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Cursed Footprints | ||
================= | ||
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||
Complicated footprints, such as this `QFN <https://www.vishay.com/docs/75921/sic437.pdf>`_ | ||
can sometimes be challenging to draw, so here are some tips and tricks | ||
to make your life easier. | ||
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||
Import the drawing | ||
------------------- | ||
|
||
Even though technical drawings are sometimes not to scale, there's a | ||
good chance that they are, so it's worth trying to convert the drawing | ||
to a bitmap image and import it using the "Place picture" tool. In this | ||
particular case, I had to slightly adjust the aspect ratio for the | ||
dimensions to be as specified in the drawing. While it's not | ||
recommended to eyeball coordinates based on a bitmap image, it's a good | ||
way to verify that one has correctly reproduced the drawing. | ||
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Converting polygon to pads | ||
-------------------------- | ||
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For pads that require custom polygonal padstacks, draw the copper layer | ||
as a polygon and then use the "Convert to Pad" tool to convert the | ||
polygon into a pad. | ||
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Snap to pad corners | ||
------------------- | ||
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Often times, dimensions are specified between pad corners rather than | ||
pad centers. To simplify measuring and setting the distance between pad | ||
corners, enable the "Snap to pad corners" option in the "View & | ||
Selection" menu. |
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