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Copper area issue for UFQFPN-20

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thepigs 6 years ago

**BUG** Concise problem statement: Copper area gets too close to pad for UFQFPN-20 I have created a bugreport project here: https://easyeda.com/thepigs/bugreport-5799cb0abe304425a5d199b3fd34eeaa Steps to reproduce bug: 1. Place an STM8S003F3U6 with footprint UFQFPN-20 into a schematic with 5V and GND 2. Generate PCB 3. Add +5V copper area to top Results: ![blue circle shows copper area 'tail' too close to pad][1] Expected results: copper area should stay away from pad Browser: Chrome [1]: /editor/20171128/5a1c7dd6c6173.png

Comments

andyfierman 6 years ago

There is something strange about this footprint. **SHIFT+F** searching for the UFQFPN-20 footprint in the library looks like this: ![enter image description here][1] However, the footprint imported into a PCB from placing a STM8S003F3U6 in a schematic (as described above) looks like this: ![enter image description here][2] * I do not know what the purple and grey areas are on pads 1, 5, 6, 10, 11, 15, 16 and 20. [1]: /editor/20171128/5a1c9d142b713.png [2]: /editor/20171128/5a1c9dda0e256.png

thepigs 6 years ago

Now if you open the shared project link from above the grey/purple areas have disappeared. Nothing was changed however. It is odd. Maybe one of the devs can explain it. Could be a footprint issue I guess.

thepigs 6 years ago

I worked out what the dark purple/grey items are: ![enter image description here][1] [1]: /editor/20171128/5a1ca883eac03.png Still probably a bug though??

Tutorials 6 years ago

Hi That is not a bug, when you clear PAD6 net and re-copper you can find ![enter image description here][1] If you ungroup the footprint, move the pad5 solid area to another area, and re-copper, you will see: ![enter image description here][2] What you see seems a bug that's because the solid area clearance cover the copper of PAD5, as the yellow circle marked. ![enter image description here][3] [1]: /editor/20171128/5a1d011d15a31.png [2]: /editor/20171128/5a1d019fc4268.png [3]: /editor/20171128/5a1d023bcb784.png

thepigs 6 years ago

Haha yes, obvious when you put it like that :) Thanks. I changed the UFQFPN-20 footprint to use polygonal pads instead of solid regions. And tweaked the clearance. Looks good now : ![enter image description here][1] [1]: /editor/20171128/5a1d3971b8e4c.png

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