Seeed Xiao-form-factor board with dual-core ESP32-S3 at 240 MHz, 8 MB flash, 512 KB SRAM, 2.4 GHz Wi-Fi, BLE, native USB-C, and STEMMA QT I2C connector. Operates at 3.3 V. Choose this over the S2 variant when Bluetooth is needed.
USB-C connector used for powering and programming the QT Py ESP32-S3 board.
Output from the on-board 3.3V regulator. Adafruit states these pins can supply 600mA peak.
Common ground for all power and logic on the board.
5V output from the USB port. Adafruit also documents using the 5V pin as a protected external voltage input with a diode between the source and the pin.
Back-side battery input pad paired with GND for external battery packs.
GPIO/analog input pad. Adafruit states A0 through A3 can be analog inputs.
GPIO/analog input pad. Adafruit states A0 through A3 can be analog inputs.
GPIO/analog input pad. Adafruit states A2 can also do capacitive touch.
GPIO/analog input pad. Adafruit states A3 can also do capacitive touch.
Main I2C clock pad. Adafruit notes this is not shared with the STEMMA QT connector and has no pull-up on the pin. Also supports capacitive touch and analog input.
Main I2C data pad. Adafruit notes this is not shared with the STEMMA QT connector and has no pull-up on the pin. Also supports capacitive touch and analog input.
UART receive pin. Connects to the transmit pin on a sensor or breakout.
UART transmit pin. Connects to the receive pin on a sensor or breakout. Adafruit notes TX can also do capacitive touch.
SPI clock pin on the ESP32-S3 high-speed peripheral.
SPI microcontroller-in / sensor-out pin.
SPI microcontroller-out / sensor-in pin.
JST SH 4-pin STEMMA QT connector clock line. Adafruit states the connector breaks out a second I2C interface: SCL1, SDA1, 3.3V and GND.
JST SH 4-pin STEMMA QT connector data line. Adafruit states the connector breaks out a second I2C interface: SCL1, SDA1, 3.3V and GND.
3.3V rail on the JST SH STEMMA QT connector.
Ground on the JST SH STEMMA QT connector.
Boot/DFU button. Adafruit states it can put the board into ROM bootloader mode and can be read as GPIO 0 with input pull-up.
Reset button restarts the board and helps enter the UF2 bootloader when tapped during the NeoPixel status LED boot indication.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| USB-C port | power | USB-C connector used for powering and programming the QT Py ESP32-S3 board. | USB 5V input from a USB-C cable | |
| 3.3V | power | Output from the on-board 3.3V regulator. Adafruit states these pins can supply 600mA peak. | 3.3V regulated output | |
| GND | power | Common ground for all power and logic on the board. | 0V ground reference | |
| 5V | power | 5V output from the USB port. Adafruit also documents using the 5V pin as a protected external voltage input with a diode between the source and the pin. | 5V USB rail; external input only with diode protection per Adafruit guidance | |
| BAT | power | Back-side battery input pad paired with GND for external battery packs. | 3V to 6V battery input per Adafruit pinouts page | |
| A0 | analog | GPIO/analog input pad. Adafruit states A0 through A3 can be analog inputs. | ||
| A1 | analog | GPIO/analog input pad. Adafruit states A0 through A3 can be analog inputs. | ||
| A2 | analog | GPIO/analog input pad. Adafruit states A2 can also do capacitive touch. | ||
| A3 | analog | GPIO/analog input pad. Adafruit states A3 can also do capacitive touch. | ||
| SCL | signal | Main I2C clock pad. Adafruit notes this is not shared with the STEMMA QT connector and has no pull-up on the pin. Also supports capacitive touch and analog input. | ||
| SDA | signal | Main I2C data pad. Adafruit notes this is not shared with the STEMMA QT connector and has no pull-up on the pin. Also supports capacitive touch and analog input. | ||
| RX | signal | UART receive pin. Connects to the transmit pin on a sensor or breakout. | ||
| TX | signal | UART transmit pin. Connects to the receive pin on a sensor or breakout. Adafruit notes TX can also do capacitive touch. | ||
| SCK | signal | SPI clock pin on the ESP32-S3 high-speed peripheral. | ||
| MI | signal | SPI microcontroller-in / sensor-out pin. | ||
| MO | signal | SPI microcontroller-out / sensor-in pin. | ||
| STEMMA QT SCL1 | signal | JST SH 4-pin STEMMA QT connector clock line. Adafruit states the connector breaks out a second I2C interface: SCL1, SDA1, 3.3V and GND. | 3.3V logic on STEMMA QT connector | |
| STEMMA QT SDA1 | signal | JST SH 4-pin STEMMA QT connector data line. Adafruit states the connector breaks out a second I2C interface: SCL1, SDA1, 3.3V and GND. | 3.3V logic on STEMMA QT connector | |
| STEMMA QT 3.3V | power | 3.3V rail on the JST SH STEMMA QT connector. | 3.3V | |
| STEMMA QT GND | power | Ground on the JST SH STEMMA QT connector. | 0V ground reference | |
| Boot button / GPIO 0 | control | Boot/DFU button. Adafruit states it can put the board into ROM bootloader mode and can be read as GPIO 0 with input pull-up. | ||
| Reset button | control | Reset button restarts the board and helps enter the UF2 bootloader when tapped during the NeoPixel status LED boot indication. |
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