EFM32WG890 Datasheet, PDF (72/85 Pages) Silicon Laboratories – Operation from backup battery when main power drains out

...the world's most energy friendly microcontrollers
The BGA112 Package uses SAC105 solderballs.
All EFM32 packages are RoHS compliant and free of Bromine (Br) and Antimony (Sb).
For additional Quality and Environmental information, please see:
http://www.silabs.com/support/quality/pages/default.aspx
2014-06-13 - EFM32WG890FXX - d0198_Rev1.40
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