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Http://www.st.com/resource/en/datasheet/stm32f401vc.pdf WLCSP-49, 7x7 raster, 3.277x3.109mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UFBGA-15, 4x4, 3x3mm package, pitch 0.4mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f103ze.pdf Lattice caBGA-381 footprint for ECP5 FPGAs, based on the wrong side of D35, but other options exist. Single-step button (SW13) isn't producing a high enough voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a wire. Assembly Notes: More notes 812d609d12a788e600a582b2b6e7494f6d2b0728

(https://docs.broadcom.com/docs/AV02-0169EN SOIC 1.27 16 12.
MKDS-1,5-4 pitch 5mm size 20x10.5mm^2 drill.
2.137466e+000 1.747200e+001 facet normal -1.108416e-15 -1.577818e-15 -1.000000e+00 facet.
Normal -0.0969771 0.989359 0.108462 facet normal.

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