Adafruit QT Py ESP32-S2 WiFi Dev Board with STEMMA QT

Seeed Xiao-form-factor board with single-core ESP32-S2 at 240 MHz, 4 MB flash, 2 MB PSRAM, 2.4 GHz Wi-Fi, native USB-C, and STEMMA QT I2C connector. No Bluetooth. 3.3 V logic with 5 capacitive touch inputs and 10 analog inputs.

Logical pinout · physical placement not verified

USB-C
USB-C port used for both powering and programming the board.
Type · Power
3.3V
Output from the 3.3V regulator.
Type · PowerVoltage · 3.3 V output, Adafruit states 600 mA peak
GND
Common ground for all power and logic.
Type · GroundVoltage · 0 V
5V
5 V out from USB port; can also be used as voltage input with a diode as described by Adafruit.
Type · PowerVoltage · 5 V
A0
Analog input on ADC2 and 8-bit DAC output; Adafruit notes A0 has a 10K pullup to 3.3 V.
Type · AnalogVoltage · ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
A1
Analog input on ADC2 and 8-bit DAC output.
Type · AnalogVoltage · ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
A2
Analog input on ADC1; can do capacitive touch.
Type · AnalogVoltage · ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
A3
Analog input on ADC1; can do capacitive touch.
Type · AnalogVoltage · ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
SCL
Main I2C clock pad; Adafruit lists SCL among capacitive-touch-capable pads.
Type · I2CVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
SDA
Main I2C data pad; Adafruit lists SDA among capacitive-touch-capable pads.
Type · I2CVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
RX
UART receive pin, connect to TX on sensor or breakout.
Type · UARTVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
TX
UART transmit pin, connect to RX on sensor or breakout; can do capacitive touch.
Type · UARTVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
SCK
SPI clock pin on ESP32-S2 high-speed peripheral.
Type · SPIVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
MI
SPI microcontroller-in / sensor-out pin.
Type · SPIVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
MO
SPI microcontroller-out / sensor-in pin.
Type · SPIVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
STEMMA QT
JST SH 4-pin STEMMA QT connector breaks out a second I2C interface.
Type · I2CVoltage · SCL1, SDA1, 3.3 V, GND per Adafruit pinout page

Pin	Type	Function	Voltage
USB-C	Power	USB-C port used for both powering and programming the board.
3.3V	Power	Output from the 3.3V regulator.	3.3 V output, Adafruit states 600 mA peak
GND	Ground	Common ground for all power and logic.	0 V
5V	Power	5 V out from USB port; can also be used as voltage input with a diode as described by Adafruit.	5 V
A0	Analog	Analog input on ADC2 and 8-bit DAC output; Adafruit notes A0 has a 10K pullup to 3.3 V.	ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
A1	Analog	Analog input on ADC2 and 8-bit DAC output.	ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
A2	Analog	Analog input on ADC1; can do capacitive touch.	ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
A3	Analog	Analog input on ADC1; can do capacitive touch.	ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
SCL	I2C	Main I2C clock pad; Adafruit lists SCL among capacitive-touch-capable pads.	3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
SDA	I2C	Main I2C data pad; Adafruit lists SDA among capacitive-touch-capable pads.	3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
RX	UART	UART receive pin, connect to TX on sensor or breakout.	3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
TX	UART	UART transmit pin, connect to RX on sensor or breakout; can do capacitive touch.	3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
SCK	SPI	SPI clock pin on ESP32-S2 high-speed peripheral.	3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
MI	SPI	SPI microcontroller-in / sensor-out pin.	3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
MO	SPI	SPI microcontroller-out / sensor-in pin.	3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
STEMMA QT	I2C	JST SH 4-pin STEMMA QT connector breaks out a second I2C interface.	SCL1, SDA1, 3.3 V, GND per Adafruit pinout page

Logical pinout · physical placement not verified

Pin details

16 connections

USB-C
USB-C port used for both powering and programming the board.
Power
3.3V
Output from the 3.3V regulator.
PowerVoltage · 3.3 V output, Adafruit states 600 mA peak
GND
Common ground for all power and logic.
GroundVoltage · 0 V
5V
5 V out from USB port; can also be used as voltage input with a diode as described by Adafruit.
PowerVoltage · 5 V
A0
Analog input on ADC2 and 8-bit DAC output; Adafruit notes A0 has a 10K pullup to 3.3 V.
AnalogVoltage · ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
A1
Analog input on ADC2 and 8-bit DAC output.
AnalogVoltage · ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
A2
Analog input on ADC1; can do capacitive touch.
AnalogVoltage · ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
A3
Analog input on ADC1; can do capacitive touch.
AnalogVoltage · ESP32-S2 ADC input, do not exceed 3.3 V / 3.6 V max directly
SCL
Main I2C clock pad; Adafruit lists SCL among capacitive-touch-capable pads.
I2CVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
SDA
Main I2C data pad; Adafruit lists SDA among capacitive-touch-capable pads.
I2CVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
RX
UART receive pin, connect to TX on sensor or breakout.
UARTVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
TX
UART transmit pin, connect to RX on sensor or breakout; can do capacitive touch.
UARTVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
SCK
SPI clock pin on ESP32-S2 high-speed peripheral.
SPIVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
MI
SPI microcontroller-in / sensor-out pin.
SPIVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
MO
SPI microcontroller-out / sensor-in pin.
SPIVoltage · 3 V logic max for serial input per Adafruit QT Py ESP32-S2 pinout page
STEMMA QT
JST SH 4-pin STEMMA QT connector breaks out a second I2C interface.
I2CVoltage · SCL1, SDA1, 3.3 V, GND per Adafruit pinout page

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