XIAO MG24 — Matter / Thread / BLE 5.3
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.
Pinout
- 5V5V pad
USB VBUS power input/output. External input allowed only with diode protection per Seeed documentation.
Type · PowerVoltage · 5V - GNDGND pad
Power/data/signal ground
Type · GroundVoltage · 0V - 3V33V3 pad
Regulated output from onboard regulator
Type · PowerVoltage · 3.3V - D0A0D0 pad, chip PC00
GPIO and ADC input
Type · GPIO, AnalogVoltage · 3.3V logic - D1A1D1 pad, chip PC01
GPIO and ADC input
Type · GPIO, AnalogVoltage · 3.3V logic - D2A2D2 pad, chip PC02
GPIO and ADC input
Type · GPIO, AnalogVoltage · 3.3V logic - D3A3D3 pad, chip PC03
GPIO, SPI function, ADC input
Type · GPIO, AnalogVoltage · 3.3V logic - D4A4SDAD4 pad, chip PC04
GPIO, I2C data, ADC input
Type · GPIO, Analog, I2CVoltage · 3.3V logic - D5A5SCLD5 pad, chip PC05
GPIO, I2C clock, ADC input
Type · GPIO, Analog, I2CVoltage · 3.3V logic - D6A6TX0D6 pad, chip PC06
GPIO, UART transmit, ADC input
Type · GPIO, Analog, UARTVoltage · 3.3V logic - D7A7RX0D7 pad, chip PC07
GPIO, UART receive, ADC input
Type · GPIO, Analog, UARTVoltage · 3.3V logic - D8A8SCK0D8 pad, chip PA03
GPIO, SPI clock, ADC input
Type · GPIO, Analog, SPIVoltage · 3.3V logic - D9A9MISO0D9 pad, chip PA04
GPIO, SPI MISO/data, ADC input
Type · GPIO, Analog, SPIVoltage · 3.3V logic - D10A10MOSI0D10 pad, chip PA05
GPIO, SPI MOSI/data, ADC input
Type · GPIO, Analog, SPIVoltage · 3.3V logic - D11A11D11 pad, chip PA09
GPIO, UART receive via SAMD11_TX alternate, ADC input
Type · GPIO, AnalogVoltage · 3.3V logic - D12A12D12 pad, chip PA08
GPIO, UART transmit via SAMD11_RX alternate, ADC input
Type · GPIO, AnalogVoltage · 3.3V logic - D13A13D13 pad, chip PB02
GPIO, I2C clock, ADC input
Type · GPIO, AnalogVoltage · 3.3V logic - D14A14D14 pad, chip PB03
GPIO, I2C data, ADC input
Type · GPIO, AnalogVoltage · 3.3V logic - D15A15MOSI1D15 pad, chip PB00
GPIO, SPI data, ADC input
Type · GPIO, Analog, SPIVoltage · 3.3V logic - D16A16MISO1D16 pad, chip PB01
GPIO, SPI data, ADC input
Type · GPIO, Analog, SPIVoltage · 3.3V logic - D17A17SCK1D17 pad, chip PA00
GPIO, SPI clock, ADC input
Type · GPIO, Analog, SPIVoltage · 3.3V logic - D18A18CSD18 pad, chip PD02
GPIO, chip select, ADC input
Type · GPIO, Analog, SPIVoltage · 3.3V logic - RESETRESET pad
Board reset
Type · Control - BATADC_BAT / chip PD04
Battery voltage sense via ADC_BAT
Type · PowerVoltage · battery sense
| 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 |
Pin details
24 connections- 5V5V pad
USB VBUS power input/output. External input allowed only with diode protection per Seeed documentation.
PowerVoltage · 5V - GNDGND pad
Power/data/signal ground
GroundVoltage · 0V - 3V33V3 pad
Regulated output from onboard regulator
PowerVoltage · 3.3V - D0A0D0 pad, chip PC00
GPIO and ADC input
GPIO, AnalogVoltage · 3.3V logic - D1A1D1 pad, chip PC01
GPIO and ADC input
GPIO, AnalogVoltage · 3.3V logic - D2A2D2 pad, chip PC02
GPIO and ADC input
GPIO, AnalogVoltage · 3.3V logic - D3A3D3 pad, chip PC03
GPIO, SPI function, ADC input
GPIO, AnalogVoltage · 3.3V logic - D4A4SDAD4 pad, chip PC04
GPIO, I2C data, ADC input
GPIO, Analog, I2CVoltage · 3.3V logic - D5A5SCLD5 pad, chip PC05
GPIO, I2C clock, ADC input
GPIO, Analog, I2CVoltage · 3.3V logic - D6A6TX0D6 pad, chip PC06
GPIO, UART transmit, ADC input
GPIO, Analog, UARTVoltage · 3.3V logic - D7A7RX0D7 pad, chip PC07
GPIO, UART receive, ADC input
GPIO, Analog, UARTVoltage · 3.3V logic - D8A8SCK0D8 pad, chip PA03
GPIO, SPI clock, ADC input
GPIO, Analog, SPIVoltage · 3.3V logic - D9A9MISO0D9 pad, chip PA04
GPIO, SPI MISO/data, ADC input
GPIO, Analog, SPIVoltage · 3.3V logic - D10A10MOSI0D10 pad, chip PA05
GPIO, SPI MOSI/data, ADC input
GPIO, Analog, SPIVoltage · 3.3V logic - D11A11D11 pad, chip PA09
GPIO, UART receive via SAMD11_TX alternate, ADC input
GPIO, AnalogVoltage · 3.3V logic - D12A12D12 pad, chip PA08
GPIO, UART transmit via SAMD11_RX alternate, ADC input
GPIO, AnalogVoltage · 3.3V logic - D13A13D13 pad, chip PB02
GPIO, I2C clock, ADC input
GPIO, AnalogVoltage · 3.3V logic - D14A14D14 pad, chip PB03
GPIO, I2C data, ADC input
GPIO, AnalogVoltage · 3.3V logic - D15A15MOSI1D15 pad, chip PB00
GPIO, SPI data, ADC input
GPIO, Analog, SPIVoltage · 3.3V logic - D16A16MISO1D16 pad, chip PB01
GPIO, SPI data, ADC input
GPIO, Analog, SPIVoltage · 3.3V logic - D17A17SCK1D17 pad, chip PA00
GPIO, SPI clock, ADC input
GPIO, Analog, SPIVoltage · 3.3V logic - D18A18CSD18 pad, chip PD02
GPIO, chip select, ADC input
GPIO, Analog, SPIVoltage · 3.3V logic - RESETRESET pad
Board reset
Control - BATADC_BAT / chip PD04
Battery voltage sense via ADC_BAT
PowerVoltage · battery sense
Start wiring
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