Adafruit ESP32-C6 Feather - STEMMA QT

USB-C port
USB-C connector used for powering and programming the board; USB power charges the LiPoly battery when connected.
Type · power-dataVoltage · USB 5V input on USB pin when connected
LiPoly JST 2-PH
2-pin JST-PH connector for a 250mAh or larger 3.7/4.2V LiPoly battery; charges from USB when connected.
Type · powerVoltage · 3.7/4.2V LiPoly battery
GND
Common ground for power and logic.
Type · powerVoltage · 0V
BAT
Positive voltage to/from the 2-pin JST battery jack.
Type · powerVoltage · Battery positive, 3.7/4.2V LiPoly context
USB
Positive voltage to/from the USB-C jack when USB is connected.
Type · powerVoltage · USB 5V when connected

ESP32

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Wi-Fi and Bluetooth on a single chip, in every shape from Espressif DevKitC to Adafruit Feathers with STEMMA QT, DFRobot FireBeetles tuned for battery life, and Seeed XIAOs under a thumbnail.

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Position

Type

Function

Voltage

USB-C port

power-data

USB-C connector used for powering and programming the board; USB power charges the LiPoly battery when connected.

USB 5V input on USB pin when connected

LiPoly JST 2-PH

power

2-pin JST-PH connector for a 250mAh or larger 3.7/4.2V LiPoly battery; charges from USB when connected.

3.7/4.2V LiPoly battery

GND

power

Common ground for power and logic.

BAT

power

Positive voltage to/from the 2-pin JST battery jack.

Battery positive, 3.7/4.2V LiPoly context

USB

power

Positive voltage to/from the USB-C jack when USB is connected.

USB 5V when connected

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 3.3V regulator; Adafruit states the pins can supply 500mA peak.

3.3V output, 500mA peak

A0-A5

analog-gpio

Six analog-capable Feather pins; the ESP32-C6 Feather does not have a DAC, so no true analogue output.

3.3V logic

SCK

spi

SPI clock pin, mapped to ESP32-C6 IO21.

3.3V logic

MOSI

spi

SPI microcontroller out / sensor in pin, mapped to ESP32-C6 IO22.

3.3V logic

MISO

spi

SPI microcontroller in / sensor out pin, mapped to ESP32-C6 IO23.

3.3V logic

uart

UART receive pin, mapped to ESP32-C6 IO17; connect to TX on the other device.

3.3V logic

uart

UART transmit pin, mapped to ESP32-C6 IO16; connect to RX on the other device.

3.3V logic

SCL

i2c

I2C clock pin, mapped to ESP32-C6 IO18, shared by the STEMMA QT connector and has a 5k pullup.

3.3V logic with pullup

SDA

i2c

I2C data pin, mapped to ESP32-C6 IO19, shared by the STEMMA QT connector and has a 5k pullup.

3.3V logic with pullup

STEMMA QT

connector

JST SH 4-pin STEMMA QT connector breaking out I2C SCL, SDA, 3.3V, and GND.

3.3V I2C connector

NEOPIXEL_I2C_POWER / IO20

control

Power-control pin that must be pulled high for the STEMMA QT connector and onboard NeoPixel power.

3.3V logic control

IO0, IO5-IO9, IO12, IO15

gpio

Digital pins; IO9 is shared with the Boot button and onboard NeoPixel, IO6 with A2, and IO5 with A3.

3.3V logic

NeoPixel / IO9

led-gpio

Onboard RGB NeoPixel LED labelled Neo; controlled from IO9 and shared with the Boot button.

3.3V logic control

Red LED / IO15

led-gpio

Onboard red LED labelled 15, controllable in code as board.LED / LED_BUILTIN / 15.

3.3V logic control

RST

reset

Reset pin tied to the reset button; tie to ground manually to reset the board.

3.3V logic reset

Boot / IO9

button-gpio

Boot button input connected to IO9; also used for ROM bootloader mode and shared with the onboard NeoPixel.

3.3V logic input with pullup use

Pinout

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