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Microcontroller · Development Board
Seeed Studio XIAO ESP32-C5
XIAO with ESP32-C5 dual-band Wi-Fi 6, Bluetooth LE, Zigbee, and Thread.
- GPIO
- I2C
- SPI
- UART
- ADC
- PWM
- USB
- Wi-Fi
- Bluetooth
- Zigbee
- Thread
- Processor
- Espressif ESP32-C5 (RISC-V)
- 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.
- D2 (GPIO25) and D3 (GPIO7) are ESP32-C5 strapping pins; external pulls or driven peripherals can change boot behavior.
- GPIO27 drives the user LED and GPIO28 is the Boot button; GPIO6 and GPIO26 are battery sensing.
- Only D0 is an analog input on the edge pads.
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 ESP32-C5 pin map, schematic, and the Zephyr xiao_d connector map.
- Only D0 (GPIO1, ADC1_CH0) is an analog input on the edge pads.
- Back-side JTAG (MTMS/MTDI/MTCK/MTDO) and battery pads are not shown on this 14-pad map.
All 14 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | ADC | GPIO1 | ||
| 2 | GPIO | GPIO0 | ||
| 3 | GPIO | GPIO25 · Strapping pin; external pulls or a driven peripheral can change boot behavior. | ||
| 4 | GPIO | GPIO7 · Strapping pin; external pulls or a driven peripheral can change boot behavior. | ||
| 5 | I2C | I2C | GPIO23 | |
| 6 | I2C | I2C | GPIO24 | |
| 7 | UART | UART | GPIO11 | |
| 14 | Power | 5V | ||
| 13 | Ground | GND | ||
| 12 | Power | 3V3 | ||
| 11 | SPI | SPI | GPIO10 | |
| 10 | SPI | SPI | GPIO9 | |
| 9 | SPI | SPI | GPIO8 | |
| 8 | UART | UART | GPIO12 |
Source references
Why it matters
- 2.4 GHz and 5 GHz Wi-Fi 6 on a 240 MHz RISC-V core.
- U.FL connector for an external antenna.
- GPIO-matrix routing lets most edge pads carry other serial buses or PWM.
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