EFM32WG Datasheet, PDF (1/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

...the world's most energy friendly microcontrollers
EFM32WG Reference Manual
Wonder Gecko Series
Preliminary
• 32-bit ARM Cortex-M4 processor running at up to 48
• Up to 256 kB Flash and 32 kB RAM memory
• Energy efficient and autonomous peripherals
• Ultra low power Energy Modes with sub-µA operation
• Fast wake-up time of only 2 µs
The EFM32WG microcontroller series revolutionizes the 8- to 32-bit market with a
combination of unmatched performance, and ultra low power consumption in both
active- and sleep modes. EFM32WG devices consume as little as 230 µA/MHz in run
mode.
EFM32WG's low energy consumption outperforms any other available 8-, 16-,
and 32-bit solution. The EFM32WG includes autonomous and energy efficient
peripherals, high overall chip- and analog integration, and the performance of the
industry standard 32-bit ARM Cortex-M4 processor.