> On Jul 9, 2018, at 10:24 AM, Seth Hillbrand <s...@hillbrand.org> wrote: > > Hi Andy- > > In the footprint you mention, note that there are many paste-only pads (see > attached image). To follow Silicon Labs' recommendation, simply create your > exposed pad with no paste layer and add multiple paste-only pads in the > geometry you desire.
I must have pulled an older version of that footprint, as that one has the paste-mask cut-outs and the one I used didn't. I see how that works. No need for a pad number, just create a pad with no copper layer and only the paste-mask layer and place as many as needed. Perfect. > Note that there is a tutorial on the user forum > (https://forum.kicad.info/t/tutorial-how-to-make-a-footprint-from-scratch/11092/1) > that covers this. Thanks for the link — I had not seen that. > > -S > > Am Mo., 9. Juli 2018 um 10:00 Uhr schrieb Andy Peters <de...@latke.net>: > I followed the discussion about “new non-copper pad paste and mask > clearances,” hoping that it would suggest how to do something. Maybe I’m > missing it. > > I’m using a part in a QFN-44 package with the exposed pad. The library guys > have created this footprint in > https://kicad.github.io/footprints/Package_DFN_QFN and it’s the > QFN-44-1EP_7x7mm_P0.5mm_EP5.2x5.2mm guy. > > The recommendation from the chip vendor (Silicon Labs, but I’m sure it’s a > standard recommendation) is for solder paste stencil to have a “3x3 array of > 1.25 mm square openings on 1.80 mm pitch for the center ground pad.” The > library footprint doesn’t have this stencil stuff, it’s just one big open > area for solder paste. And I built a board with this footprint and now know > why the recommendation is for the smaller openings in the stencil. > > I figured this would be a good use of the “Custom Shape Primitives” feature > in the footprint editor. But I can’t figure out how I’m supposed to enter > anything into this dialog. The buttons are all grayed out. See: > > > > > This is with yesterday’s “testing” build. > > Am I missing something? Is this feature not yet implemented? > > Application: kicad > Version: (5.0.0-rc3-dev-5-gfd7f3b8), release build > Libraries: > wxWidgets 3.0.4 > libcurl/7.54.0 LibreSSL/2.0.20 zlib/1.2.11 nghttp2/1.24.0 > Platform: Mac OS X (Darwin 17.6.0 x86_64), 64 bit, Little endian, wxMac > Build Info: > wxWidgets: 3.0.4 (UTF-8,STL containers,compatible with 2.8) > Boost: 1.61.0 > OpenCASCADE Community Edition: 6.8.0 > Curl: 7.43.0 > Compiler: Clang 7.3.0 with C++ ABI 1002 > > Build settings: > USE_WX_GRAPHICS_CONTEXT=ON > USE_WX_OVERLAY=ON > KICAD_SCRIPTING=ON > KICAD_SCRIPTING_MODULES=ON > KICAD_SCRIPTING_WXPYTHON=ON > KICAD_SCRIPTING_ACTION_MENU=OFF > BUILD_GITHUB_PLUGIN=ON > KICAD_USE_OCE=ON > KICAD_USE_OCC=OFF > KICAD_SPICE=ON > _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
