EFM32WG990 Datasheet, PDF (77/85 Pages) List of Unclassifed Manufacturers – The EFM32 MCUs are the world’s most energy friendly microcontrollers.

7 Revision History
...the world's most energy friendly microcontrollers
7.1 Revision 1.40
June 13th, 2014
Removed "Preliminary" markings.
Corrected single power supply voltage minimum value from 1.85V to 1.98V.
Added AUXHFRCO to blockdiagram and electrical characteristics.
Updated current consumption data.
Updated transition between energy modes data.
Updated power management data.
Updated GPIO data.
Updated LFRCO, HFRCO and ULFRCO data.
Updated ADC data.
Updated DAC data.
Updated OPAMP data.
Updated ACMP data.
Updated VCMP data.
Added EBI timing chapter.
7.2 Revision 1.31
November 21st, 2013
Updated figures.
Updated errata-link.
Updated chip marking.
Added link to Environmental and Quality information.
Re-added missing DAC-data.
7.3 Revision 1.30
September 30th, 2013
Added I2C characterization data.
Added SPI characterization data.
Corrected the DAC and OPAMP2 pin sharing information in the Alternate Functionality Pinout section.
Added the USB bootloader information.
2014-06-13 - EFM32WG990FXX - d0203_Rev1.40
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