The AVR32DD28-I/SO is an 8-bit microcontroller with 32KB of program memory, 4KB of RAM, 28 pins, and up to 24MHz clock speed. It features on-chip Multi Voltage I/O (MVIO) support, 12-bit Analog-to-Digital Converter (ADC), Zero-Cross Detector (ZCD), Digital-to-Analog Converter (DAC), two Universal Asynchronous Receiver/Transmitter (UART) peripherals, Serial Peripheral Interface (SPI), and Two-Wire Interface (TWI). It is manufactured by Microchip.