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DRV8301 Power pad Via issue
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TPiroth 3 years ago
Sorry, my question probably sounds dumb... However, maybe someone might help me to solve my issue. I successfully created some simple projects with EasyEDA and JLCPCB. However, now I am trying to place a TI DRV8301 BLDC driver on a PCB. I was using the JLCPCB symbol that already has a ground/power/thermal pad as required. However, I cannot simply add vias for connection with a ground plate and head dissipation as suggested in the datasheet of the chip. Everytime when I try to place vias in the ground pad, the DRC check outputs that the clearance between the two objects (the via and the power pad) is lower than the design rule. In addition, I can place only one via at the center of the power pad. Thank you very much for any hint on how to solve this issue. Best, Tobias
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andyfierman 3 years ago
[https://easyeda.com/forum/topic/How-to-place-multiple-vias-in-a-PCB-footprint-a34cf68d58414138898a56de60abd8c1](https://easyeda.com/forum/topic/How-to-place-multiple-vias-in-a-PCB-footprint-a34cf68d58414138898a56de60abd8c1)
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EdHayes3 2 years ago
You need to add the same NET to the via and pad. Once they have the same NET, you shouldn't get errors. I believe some times Vias get the NET automatically, other times not. Best to just verify. Once a via is placed on the board layout, you can move it around without it snapping to the center.
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andyfierman 2 years ago
@EdHayes3, @TPiroth, This is true if you wish to add vias to a pad in a footprint after it has been placed but if you wish to create a footprint which has a pad with thermal or electrical resistance reducing "vias" in it so that they are always present whenever that footprint is placed, then the Footprint Editor only offers pads to be placed. These can be sized as vias and must be given the same pad number as the one they are being placed in. "Once a via is placed on the board layout, you can move it around without it snapping to the center." Well, you learn something new every day. Which doesn't quite make up for - in my case - the approximately 2.718 things I forget every day. I had just independently noticed this behaviour which I'm sure did not used to happen so I must have missed it in an update note... Thanks for pointing it out. :)
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