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 Pad with chamfer on one corner only?
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Scazon

United Kingdom
62 Posts

Posted - 05 Jan 2019 :  14:07:38  Show Profile  Reply with Quote
The STM32F031GxU comes in a 20 pin UFQFN package. The corner pins are so close that a chamfer is needed on one corner only to achieve clearance. Chamfered pads cut off all 4 corners. I suppose I could overlay multiple pads to get the affect, but is there a direct way of achieving this shape?

Iain Wilkie

United Kingdom
948 Posts

Posted - 06 Jan 2019 :  09:12:08  Show Profile  Visit Iain Wilkie's Homepage  Reply with Quote
https://www.numberone.com/faq.aspx?KB020093
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Scazon

United Kingdom
62 Posts

Posted - 06 Jan 2019 :  10:53:14  Show Profile  Reply with Quote
Thanks.
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Scazon

United Kingdom
62 Posts

Posted - 06 Jan 2019 :  12:12:32  Show Profile  Reply with Quote
A snag or two: the shape solder mask isn't coming out on the plot (V22.0.3) - help says it's supposed to be added automatically but it isn't. It appears on the design if I add a solder mask layer, but not in the plot. And in the design, the shape is a different size from that in the component editor.
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Iain Wilkie

United Kingdom
948 Posts

Posted - 06 Jan 2019 :  15:29:43  Show Profile  Visit Iain Wilkie's Homepage  Reply with Quote
When you create the copper "shape" for the pad you need to tick the "Auto Mask" box.
Note that the paste and the resist masks for this pad will not show correctly within the PCB editor you should find they as as expected in the plots.

Iain

EDIT .... it seems this has been fixed in V22
Plotting - Auto Mask
The ability to automatically create mask (solder resist/paste) for Copper Shapes attached and
associated to pads in PCB Symbols has been extended to work on user-created mask layers in the
PCB (layers which use a layer type which has a defined over or under-size). Any shape defined on a
copper layer as part of a symbol will now create an appropriate under or oversized shape on an automask layer. Previously, the Auto Mask facility was only available for pads-only plots generated at the
Plotting stage.



Edited by - Iain Wilkie on 06 Jan 2019 15:40:48
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Scazon

United Kingdom
62 Posts

Posted - 06 Jan 2019 :  18:39:43  Show Profile  Reply with Quote
Sadly it doesn't seem to. When I look at the Gerbers created, the mask only includes the pads, not the shapes. I've packed the design off to Peter to see if he can see what I'm doing wrong.
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Iain Wilkie

United Kingdom
948 Posts

Posted - 06 Jan 2019 :  22:27:35  Show Profile  Visit Iain Wilkie's Homepage  Reply with Quote
Just looked at the V22 manual and it should work according to it.
I can try this tomorrow ..... however can you please let us know of Numberones response ?

Iain

EDIT ..... just tried this and it works .... but as explained above you only see the paste and resist ouputs correctly in the gerbers .... not in the PCB editor.

Iain

Edited by - Iain Wilkie on 07 Jan 2019 11:14:21
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Scazon

United Kingdom
62 Posts

Posted - 18 Jan 2019 :  10:16:22  Show Profile  Reply with Quote
What I missed is the tick box Auto mask in the PCB shape properties . With this ticked, the mask is applied automatically and there's no need for a separate shape on the mask layer, or an explicit mask layer at all. It also applies the oversize specified in the technology file. It might help if the default state of this box were to be ticked, but thank you once again Peter Johnson.

I don't know why my approach of adding a custom mask layer led to strange results, but in my case I needn't have worried.
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AndyB

United Kingdom
207 Posts

Posted - 15 Jul 2019 :  18:22:42  Show Profile  Reply with Quote
This seems to be another limitation of easy pc.
This should be a an easy thing to do.
Shapes as pads.
Not just square ,rectangle and circle.

When using a copper pour you have no way of adding this work around pad to a net.




Edited by - AndyB on 15 Jul 2019 18:33:44
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