Thumb-sized BLE 5.0 and NFC development board with a 64 MHz Arm Cortex-M4F (nRF52840), supported by Arduino and CircuitPython. No onboard sensors; paired sibling XIAO nRF52840 Sense adds IMU and microphone.
VBUS power input/output
Ground
3.3V output to peripherals
GPIO, analog input AIN0
GPIO, analog input AIN1
GPIO, analog input AIN4
GPIO, analog input AIN5
GPIO, I2C data, analog input AIN2
GPIO, I2C clock, analog input AIN3
GPIO, UART transmit
GPIO, UART receive
GPIO, SPI clock
GPIO, SPI MISO
GPIO, SPI MOSI
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| 5V | XIAO edge pad | Power | VBUS power input/output | 5V / VBUS |
| GND | XIAO edge pad | Ground | Ground | 0V |
| 3V3 | XIAO edge pad | Power | 3.3V output to peripherals | 3.3V |
| D0A0 | XIAO edge pad, P0.02 | GPIO, Analog | GPIO, analog input AIN0 | 3.3V logic |
| D1A1 | XIAO edge pad, P0.03 | GPIO, Analog | GPIO, analog input AIN1 | 3.3V logic |
| D2A2 | XIAO edge pad, P0.28 | GPIO, Analog | GPIO, analog input AIN4 | 3.3V logic |
| D3A3 | XIAO edge pad, P0.29 | GPIO, Analog | GPIO, analog input AIN5 | 3.3V logic |
| D4SDA | XIAO edge pad, P0.04 | GPIO, I2C | GPIO, I2C data, analog input AIN2 | 3.3V logic |
| D5SCL | XIAO edge pad, P0.05 | GPIO, I2C | GPIO, I2C clock, analog input AIN3 | 3.3V logic |
| D6TX | XIAO edge pad, P1.11 | GPIO, UART | GPIO, UART transmit | 3.3V logic |
| D7RX | XIAO edge pad, P1.12 | GPIO, UART | GPIO, UART receive | 3.3V logic |
| D8SCK | XIAO edge pad, P1.13 | GPIO, SPI | GPIO, SPI clock | 3.3V logic |
| D9MISO | XIAO edge pad, P1.14 | GPIO, SPI | GPIO, SPI MISO | 3.3V logic |
| D10MOSI | XIAO edge pad, P1.15 | GPIO, SPI | GPIO, SPI MOSI | 3.3V logic |
VBUS power input/output
Ground
3.3V output to peripherals
GPIO, analog input AIN0
GPIO, analog input AIN1
GPIO, analog input AIN4
GPIO, analog input AIN5
GPIO, I2C data, analog input AIN2
GPIO, I2C clock, analog input AIN3
GPIO, UART transmit
GPIO, UART receive
GPIO, SPI clock
GPIO, SPI MISO
GPIO, SPI MOSI
UART · SPI · 3.3 V · 5 V · Breakout
Seeed describes MDBT50Q-1M and MDBT50Q-P1M as Bluetooth 5.0 / BLE modules based on Nordic nRF52840, with GPIO, SPI, UART, I2C, I2S, PWM, …
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