the documentation!

  • 0 in reply to voltsandjolts

    I was not able to solve it. I tried unpouring and then placing tracks. That works, but still there is no connection between polygon and pad (other than the track). I tried removing the bridge track in the footprint and replacing it with a narrow pad. This doesn't solve it either. Having only two pads could maybe work, but there is no available pad geometry to make a usable solder jumper out of two pads (i.e. one that can easily be re-closed by soldering after the bridge has been cut).

     

    My workaround for now is to connect to the polygons with tracks. I'm not that happy because unless I connect these tracks to another object, CS tends to remove them sometimes.

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  • 0 in reply to voltsandjolts

    I was not able to solve it. I tried unpouring and then placing tracks. That works, but still there is no connection between polygon and pad (other than the track). I tried removing the bridge track in the footprint and replacing it with a narrow pad. This doesn't solve it either. Having only two pads could maybe work, but there is no available pad geometry to make a usable solder jumper out of two pads (i.e. one that can easily be re-closed by soldering after the bridge has been cut).

     

    My workaround for now is to connect to the polygons with tracks. I'm not that happy because unless I connect these tracks to another object, CS tends to remove them sometimes.

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  • 0 in reply to dbemmann

    OK, I think you want a net-tie footprint that leaves the option of cutting the net-tie (for measuring current perhaps) and using a solder bridge repair.

    My preference for that is to use two seperate footprints.

    I have test points on each net which are large enough for soldering wires (current measurement) or a link (repair).

    The net-tie is a seperate footprint (just two overlapping pads) which can be cut.

    Overlay the net-tie and jumper if you like, with appropriate rule to ignore collision.

     

    image