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.

ESP32

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Position

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.

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.

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.

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.

uart

UART receive pin; connect to TX on a sensor or breakout.

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.

Pinout

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