Compact IoT board using Silicon Labs EFR32MG24 (78 MHz Cortex-M33, 256 KB RAM, 1.5 MB flash + SPI flash), supporting Matter over Thread and BLE 5.3. Suited for smart-home device development. No onboard sensors; see XIAO MG24 Sense for that variant.
USB VBUS power input/output. External input allowed only with diode protection per Seeed documentation.
Power/data/signal ground
Regulated output from onboard regulator
GPIO and ADC input
GPIO and ADC input
GPIO and ADC input
GPIO, SPI function, ADC input
GPIO, I2C data, ADC input
GPIO, I2C clock, ADC input
GPIO, UART transmit, ADC input
GPIO, UART receive, ADC input
GPIO, SPI clock, ADC input
GPIO, SPI MISO/data, ADC input
GPIO, SPI MOSI/data, ADC input
GPIO, UART receive via SAMD11_TX alternate, ADC input
GPIO, UART transmit via SAMD11_RX alternate, ADC input
GPIO, I2C clock, ADC input
GPIO, I2C data, ADC input
GPIO, SPI data, ADC input
GPIO, SPI data, ADC input
GPIO, SPI clock, ADC input
GPIO, chip select, ADC input
Board reset
Battery voltage sense via ADC_BAT
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| 5V | 5V pad | Power | USB VBUS power input/output. External input allowed only with diode protection per Seeed documentation. | 5V |
| GND | GND pad | Ground | Power/data/signal ground | 0V |
| 3V3 | 3V3 pad | Power | Regulated output from onboard regulator | 3.3V |
| D0A0 | D0 pad, chip PC00 | GPIO, Analog | GPIO and ADC input | 3.3V logic |
| D1A1 | D1 pad, chip PC01 | GPIO, Analog | GPIO and ADC input | 3.3V logic |
| D2A2 | D2 pad, chip PC02 | GPIO, Analog | GPIO and ADC input | 3.3V logic |
| D3A3 | D3 pad, chip PC03 | GPIO, Analog | GPIO, SPI function, ADC input | 3.3V logic |
| D4A4SDA | D4 pad, chip PC04 | GPIO, Analog, I2C | GPIO, I2C data, ADC input | 3.3V logic |
| D5A5SCL | D5 pad, chip PC05 | GPIO, Analog, I2C | GPIO, I2C clock, ADC input | 3.3V logic |
| D6A6TX0 | D6 pad, chip PC06 | GPIO, Analog, UART | GPIO, UART transmit, ADC input | 3.3V logic |
| D7A7RX0 | D7 pad, chip PC07 | GPIO, Analog, UART | GPIO, UART receive, ADC input | 3.3V logic |
| D8A8SCK0 | D8 pad, chip PA03 | GPIO, Analog, SPI | GPIO, SPI clock, ADC input | 3.3V logic |
| D9A9MISO0 | D9 pad, chip PA04 | GPIO, Analog, SPI | GPIO, SPI MISO/data, ADC input | 3.3V logic |
| D10A10MOSI0 | D10 pad, chip PA05 | GPIO, Analog, SPI | GPIO, SPI MOSI/data, ADC input | 3.3V logic |
| D11A11 | D11 pad, chip PA09 | GPIO, Analog | GPIO, UART receive via SAMD11_TX alternate, ADC input | 3.3V logic |
| D12A12 | D12 pad, chip PA08 | GPIO, Analog | GPIO, UART transmit via SAMD11_RX alternate, ADC input | 3.3V logic |
| D13A13 | D13 pad, chip PB02 | GPIO, Analog | GPIO, I2C clock, ADC input | 3.3V logic |
| D14A14 | D14 pad, chip PB03 | GPIO, Analog | GPIO, I2C data, ADC input | 3.3V logic |
| D15A15MOSI1 | D15 pad, chip PB00 | GPIO, Analog, SPI | GPIO, SPI data, ADC input | 3.3V logic |
| D16A16MISO1 | D16 pad, chip PB01 | GPIO, Analog, SPI | GPIO, SPI data, ADC input | 3.3V logic |
| D17A17SCK1 | D17 pad, chip PA00 | GPIO, Analog, SPI | GPIO, SPI clock, ADC input | 3.3V logic |
| D18A18CS | D18 pad, chip PD02 | GPIO, Analog, SPI | GPIO, chip select, ADC input | 3.3V logic |
| RESET | RESET pad | Control | Board reset | |
| BAT | ADC_BAT / chip PD04 | Power | Battery voltage sense via ADC_BAT | battery sense |
USB VBUS power input/output. External input allowed only with diode protection per Seeed documentation.
Power/data/signal ground
Regulated output from onboard regulator
GPIO and ADC input
GPIO and ADC input
GPIO and ADC input
GPIO, SPI function, ADC input
GPIO, I2C data, ADC input
GPIO, I2C clock, ADC input
GPIO, UART transmit, ADC input
GPIO, UART receive, ADC input
GPIO, SPI clock, ADC input
GPIO, SPI MISO/data, ADC input
GPIO, SPI MOSI/data, ADC input
GPIO, UART receive via SAMD11_TX alternate, ADC input
GPIO, UART transmit via SAMD11_RX alternate, ADC input
GPIO, I2C clock, ADC input
GPIO, I2C data, ADC input
GPIO, SPI data, ADC input
GPIO, SPI data, ADC input
GPIO, SPI clock, ADC input
GPIO, chip select, ADC input
Board reset
Battery voltage sense via ADC_BAT
UART · SPI · 3.3 V · 5 V · Breakout
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