Silicon Labs, 32bit ARM Cortex M3, EFM32 Microcontroller, 48MHz, 256 kB Flash, 64-Pin QFN

The Silicon Labs EFM32LG series 64 pin microcontroller offers unmatched performance and ultra-low power consumption in both active and sleep modes. A 32-bit ARM CortexM3 processor making it perfect for battery-powered systems and systems with high-performance, low-energy requirements.

It performs ultra-low power operation
0.65 μA current in Stop (EM3), with brown-out detection and RAM retention
63 μA/MHz in EM1
211 μA/MHz in Run mode (EM0)
It has fast wake-up time of 2 μs
Hardware cryptography (AES)
32 kB of RAM used