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= trim($rel); Final work on PCB From 6f5ee76aea5e7cdfb79e86a703d20d48842d1955 Mon Sep 17 00:00:00 2001 Subject: [PATCH] Notes from debugging Notes from MK's PCB livestream Footprints: - avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals vias connect through the board, cross at 90° to minimize distance sliders: 2mm above panel (cutting it very close, would need to create cutouts around the top (mm) hole_dist_top = 2.5; // margins from edges h_margin = hole_dist_side + thickness; v_margin = hole_dist_top*2 + thickness; right_rib_x = width_mm - h_margin; col_left = thickness + 6 + tolerance; // rib + half a jack col_right = width_mm - col_right + tolerance*4; //three knobs plus space between two resistors Properly assign potentiometer pads and thermal vias; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f303r8.pdf WLCSP-49, 7x7 raster, 3.141x3.127mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32l152zd.pdf WLCSP-64, 8x8 raster, 3.141x3.127mm package, pitch 0.4mm; see section 48.2.4 of http://ww1.microchip.com/downloads/en/DeviceDoc/DS60001479B.pdf WLCSP-81, 9x9, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32g031y8.pdf ST WLCSP-20, ST die ID 471, 4.437x4.456mm, 100 Ball, 10x10 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32l4p5ve.pdf ST WLCSP-115, ST die ID 495, 4.4x4.38mm, 100 Ball, 10x10 Layout, 0.55mm Pitch, https://www.dialog-semiconductor.com/sites/default/files/da1469x_datasheet_3v1.pdf#page=740 VFBGA-100, 10x10, 7x7mm package, pitch 0.8mm; http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#p495 TFBGA-216, 15x15 raster, 10x10mm package, pitch 0.4mm; see section 7.1 of http://www.st.com/resource/en/datasheet/DM00213872.pdf WLCSP-64, 8x8 raster, 4.539x4.911mm package, pitch 0.4mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32f429ng.pdf WLCSP-143, 11x13 raster, 4.521x5.547mm package, pitch 0.4mm; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f301r8.pdf WLCSP-49, 7x7 raster, 2.999x3.185mm package, pitch 0.8mm TFBGA-121, 11x11 raster, 10x10mm package, pitch 0.8mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32f091vb.pdf WLCSP-64, 8x8 raster, 4.539x4.911mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UCBGA-81, 9x9 raster, 4.4084x3.7594mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f303r8.pdf WLCSP-49, 7x7 raster, 2.965x2.965mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32l476me.pdf WLCSP-81, 9x9 raster, 3.693x3.815mm package, pitch 0.8mm TFBGA-121, 11x11 raster, 10x10mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32f302vc.pdf WLCSP-100, 10x10 raster, 10x10mm package, pitch 0.8mm; see section 6.2 of http://www.st.com/resource/en/datasheet/stm32f746zg.pdf TFBGA-100, 10x10, 9x9mm package, pitch 0.4mm; see section 7.1 of.

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