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Http://www.st.com/resource/en/datasheet/stm32l151cc.pdf WLCSP-64, 8x8 raster, 3.347x3.585mm package, pitch 0.5mm; see section 7.5 of http://www.st.com/resource/en/datasheet/DM00257211.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.

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