Adafruit ESP32-S2 Feather with BME280 Sensor - STEMMA QT

USB-C
USB-C port used for both powering and programming the board; USB power also charges the LiPoly battery when connected.
Type · power dataVoltage · USB 5V input from the USB-C jack when connected.
LiPoly JST 2-PH
2-pin JST-PH battery connector for a 3.7/4.2V LiPoly battery; can power the Feather and charge from USB.
Type · powerVoltage · 3.7/4.2V LiPoly battery connection; Adafruit says use 250mAh or larger.
GND
Common ground for power and logic.
Type · groundVoltage · 0V common ground.
BAT
Positive voltage to/from the 2-pin JST jack for the optional LiPoly battery.
Type · powerVoltage · Battery positive, 3.7/4.2V LiPoly domain.
USB
Positive voltage to/from the USB-C jack when USB is connected.
Type · powerVoltage · USB positive voltage, nominal 5V.
EN
3.3V regulator enable; pulled up, connect to ground to disable the 3.3V regulator.
Type · controlVoltage · 3.3V regulator enable logic.
3.3V
Output from the onboard 3.3V regulator; Adafruit states these pins can supply 500mA peak.
Type · powerVoltage · 3.3V regulated output.
A0
Analog input and one of the only DAC output pins; Adafruit states A0 and A1 can be used as 8-bit true analog outputs.
Type · analog io
A1
Analog input and one of the only DAC output pins; Adafruit states A0 and A1 can be used as 8-bit true analog outputs.
Type · analog io
A2-A5
Analogue input pins; Adafruit states A2 through A5 can be analog inputs.
Type · analog input
SCK
SPI clock pin on the ESP32-S2 high-speed peripheral.
Type · spi
MOSI
SPI microcontroller-out / sensor-in data pin.
Type · spi
MISO
SPI microcontroller-in / sensor-out data pin.
Type · spi
RX
UART receive pin; connect to TX on a sensor or breakout.
Type · uart
TX
UART transmit pin; connect to RX on a sensor or breakout.
Type · uart
SCL
I2C clock pin, shared by the STEMMA QT connector; Adafruit states there is a 5k pullup on this pin.
Type · i2c
SDA
I2C data pin, shared by the STEMMA QT connector; Adafruit states there is a 5k pullup on this pin.
Type · i2c
STEMMA QT
STEMMA QT connector uses board.SCL and board.SDA / board.STEMMA_I2C for I2C devices.
Type · i2c connector
I2C_POWER
I2C power control pin that must be pulled high for the STEMMA QT connector and the BME280 sensor, if present, to work properly; CircuitPython and Arduino do this automatically.
Type · power control
D5-D6, D9-D13
Digital pins; Adafruit notes D5, D6, D9 and D10 are on ADC1, and D11-D13 are on ADC2.
Type · digital io
Debug TX / DB
Hardware UART debug TX pin for ESP32 IDF low-level debug output; not the default Serial.print or CircuitPython print output.
Type · debug uart

Pin	Type	Function	Voltage
USB-C	power data	USB-C port used for both powering and programming the board; USB power also charges the LiPoly battery when connected.	USB 5V input from the USB-C jack when connected.
LiPoly JST 2-PH	power	2-pin JST-PH battery connector for a 3.7/4.2V LiPoly battery; can power the Feather and charge from USB.	3.7/4.2V LiPoly battery connection; Adafruit says use 250mAh or larger.
GND	ground	Common ground for power and logic.	0V common ground.
BAT	power	Positive voltage to/from the 2-pin JST jack for the optional LiPoly battery.	Battery positive, 3.7/4.2V LiPoly domain.
USB	power	Positive voltage to/from the USB-C jack when USB is connected.	USB positive voltage, nominal 5V.
EN	control	3.3V regulator enable; pulled up, connect to ground to disable the 3.3V regulator.	3.3V regulator enable logic.
3.3V	power	Output from the onboard 3.3V regulator; Adafruit states these pins can supply 500mA peak.	3.3V regulated output.
A0	analog io	Analog input and one of the only DAC output pins; Adafruit states A0 and A1 can be used as 8-bit true analog outputs.
A1	analog io	Analog input and one of the only DAC output pins; Adafruit states A0 and A1 can be used as 8-bit true analog outputs.
A2-A5	analog input	Analogue input pins; Adafruit states A2 through A5 can be analog inputs.
SCK	spi	SPI clock pin on the ESP32-S2 high-speed peripheral.
MOSI	spi	SPI microcontroller-out / sensor-in data pin.
MISO	spi	SPI microcontroller-in / sensor-out data pin.
RX	uart	UART receive pin; connect to TX on a sensor or breakout.
TX	uart	UART transmit pin; connect to RX on a sensor or breakout.
SCL	i2c	I2C clock pin, shared by the STEMMA QT connector; Adafruit states there is a 5k pullup on this pin.
SDA	i2c	I2C data pin, shared by the STEMMA QT connector; Adafruit states there is a 5k pullup on this pin.
STEMMA QT	i2c connector	STEMMA QT connector uses board.SCL and board.SDA / board.STEMMA_I2C for I2C devices.
I2C_POWER	power control	I2C power control pin that must be pulled high for the STEMMA QT connector and the BME280 sensor, if present, to work properly; CircuitPython and Arduino do this automatically.
D5-D6, D9-D13	digital io	Digital pins; Adafruit notes D5, D6, D9 and D10 are on ADC1, and D11-D13 are on ADC2.
Debug TX / DB	debug uart	Hardware UART debug TX pin for ESP32 IDF low-level debug output; not the default Serial.print or CircuitPython print output.

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