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Microcontroller · Development Board
Seeed Studio XIAO MG24
Thumb-sized XIAO with Silicon Labs' EFR32MG24 for Matter, Thread, Zigbee, and Bluetooth LE.
- GPIO
- I2C
- SPI
- UART
- ADC
- PWM
- USB
- Bluetooth
- Zigbee
- Thread
- Processor
- Silicon Labs EFR32MG24 @ 78 MHz
- Logic
- 3.3 V GPIOTreat as not 5 V tolerant
- Power
- USB-C, battery pads, 5 V/3.3 V pins
- Format
- Tiny castellated module (21 x 17.8 mm)
Before you wire
4 cautions- 3.3 V GPIO; the 5 V pad is USB power, not a logic level.
- Zephyr's xiao_mg24 devicetree routes I2C0 SCL to PC4 (D4) and SDA to PC5 (D5), the reverse of Seeed's pin map and the Arduino core. Swap the lines, or override the pinctrl, when moving between the two.
- In the Silicon Labs Arduino core, Serial is on back pads D11/D12 (the SAMD11 USB bridge); the D6/D7 edge pads are Serial1.
- USB goes through an onboard SAMD11 bridge; the EFR32MG24 has no native USB.
Pin map
Connector
XIAO 14 castellated pads
USB-C at top, component side up, 7 pads down each long edge
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Pin
Hover, tap, or arrow to a pad to inspect it.
- USB-C at top, component side up; labels follow Seeed's XIAO MG24 pin map and schematic net names.
- EFR32MG24 GPIO runs from the board's 3.3 V rail.
- Back-side pads D11-D18 are not shown on this 14-pad map.
All 14 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | ADC | PC00 · Default SPI SS in the Silicon Labs Arduino core. | ||
| 2 | ADC | PC01 | ||
| 3 | ADC | PC02 | ||
| 4 | ADC | PC03 | ||
| 5 | I2C | I2C | PC04 / A4 | |
| 6 | I2C | I2C | PC05 / A5 | |
| 7 | UART | UART | PC06 / A6 / Serial1 TX | |
| 14 | Power | 5V | ||
| 13 | Ground | GND | ||
| 12 | Power | 3V3 | ||
| 11 | SPI | SPI | PA05 / A10 | |
| 10 | SPI | SPI | PA04 / A9 | |
| 9 | SPI | SPI | PA03 / A8 | |
| 8 | UART | UART | PC07 / A7 / Serial1 RX |
Source references
Why it matters
- Every edge pad except power is analog-capable and PWM-capable.
- 1536 kB flash and 256 kB RAM on a single Cortex-M33.
- A Sense variant adds an IMU and a microphone.
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