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Section 6.6 of http://www.st.com/resource/en/datasheet/DM00273119.pdf X1-WLB0909, 0.89x0.89mm, 4 Ball, 2x2 Layout, 0.5mm Pitch, http://www.ti.com/lit/ds/symlink/ts3a24159.pdf Texas Instruments, BGA Microstar Junior, 5x5mm, 80 ball 9x9 grid, NSMD pad definition Appendix A BGA 196.

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