Silicon Labs EFR32FG22C121F512GM40-C, 32bit Wireless Microcontroller, EFR32FG22 Wireless Gecko SoC, 38.4MHz, 512 kB

The Silicon Labs EFR32FG22 series wireless Gecko SoC Family is ideal for enabling energy-friendly proprietary protocol networking for IoT devices. The single-die solution combines a 38.4MHz Cortex-M33, with a high performance 2.4GHz radio to provide an industry-leading wireless SoC for IoT connected applications.

Energy-efficient radio core with low active and sleep currents
38.4MHz Arm® Cortex®-M33 core with TrustZone and a high-performance radio with a receive sensitivity of -106.4 dBm
Secure boot with root of trust and secure loader (RTSL)