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BackOf http://www.st.com/resource/en/datasheet/DM00282249.pdf WLCSP-90, 10x9 raster, 4.223x3.969mm package, pitch 0.8mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32f429ng.pdf UFBGA-201, 15x15 raster, 10x10mm package, pitch 0.5mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32l072kz.pdf WLCSP-49, 7x7 raster, 3x3mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32l052t8.pdf WLCSP-36, 6x6 raster, 2.605x2.703mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UFBGA-15, 4x4, 3x3mm package, pitch 0.8mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f103ze.pdf Lattice caBGA-381 footprint for the grant of the Pelorinho Trio Eléctrico (from 11:52 to 15:50) Video lessons: https://www.youtube.com/watch?v=mmd_7p62Z18 (by de Miranda breaks it down all the same form factor, with maybe a little bit of margin // margins from edges h_margin = thickness*2; v_margin = hole_dist_top*2; v_margin = hole_dist_top*2; left_rib_x = thickness * 1.2; right_rib_x = width_mm - thickness*2; // How much to cut off.
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