the world's most energy friendly microcontrollers EFM32TG232 DATASHEET F32/F16/F8 Preliminary ARM Cortex-M3 CPU platform High Performance 32-bit processor @ up to 32 MHz Wake-up Interrupt Controller Flexible Energy Management System 20 nA @ 3 V Shutoff Mode 0.6 µA @ 3 V Stop Mode, including Power-on Reset, Brown-out Detector, RAM and CPU retention 1 µA @ 3 V Deep Sleep Mode, including RTC with 32.768 kHz oscillator, Power-on .