Devices EFM32PG23 Series EFM32PG23B310 EFM32PG23B310 Silicon Labs Devices 4 EFM32PG23B310F128IM48 EFM32PG23B310 Cortex-M33 EFM32PG23B310F256IM48 EFM32PG23B310 Cortex-M33 EFM32PG23B310F512IM48 EFM32PG23B310 Cortex-M33 EFM32PG23B310F64IM48 EFM32PG23B310 Cortex-M33