Adafruit ESP32-S2 Feather - 4MB Flash + 2MB PSRAM
2 grouped connections are listed in the table but omitted from the graphic until individual pins are available.
USB-C port used for powering and programming; charges the LiPoly battery when USB is plugged in.
Battery connector for a 250 mAh or larger 3.7/4.2 V LiPoly battery; can power the Feather and charge from USB.
Common ground for all power and logic.
Positive voltage to/from the 2-pin JST jack for the optional LiPoly battery.
Positive voltage to/from the USB-C jack when USB is connected.
3.3 V regulator enable; pulled up, connect to ground to disable the regulator.
Output from the 3.3 V regulator; Adafruit states it can supply 500 mA peak.
SPI clock pin on the ESP32-S2 high-speed peripheral.
SPI microcontroller-out / sensor-in data pin.
SPI microcontroller-in / sensor-out data pin.
UART receive pin; connect to the transmit pin on a sensor or breakout.
UART transmit pin; connect to the receive pin on a sensor or breakout.
I2C clock pin shared with the STEMMA QT connector; Adafruit states there is a 5 kΩ pull-up on this pin.
I2C data pin shared with the STEMMA QT connector; Adafruit states there is a 5 kΩ pull-up on this pin.
Power-control pin that must be pulled high for the STEMMA QT connector and onboard BME280, if present, to work; handled automatically by CircuitPython/Arduino.
Analogue input and one of the two DAC output pins on ADC2.
Analogue input and one of the two DAC output pins on ADC2.
Analogue input pins on ADC2.
Analogue input pin on ADC1.
Digital GPIO pins; Adafruit notes D5, D6, D9 and D10 are on ADC1, while D11-D13 are on ADC2.
Reset pin; tie to ground manually to reset the board.
Boot/DFU button input available as board.BUTTON in CircuitPython and pin 0 in Arduino; used with reset for ROM bootloader mode.
Hardware UART debug transmit pin for low-level ESP32-IDF debug output, not the default Serial/CircuitPython print output.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| USB-C | Power | USB-C port used for powering and programming; charges the LiPoly battery when USB is plugged in. | USB 5V input |
| LiPoly JST 2-PH | Power | Battery connector for a 250 mAh or larger 3.7/4.2 V LiPoly battery; can power the Feather and charge from USB. | 3.7/4.2V LiPoly |
| GND | Ground | Common ground for all power and logic. | 0V |
| BAT | Power | Positive voltage to/from the 2-pin JST jack for the optional LiPoly battery. | Battery voltage |
| USB | USB | Positive voltage to/from the USB-C jack when USB is connected. | USB voltage |
| EN | Control | 3.3 V regulator enable; pulled up, connect to ground to disable the regulator. | 3.3V logic |
| 3.3V | Power | Output from the 3.3 V regulator; Adafruit states it can supply 500 mA peak. | 3.3V output, 500mA peak |
| SCK | SPI | SPI clock pin on the ESP32-S2 high-speed peripheral. | 3.3V logic |
| MOSI | SPI | SPI microcontroller-out / sensor-in data pin. | 3.3V logic |
| MISO | SPI | SPI microcontroller-in / sensor-out data pin. | 3.3V logic |
| RX | UART | UART receive pin; connect to the transmit pin on a sensor or breakout. | 3.3V logic |
| TX | UART | UART transmit pin; connect to the receive pin on a sensor or breakout. | 3.3V logic |
| SCL | I2C | I2C clock pin shared with the STEMMA QT connector; Adafruit states there is a 5 kΩ pull-up on this pin. | 3.3V logic |
| SDA | I2C | I2C data pin shared with the STEMMA QT connector; Adafruit states there is a 5 kΩ pull-up on this pin. | 3.3V logic |
| I2C_POWER | Control | Power-control pin that must be pulled high for the STEMMA QT connector and onboard BME280, if present, to work; handled automatically by CircuitPython/Arduino. | 3.3V logic |
| A0 | Analog | Analogue input and one of the two DAC output pins on ADC2. | 3.3V logic/analogue |
| A1 | Analog | Analogue input and one of the two DAC output pins on ADC2. | 3.3V logic/analogue |
| A2-A4 | Analog | Analogue input pins on ADC2. | 3.3V logic/analogue |
| A5 | Analog | Analogue input pin on ADC1. | 3.3V logic/analogue |
| D5-D6, D9-D13 | GPIO | Digital GPIO pins; Adafruit notes D5, D6, D9 and D10 are on ADC1, while D11-D13 are on ADC2. | 3.3V logic |
| RST | Control | Reset pin; tie to ground manually to reset the board. | 3.3V logic |
| GPIO0BOOT | GPIO, Control | Boot/DFU button input available as board.BUTTON in CircuitPython and pin 0 in Arduino; used with reset for ROM bootloader mode. | 3.3V logic |
| Debug TXDB | UART | Hardware UART debug transmit pin for low-level ESP32-IDF debug output, not the default Serial/CircuitPython print output. | 3.3V logic |
2 grouped connections are omitted from the graphic until individual pins are available.
USB-C port used for powering and programming; charges the LiPoly battery when USB is plugged in.
Battery connector for a 250 mAh or larger 3.7/4.2 V LiPoly battery; can power the Feather and charge from USB.
Common ground for all power and logic.
Positive voltage to/from the 2-pin JST jack for the optional LiPoly battery.
Positive voltage to/from the USB-C jack when USB is connected.
3.3 V regulator enable; pulled up, connect to ground to disable the regulator.
Output from the 3.3 V regulator; Adafruit states it can supply 500 mA peak.
SPI clock pin on the ESP32-S2 high-speed peripheral.
SPI microcontroller-out / sensor-in data pin.
SPI microcontroller-in / sensor-out data pin.
UART receive pin; connect to the transmit pin on a sensor or breakout.
UART transmit pin; connect to the receive pin on a sensor or breakout.
I2C clock pin shared with the STEMMA QT connector; Adafruit states there is a 5 kΩ pull-up on this pin.
I2C data pin shared with the STEMMA QT connector; Adafruit states there is a 5 kΩ pull-up on this pin.
Power-control pin that must be pulled high for the STEMMA QT connector and onboard BME280, if present, to work; handled automatically by CircuitPython/Arduino.
Analogue input and one of the two DAC output pins on ADC2.
Analogue input and one of the two DAC output pins on ADC2.
Analogue input pins on ADC2.
Analogue input pin on ADC1.
Digital GPIO pins; Adafruit notes D5, D6, D9 and D10 are on ADC1, while D11-D13 are on ADC2.
Reset pin; tie to ground manually to reset the board.
Boot/DFU button input available as board.BUTTON in CircuitPython and pin 0 in Arduino; used with reset for ROM bootloader mode.
Hardware UART debug transmit pin for low-level ESP32-IDF debug output, not the default Serial/CircuitPython print output.
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