Seeeduino XIAO Arduino Microcontroller SAMD21 Cortex M0+ SKU 102010328 Seeeduino XIAO is the smallest Arduino compatible board in Seeeduino Family. It is an Arduino microcontroller that is embedded with the SAMD21 microchip. The interfaces of Seeeduino XIAO is rich enough in such a tiny Dev. Board as well. Key Features Powerful CPU: ARM Cortex-M0+ 32bit 48MHz microcontroller(SAMD21G18) with 256KB Flash,32KB SRAM Flexible compatibility: Compatible with Arduino IDE Easy project operation: Breadboard-friendly Small size: As small as a thumb(23.5x17.5mm) for wearable devices and small projects. Multiple development interfaces: 11 digital/analog pins, 10 PWM Pins, 1 DAC output, 1 SWD Bonding pad interface, 1 I2C interface, 1 UART interface, 1 SPI interface. Description Take a look at Seeeduino XIAO. What a small size and cute looking It is the smallest member of the Seeeduino family. Seeeduino XIAO still carries the powerful CPU-ARM Cortex-M0+(SAMD21G18) which is a low-power Arduino microcontroller. On the other hand, this little board has good performance in processing but needs less power. As a matter of fact, it is designed in a tiny size and can be used for Arduino wearable devices and small projects. Apart from the strong CPU, Seeeduino XIAO is excellent in many other functions. It has 14 GPIO PINs, which can be used for 11 analog PINs, 11 digital PINs, 1 I2C interface, 1 UART interface, and 1 SPI interface. Some PINs have various functions, A1/D1 to A10/D10 Pins have PWM functions and Pin A0/D0 has a function of DAC which means you can get true analog signals not PWM signals when you define it as an analog pin, thats why 14 GPIO PINs can realize more I/O PINs and interfaces. Moreover, Seeeduino XIAO supports the USB Type-C interface which can supply power and download code. There are power pads at the back of the XIAO which support battery and make it designed for wearable devices to become realistic. Except for the power LED, we add a user LED on board for your better coding experience. Usually a Dev. Board as small as this size will use the chips inner crystal oscillator for time fixing, in order to make the clock more accurate, Seeeduino XIAO layouts an extra 32.768KHz to make the clock more stable. Seeeduino XIAO is perfectly compatible with Arduino IDE, you can easily develop some small projects with the help of the large and comprehensive Arduino library. So get one and you will soon love it Attention All the I/O pins are 3.3V, please do not input more than 3.3V, otherwise, the CPU may be damaged. This is the Wiki of the Seeeduino XIAO, you can view the basic settings of running the board. Specification CPU: ARM Cortex-M0+ CPU(SAMD21G18) running at up to 48MHz Storage: 256KB Flash,32KB SRAM I/O PINs: 14 GPIO PINs,11 analog PINs, 11 digital PINs, 1 DAC output Pin Interface: 1 I2C interface,1 UART interface, 1 SPI interface Power supply and downloading interface: USB Type-C interface LEDs: 1 user LED, 1 power LED, two LEDs for serial port downloading Reset button: two reset button short connect to reset Power Pads: For the battery power supply Software compatibility: Compatible with Arduino IDE Projection cover for protecting the circuit Dimensions: 23.5x17.5x3.5 mm