Seeed Studio XIAO nRF52840 Plus

Seeed Studio XIAO nRF52840 Plus builds on the standard XIAO nRF52840 with an updated castellation design and pad layout on the back, adding 9 extra SMD pins for boards that need more I/O. It keeps the same Nordic nRF52840 chip with FPU running at up to 64 MHz, and remains fully compatible with Arduino, CircuitPython, and MicroPython. Expanded I/O for Advanced Builds The Plus variant offers 20 GPIOs in total, up from 11 on the standard board, via 9 additional 1.27mm pitch SMD castellation pins. This makes it a better fit for advanced Bluetooth projects that need more digital I/O available through board-to-board soldering, while the backside layout, including aligned battery and debugger pads, stays consistent with future XIAO expansion boards. Wireless Connectivity and Low Power Design Bluetooth Low Energy 5.4 with a built-in antenna and NFC support carry over from the standard board, along with the same efficient power management, including 5 μA deep sleep consumption and integrated Li-ion battery charging. Classic XIAO Form Factor Despite the extra I/O, the board keeps the familiar 21 x 17.8mm XIAO footprint with 2.54mm pin headers and single-sided mounting, and remains natively compatible with the full range of XIAO accessory add-ons, including connectivity modules, sensors, and actuators. Specifications Processor Nordic nRF52840, ARM Cortex-M4 with FPU, up to 64 MHz Wireless Connectivity Bluetooth Low Energy 5.4, Bluetooth Mesh, NFC Memory 256KB RAM, 1MB flash, plus 2MB onboard QSPI flash Built-in Sensors None Interfaces 1x I2C, 2x UART, 2x SPI, 1x I2S PWM / Analog Pins 20 / 6 Onboard Buttons Reset Button, User Button Onboard LEDs 3-in-one LED, Charge LED Battery Charge Chip BQ25101 Programming Languages Arduino, MicroPython, CircuitPython Dimensions 21 x 17.8mm Pinout Resources Seeed Studio Wiki, full setup guides, pinout diagrams, and project examples nRF52840 Datasheet Browse our full range of XIAO Expansion & Breakout Boards Don't need the extra I/O? The standard XIAO nRF52840 covers most projects. Need onboard sensors as well? See the XIAO nRF52840 Sense Plus.