Silicon Labs EFM32WG940F256-B-QFN64, 32bit ARM Cortex M4 Microcontroller, EFM32, 48MHz, 256 kB Flash, 64-Pin QFN

The Silicon Labs EFM32WG series 64 pin microcontroller offers unmatched performance and ultra-low power consumption in both active and sleep modes. ARM Cortex-M4 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

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