The 32-Bit EFM32PG22 from Silicon Labs is a Space Qualified Microcontroller with Clock Rate 40 to 76.8 MHz, Operating Frequency 76.8 MHz, Internal RAM Memory 32 kB, Flash Memory 512 kB, Supply Voltage 1.71 to 3.8 V. Tags: Surface Mount. More details for 32-Bit EFM32PG22 can be seen below.