ESP82x Single-Core Wi-Fi SoCs Espressif Systems ESP82x Wi-Fi SoCs (System-on-Chip) offer complete, self-contained Wi-Fi networking solutions for IoT (Internet of Things) applications. The ESP8266 and ESP8285 SoCs integrate a Tensilica L106 32-bit Microcontroller Unit (MCU), which features extra-low power consumption and 16-bit RSIC reaching a maximum clock speed of 160MHz. With the Real-Time Operation System (RTOS) enabled and a functional Wi-Fi stack, about 80% of the processing power is available for user application programming and development.