Seeed Studio XIAO nRF52840
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Internal Reference: SS-001

Introducing the Seeed Studio XIAO nRF52840—the perfect choice for your next mini Arduino project. This tiny but powerful processor packs a major punch with its Nordic nRF52840 ARM® Cortex®-M4 with FPU(Floating Point Unit) running up to 64 MHz.

Seeed Studio XIAO Series are very small development boards, sharing a similar hardware structure, where the size is literally thumb-sized. The code name "XIAO" here represents its half feature "Tiny", and the other half will be "Great Power".

Seeed Studio XIAO nRF52840 is carrying wireless capability for the first time and it supports Bluetooth 5.0, also able to operate with low power consumption. It will be your best microcontroller for Bluetooth applications.


  • Versatile Microcontroller: Incorporate the Nordic nRF52840 chip with FPU, operating up to 64 MHz, mounted multiple development ports, supported by Arduino / CircuitPython
  • Wireless Capabilities: Implement Bluetooth 5.0, BLE functions with onboard antenna, also provide NFC connectivity
  • Elaborate Power Design: Provide ultra-low power consumption as 5 μA in deep sleep mode while supporting lithium battery charge management
  • Thumb-sized Design: 21 x 17.5mm, Seeed Studio XIAO series classic form factor, suitable for wearable devices
  • Perfect for Production: Breadboard-friendly & SMD design, no components on the back

Seeed Studio XIAO nRF52840 has an ultra-low power consumption of only 5 μA in the deep sleep mode, the embedded BQ25101 chips support battery charge management which prolongs its use time. Moreover, Seeed Studio XIAO nRF52840 supports the USB Type-C interface which can supply power and download code. It also has rich On-chip Memory of 1 MB flash and 256 kB RAM and an Onboard Memory of 2 MB QSPI flash. There are 11 digital I/O that can be used as PWM pins and 6 analog I/O that can be used as ADC pins. It supports UART, IIC, and SPI all three common serial ports. 1 Reset button, 1 3-in-one LED, 1 Charge LED, and 1 Bluetooth antenna are on board, allowing developers to debug their code very easily.

The powerful performance makes it perfect for machine learning applications, and the tiny size allows it to be used in wearable devices and Internet of Things projects, not just for prototypes but the mass production. Furthermore, Seeed Studio XIAO nRF52840 is friendly to the communities for its strong software compatibilities, which support Arduino, Micropython, and CircuitPython. Except for the software, flexible I/O allows it to speak to almost any external device.

Note: XIAO SoM User Manual open-sources all hardware and software materials of XIAO, providing professional product design guidelines to help you accelerate ideas off the ground, streamline product design, providing a seamless experience from module selection to mass production. You can check here to see more info.

You can have access to the Seeed Studio Grove ecosystem by connecting it to the compatible Seeed Studio XIAO expansion board. For example, you can make a BLE AI-driven Smartwatch Detecting Potential Sun Damage by connecting the Seeed Studio XIAO nRF52840 with an expansion board, and a Grove - UV Sensor. Get started and explore the infinite possibilities of the Seeed Studio XIAO series!

If you are interested in programming embedded machine learning, we have Codecraft visual programming that can help you quickly start your own TinyML project. And we have set up a #tinyml channel on our Discord server, please click to join for 24/7 making, sharing, discussing, and helping each other out.

We already have 5 XIAO products based on different solutions in the XIAO family, to help you better understand the differences and choose the most suitable part for your projects, please refer to the Seeed Studio XIAO Series Page.

We already have 5 XIAO products based on different solutions in the XIAO family, to help you better understand the differences and choose the most suitable part for your projects, please refer to the Seeed Studio XIAO Series Page.



  • Wearable devices
  • Wireless connect
  • Embedded machine learning projects
  • Perfect for mini Arduino projects
  • Tiny Machine Learning application

Hardware Pinout


  • Processor: Nordic nRF52840, ARM® Cortex®-M4 with FPU runs up to 64 MHz
  • Wireless: Bluetooth 5.0/NFC
  • On-chip Memory: 1 MB flash and 256 kB RAM
  • Onboard Memory: 2 MB QSPI flash
  • Interface: 1xUART, 1xIIC, 1xSPI, 1xNFC, 1xSWD,11xGPIO(PWM), 6xADC
  • Dimensions: 21 x 17.5mm
  • Circuit operating voltage: 3.3V@200mA
  • Charging current: 50mA/100mA
  • Input voltage (VIN): 5V
  • Standby power consumption: <5μA