XIAO nRF52840 Pre-Soldered Bluetooth 5.4 Board 64MHz Cortex-M4F 1MB Flash 256KB RAM 2MB QSPI NFC

XIAO nRF52840 Pre-Soldered Bluetooth Development Board

The XIAO nRF52840 is a compact, low-power wireless microcontroller development board built around the Nordic nRF52840 SoC. It combines a 64MHz Arm Cortex-M4 processor with floating-point support, Bluetooth Low Energy connectivity, Bluetooth Mesh, NFC, 1MB internal Flash, 256KB RAM and 2MB onboard QSPI Flash. Its pre-soldered headers and 21 × 17.8mm footprint make it suitable for wearable electronics, wireless sensors, embedded machine learning and compact IoT prototypes.

Technical Specifications

• Product model: XIAO nRF52840
• Version: Pre-soldered
• Microcontroller: Nordic nRF52840 SoC
• Processor architecture: 32-bit Arm Cortex-M4 with FPU
• Maximum clock frequency: 64MHz
• Internal Flash memory: 1MB
• RAM: 256KB
• Additional onboard memory: 2MB QSPI Flash
• Wireless connectivity: Bluetooth Low Energy 5.4
• Mesh connectivity: Bluetooth Mesh
• Wireless antenna: Onboard 2.4GHz antenna
• NFC connectivity: NFC interface through dedicated NFC pins
• UART interfaces: 1
• I²C interfaces: 1
• SPI interfaces: 1
• Debug interface: SWD
• Digital I/O: 11 GPIOs with PWM capability
• Analog inputs: 6 ADC channels
• USB connector: USB Type-C
• Onboard controls: RESET button
• Onboard indicators: Programmable RGB user LED and charging LED
• Logic voltage: 3.3V
• Specified 3.3V current capacity: Up to 200mA
• USB/VIN input: 5V DC
• Battery input: 3.7V
• Battery management: Onboard lithium-battery charging and discharging management
• Selectable charging current: 50mA or 100mA
• Standby current: Less than 5μA under specified conditions
• Programming compatibility: Arduino, CircuitPython and MicroPython
• Dimensions: 21 × 17.8mm
• Header configuration: Pre-soldered
• Component layout: Single-sided surface-mount design
• Integrated sensors: None

Nordic nRF52840 Processing

The Nordic nRF52840 integrates a 32-bit Arm Cortex-M4 processor operating at up to 64MHz. Its hardware floating-point unit, 1MB internal Flash and 256KB RAM provide suitable resources for Bluetooth protocol stacks, sensor processing, embedded control and compact machine-learning applications.

Bluetooth LE and Bluetooth Mesh

Bluetooth Low Energy connectivity and an onboard 2.4GHz antenna support communication with smartphones, computers, gateways and compatible wireless peripherals. Bluetooth Mesh support enables development of distributed lighting, sensor and automation networks when used with compatible software.

NFC Connectivity

Dedicated NFC pins provide access to the nRF52840 NFC interface for compatible external NFC antenna circuits. This supports applications such as device identification, tap-based interaction and simplified wireless-device commissioning.

GPIO and Peripheral Expansion

The board provides 11 PWM-capable GPIOs, six ADC channels, UART, I²C and SPI interfaces for connecting sensors, displays, actuators and communication peripherals. An SWD interface supports compatible programming and hardware-debugging equipment.

Low-Power Battery Operation

The board can receive 5V input through USB Type-C or operate from a compatible 3.7V rechargeable lithium battery. Integrated battery management, selectable 50mA or 100mA charging current and standby consumption below 5μA under specified conditions support portable and intermittently active wireless devices.

Compact Pre-Soldered Design

The 21 × 17.8mm board features pre-soldered headers for immediate breadboard and jumper-wire connection. Its single-sided component layout also supports integration into compact wearable devices and custom carrier boards.

Typical Applications

• Bluetooth Low Energy devices
• Bluetooth Mesh sensor networks
• Wearable electronics
• Wireless environmental sensors
• Battery-powered IoT nodes
• NFC-enabled embedded devices
• TinyML and edge-processing prototypes
• Mini Arduino-compatible projects
• Education and rapid prototyping