Resources:
Nano BLE MCU-nRF52840 PS v1.1
Bottom-pad-positioning
Flash_P25Q16H-UXH-IR_Datasheet
Seeed Studio XIAO nRF52840 BLE Communication Distance Test Report
Seeed Studio XIAO nRF52840 CE | FCC | MIC
XIAO Reference Design
3D Printing “Case” Studies
PCN-XIAO Series Packaging Upgrade.pdf

XIAO nRF52840 Bluetooth 5.0 Microcontroller with Onboard Antenna | Seeed Studio
The XIAO nRF52840 is a compact, ultra-low-power microcontroller board built around the powerful Nordic nRF52840 SoC, featuring a 32-bit ARM Cortex-M4 CPU with FPU running at up to 64 MHz. Designed in the signature thumb-sized 21×17.8 mm XIAO form factor, it offers exceptional wireless capability, rich peripheral support, and impressive energy efficiencymaking it perfect for wearables, IoT nodes, BLE devices, smart gadgets, and rapid prototyping.
With Bluetooth 5.0 / BLE, NFC support, and an onboard antenna, the XIAO nRF52840 ensures stable, long-range wireless communication. It features lithium battery charging, multiple development ports, and deep-sleep power consumption as low as 5 uA, enabling efficient battery-powered and always-on designs. Supported by Arduino, CircuitPython, and MicroPython, this board is ideal for developers at every level, from hobbyists to engineering teams ready for scalable production.
Key Features:

Versatile Microcontroller: It incorporates the Nordic nRF52840 chip with an FPU, operating at speeds of up to 64 MHz. It features multiple development ports and is compatible with Arduino and CircuitPython.
Wireless Capabilities: The XIAO nRF52840 supports Bluetooth 5.0 and BLE functions, with an onboard antenna and NFC connectivity.
Elaborate Power Design: It offers ultra-low power consumption, as low as 5 uA in deep sleep mode, while also supporting lithium battery charge management.
Thumb-Sized Design: With dimensions of 21×17.5mm, it follows the classic form-factor of the Seeed Studio XIAO series, making it suitable for wearable devices.
Perfect for Production: This board is breadboard-friendly and features a surface-mount device (SMD) design with no components on the back.

The Seeed Studio XIAO nRF52840 stands out with its incredibly low power consumption, supporting battery charge management with the embedded BQ25101 chip, which extends its usage time. It features a USB Type-C interface for power supply and code downloads. The onboard memory includes 1 MB of flash and 256 kB of RAM, along with an additional 2 MB QSPI flash. The board provides 11 digital I/O pins that can be used as PWM pins and 6 analog I/O pins for ADC applications. It also supports UART, I2C, and SPI, the three common serial communication protocols. Onboard components include 1 reset button, 1 3-in-one LED, 1 charge LED, and 1 Bluetooth antenna, making code debugging a breeze. This board’s powerful performance makes it suitable for machine learning applications, and its compact size allows it to be used in wearable devices and Internet of Things (IoT) projects, not only for prototyping but also for mass production. Furthermore, the Seeed Studio XIAO nRF52840 is highly compatible with various software options, including Arduino, MicroPython, and CircuitPython. Its flexible I/O capabilities enable it to communicate with a wide range of external devices.
Applications

Wearables & Health Monitoring
IoT Nodes & Wireless Sensors
BLE Beacons & Smart Home Devices
Remote Controllers & Human Interface Devices
Battery-Powered Devices
Low-Power Robotics
Education & Prototyping Projects

Hardware Overview

PinOut

Package List

Seeed Studio XIAO nRF52840 (pin not included)x1
7 Pin Headerx2