Seeed Studio XIAO SAMD21 Plus (MPN:100031394)

Seeed Studio XIAO SAMD21 Plus (MPN:100031394)

Seeed Studio XIAO SAMD21 Plus, powered by the Microchip ATSAMD21G18A ARM Cortex-M0+ processor, brings enhanced flexibility and expandability to the tiny and versatile XIAO SAMD21. While maintaining its low-power performance, Arduino compatibility, and compact footprint, the Plus variant features redesigned castellations and backside pad layout, offering 16 additional GPIOs, integrated Li-ion battery management, dedicated Reset and Boot buttons, and an onboard WS2812 RGB LED. It is ideal for advanced IoT projects, battery-powered wearables, embedded applications, and production-ready SoM designs.

User Manual / Datasheet / Example Codes Etc.

Specifications

• Product Name: Seeed Studio XIAO SAMD21 Plus
• Chipset: Microchip SAMD21G18
• Processor; ARM Cortex-M0+ processor runs at up to 48 MHz.
• RAM: 32KB SRAM
• Flash: 256KB Flash
• Interface
• GPIO Pin x30
• Digital Pin x27
• Analog Pin x11
• DAC x1
• I2C x2
• UART x1
• SPI x1
• I2S ×1
• Onboard
• RGB LED x1
• Charge LED ×1
• Reset Button x1
• Boot Button x1

• Battery Management (PMIC): Onboard PMIC
• Power: input Voltage (Type-C): 5V
• Input Voltage (BAT): 5V
• BAT-to-3V3 Backflow Protection: Yes
• Working Temperature: -40°C ~ 85°C
• Dimensions: 21 x 17.8mm
• Software Compatibility: Arduino, PlatformIO, MicroPython, CircuitPython, Zephyr,and more to come

Applications

• STEM Education - Perfect for learning embedded programming, Arduino development, electronics, and ARM Cortex-M microcontrollers. Rich documentation and native USB support make it an excellent platform for beginners and educators.
• USB HID Devices – Leverage the ATSAMD21 native USB peripheral to create custom keyboards, macro pads, game controllers, MIDI instruments, USB serial devices, and other Human Interface Device (HID) applications.
• Wearable Electronics – The compact 21 × 17.8 mm footprint, onboard battery charging, and low-power MCU make XIAO SAMD21 Plus an excellent choice for smart badges, wearable sensors, health monitoring devices, and portable electronics.
• Embedded Prototyping - With 16 additional GPIOs, developers can integrate more peripherals without external GPIO expanders, enabling faster prototyping of complex embedded systems while maintaining the familiar XIAO form factor.
• Smart Home & Automation - Connect multiple Grove modules, displays, communication modules, and sensors to build automation controllers, environmental monitoring stations, lighting controllers, and edge computing devices.
• Robotics – Suitable for educational robots, motor controllers, sensor hubs, and compact robotic platforms requiring reliable low-power control and flexible I/O expansion.
• Human-Machine Interface (HMI) - The onboard WS2812 RGB LED together with dedicated Reset and Boot buttons provides convenient visual feedback and user interaction, making XIAO SAMD21 Plus well suited for compact control panels, interactive devices, and embedded user interfaces.
• Battery-Powered IoT – The integrated PMIC and Li-ion charging circuit simplify the design of portable IoT devices, wireless sensor nodes, environmental monitoring systems, and remote data loggers.
• Production-Ready SoM Design – Designed for board-to-board soldering through castellated edges, XIAO SAMD21 Plus serves as a production-ready System-on-Module (SoM). The additional GPIOs and standardized XIAO Plus layout simplify hardware migration from prototype to mass production.

Package Includes

• Seeed Studio XIAO SAMD21 Plusx1
• 7-pin headerx2