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Seeed Studio XIAO SAMD21 Plus

100031394 · Seeed Studio

Seeed Studio XIAO SAMD21 Plus photo

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. (Seeed SKU 100031394)

Part number100031394
ManufacturerSeeed Studio
CategoryDevelopment Boards › SAMD / SAM Boards
Pins14

Seeed Studio XIAO SAMD21 Plus pinout

PinNameTypeDescription
1D0/A0bidirectional
2D1/A1bidirectional
3D2/A2bidirectional
4D3/A3bidirectional
5D4/SDAbidirectional
6D5/SCLbidirectional
7D6/TXbidirectional
8D7/RXbidirectional
9D8/SCKbidirectional
10D9/MISObidirectional
11D10/MOSIbidirectional
123V3power
13GNDground
145Vpower

Schematic symbol and footprint

3V3125V14D5/SCL6D6/TX7D7/RX8D8/SCK9D9/MISO10D10/MOSI11D0/A01D1/A12D2/A23D3/A34D4/SDA5GND13
Schematic symbol
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Footprint: Seeed Studio XIAO (2 x 7, 15.24 mm rows) — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.

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