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Http://www.st.com/resource/en/datasheet/stm32l152zc.pdf WLCSP-64, 8x8 raster, 3.347x3.585mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/DM00257211.pdf WLCSP-49, 7x7 raster, 3.029x3.029mm package, pitch 0.4mm pad, based on EPCOS app note 93 (https://www.catagle.com/45-2/PDF_AN93.htm.

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