EFM32PG22 32-bit Microcontrollers Silicon Laboratories EFM32PG22 32-bit Microcontrollers are part of the Series 2 Gecko portfolio designed to enable energy-friendly embedded applications. The EFM32PG22 32-bit Microcontrollers are a highly efficient solution featuring a 76.8MHz Cortex-M33 with a high rich analogue and communication peripherals. The Silabs EFM32PG22 32-bit Microcontrollers provide industry-leading energy efficiency for consumer and industrial applications.