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DRC Rule minimum copper width

mf_ibfeew

Hello,

In the design rules I can define rules for minimum trace width. this works well for standard traces.

But the appended picture shows a problem with a minimum copper width in a special case. The net connects to the pad only with a very small edge, but none of the design-rules catches this event. Neither  the "unrouted" nor the "minimum trackwidth" - rules are complaining at this picture. Is there a rule which marks this picture as failure? How can I avoid such a situation? (the production of this board could easily produce an error at this point, it was pure luck that I catched this glitch)

Nice weekend, Maik Freitag

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  • Hi,

     

    The rules are similar to the Altium Designer rules for width.  I found them for AD18 as described here: https://www.altium.com/documentation/altium-designer/pcb-dlg-maxminwidthrule-framewidth-ad?version=18.1

     

    Did you try the selection for physical connected copper?  I'm not sure but otherwise I think it only checks the routing meets the expected rules and would not catch what you noted.

    image

     

    Darn, you got me curious and now I'm going to have to try this myself.

  • in reply to tarribred61

    I confirmed that for CS1.5.2 using the width rule with the check box set for physically connected copper that it caught the condition I artificially made for a small connection area. It did this using both batch and on-line DRC.

    Screen shot below shows what I see for detecting a copper connection less than the rule of 10mil.

    image

  • in reply to tarribred61

    Thanks for your effort.

    At  first I have to admit that until now I have overlooked and ignored the 4 checkboxes to the right of the min/max-sketch.

    The "check for physically connected copper" improves the situation and detects at least problems if 2 wires don't overlap properly. (middle of my picture, top half).

    The insufficient connection from wire to pad (bottom of the picture) is still not flagged as an error.

    I have now tried to play with another design (to exclude project-specific failures), but same behavior.image

    rule settings (now with the found physical-copper-switch set):

    image

    Can you upload a picture from your small-connect-test?

    Maik

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  • in reply to tarribred61

    Thanks for your effort.

    At  first I have to admit that until now I have overlooked and ignored the 4 checkboxes to the right of the min/max-sketch.

    The "check for physically connected copper" improves the situation and detects at least problems if 2 wires don't overlap properly. (middle of my picture, top half).

    The insufficient connection from wire to pad (bottom of the picture) is still not flagged as an error.

    I have now tried to play with another design (to exclude project-specific failures), but same behavior.image

    rule settings (now with the found physical-copper-switch set):

    image

    Can you upload a picture from your small-connect-test?

    Maik

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