The ATSAM3S1BA-MU is a microcontroller unit (MCU) sold by Microchip Technology. It is part of the family of SAM3S series MCUs, powered by an ARM Cortex-M3 processor. It has 128KB of Flash program memory and 8KB of RAM. It also has a multitude of peripherals and features such as USART, SPI, CAN, I2C, 16-bit timer/counter, Event System, 12-bit ADC, 10-bit DAC, 32 kHz oscillator, and Brown-Out detect. The ATSAM3S1BA-MU is ideal for use in consumer, industrial, automotive, and medical applications.