EFM32WG990 Datasheet, PDF (73/80 Pages) List of Unclassifed Manufacturers – The EFM32 MCUs are the world’s most energy friendly microcontrollers.

Preliminary
7 Revision History
...the world's most energy friendly microcontrollers
7.1 Revision 1.10
May 6th, 2013
Updated current consumption table and figures in Electrical characteristics section.
Other minor corrections.
7.2 Revision 1.00
September 11th, 2012
Updated the HFRCO 1 MHz band typical value to 1.2 MHz.
Updated the HFRCO 7 MHz band typical value to 6.6 MHz.
Corrected BGA solder balls material from Sn96.5/Ag3/Cu0.5 to SAC105.
Other minor corrections.
7.3 Revision 0.95
May 3rd, 2012
Updated EM2/EM3 current consumption at 85°C.
7.4 Revision 0.90
February 27th, 2012
Initial preliminary release.
2013-05-06 - EFM32WG990FXX - d0203_Rev1.10
73
www.energymicro.com