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Date: Fri, 28 Jan 2022 09:33:17 +0100
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Subject: Re: [geda-help] geda pcb: footprint with non rectangular pads
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From: "Klaus Rudolph (lts-rudolph AT gmx DOT de) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
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Precedence: bulk

Hi Erich,

thanks for pointing me to the land patters from Microchip. Most of them
are simply rectangle and I can simply draw them. That makes, in the
moment, any further research unnecessary.

Thank you very much!
  Klaus


Am 27.01.22 um 11:02 schrieb Erich Heinzle (a1039181 AT gmail DOT com) [via
geda-help AT delorie DOT com]:
> There appears to be a range of recommended land patterns for the VQFN
> 20 3.0x3.0.0.9 mm Microchip ICs.
>
> https://www.microchip.com/en-us/support/package-drawings
>
> Some of them have rectangular pads.
>
> If you want to have arbitrary polygons in footprints, you may wish to
> implement the footprint in pcb-rnd, as it allows a polygons to be
> drawn and used as the copper shape in a custom padstack. You will not
> be able to successfully export the footprint to gEDA PCB as there is
> no internal support in gEDA PCB for polygonal SMD pads.
>
> Similarly, pcb-rnd allows custom polygons to be specified for the
> various apertures, i.e. soldermask, stencil, etc, or they can be
> autogenerated in the padstack property editor.
>
> translate2geda has to skip non rectangular or circular polygonal pads
> when converting to gEDA PCB because there is no easy way to draw the
> polygonal pad shapes.
>
> It is worth mentioning the tutorial
>
> http://www.penguin.cz/~utx/pstoedit-pcb/
>
> which shows conversion of pdf or postscript land patterns to gEDA PCB
> footprints using the pstoedit utility.
>
> As of version 3.76, pstoedit also supports export to pcb-rnd's native
> footprint format, allowing to export paths as well as polygons.
>
> http://www.calvina.de/pstoedit/changelog.htm
>
> Regards,
>
> Erich.
>
> On Thu, Jan 27, 2022 at 6:20 PM Klaus Rudolph (lts-rudolph AT gmx DOT de)
> [via geda-help AT delorie DOT com] <geda-help AT delorie DOT com> wrote:
>>
>> I want to create a board with a VQFN 20 package which has non
>> rectangular pads.
>>
>> A detailed drawing can be seen here:
>> https://ww1.microchip.com/downloads/en/DeviceDoc/ATtiny806_1606_Data_Sheet_40002029A.pdf
>> Section 34.2 20-Pin VQFN
>>
>> As you can see, the pads at the corner have a non rectangular shape.
>>
>> I read http://pcb.geda-project.org/pcb-cvs/pcb.html#Library-Creation
>> and there was mentioned:
>>
>> 10.2.1 Creating Newlib Footprints
>> "Currently a rectangle or polygon may not be used as a pad."
>>
>> Is there any chance to create a footprint for PCB for VQFN-20 as given
>> in the above linked data sheet with non rectangular pads?
>>
>> Thanks
>> Klaus
>>