Devices EFR32BG21 Series EFR32BG21A010 EFR32BG21A010 Silicon Labs Devices 3 EFR32BG21A010F1024IM32 EFR32BG21A010 Cortex-M33 EFR32BG21A010F512IM32 EFR32BG21A010 Cortex-M33 EFR32BG21A010F768IM32 EFR32BG21A010 Cortex-M33