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SW15 (once/stop) and cascade out is easier done via skywiring; only one tl074 and support components, so tiny PCB should be possible, too Manual trigger * See manual step button in Unseen Servant - a function of the potentiometer pads and thermal vias; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f103tb.pdf LFBGA-144, 12x12 raster, 7x7mm package, pitch 0.4mm; 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; see section 7.1 of http://www.st.com/resource/en/datasheet/DM00213872.pdf WLCSP-64, 8x8 raster, 3.357x3.657mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UCBGA-49, 7x7 raster, 2.965x2.965mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32f071v8.pdf WLCSP-63, 7x9 raster, 3.228x4.164mm package, pitch 0.4mm; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f051t8.pdf UFBGA-100, 12x12 raster, 7x7mm package, pitch.

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