Adafruit ESP32-C6 Feather - STEMMA QT
2 grouped connections are listed in the table but omitted from the graphic until individual pins are available.
USB-C connector used for powering and programming the board; USB power charges the LiPoly battery when connected.
2-pin JST-PH connector for a 250mAh or larger 3.7/4.2V LiPoly battery; charges from USB when connected.
Common ground for power and logic.
Positive voltage to/from the 2-pin JST battery jack.
Positive voltage to/from the USB-C jack when USB is connected.
3.3V regulator enable; pulled up, connect to ground to disable the 3.3V regulator.
Output from the 3.3V regulator; Adafruit states the pins can supply 500mA peak.
Six analog-capable Feather pins; the ESP32-C6 Feather does not have a DAC, so no true analogue output.
SPI clock pin, mapped to ESP32-C6 IO21.
SPI microcontroller out / sensor in pin, mapped to ESP32-C6 IO22.
SPI microcontroller in / sensor out pin, mapped to ESP32-C6 IO23.
UART receive pin, mapped to ESP32-C6 IO17; connect to TX on the other device.
UART transmit pin, mapped to ESP32-C6 IO16; connect to RX on the other device.
I2C clock pin, mapped to ESP32-C6 IO18, shared by the STEMMA QT connector and has a 5k pullup.
I2C data pin, mapped to ESP32-C6 IO19, shared by the STEMMA QT connector and has a 5k pullup.
JST SH 4-pin STEMMA QT connector breaking out I2C SCL, SDA, 3.3V, and GND.
Power-control pin that must be pulled high for the STEMMA QT connector and onboard NeoPixel power.
Digital pins; IO9 is shared with the Boot button and onboard NeoPixel, IO6 with A2, and IO5 with A3.
Onboard RGB NeoPixel LED labelled Neo; controlled from IO9 and shared with the Boot button.
Onboard red LED labelled 15, controllable in code as board.LED / LED_BUILTIN / 15.
Reset pin tied to the reset button; tie to ground manually to reset the board.
Boot button input connected to IO9; also used for ROM bootloader mode and shared with the onboard NeoPixel.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| USB-C port | Power | 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 | Ground | Common ground for power and logic. | 0V |
| BAT | Power | Positive voltage to/from the 2-pin JST battery jack. | Battery positive, 3.7/4.2V LiPoly context |
| USB | USB | Positive voltage to/from the USB-C jack when USB is connected. | USB 5V when connected |
| 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 3.3V regulator; Adafruit states the pins can supply 500mA peak. | 3.3V output, 500mA peak |
| A0-A5 | Analog | Six analog-capable Feather pins; the ESP32-C6 Feather does not have a DAC, so no true analogue output. | 3.3V logic |
| IO21SCK | GPIO, SPI | SPI clock pin, mapped to ESP32-C6 IO21. | 3.3V logic |
| IO22MOSI | GPIO, SPI | SPI microcontroller out / sensor in pin, mapped to ESP32-C6 IO22. | 3.3V logic |
| IO23MISO | GPIO, SPI | SPI microcontroller in / sensor out pin, mapped to ESP32-C6 IO23. | 3.3V logic |
| IO17RX | GPIO, UART | UART receive pin, mapped to ESP32-C6 IO17; connect to TX on the other device. | 3.3V logic |
| IO16TX | GPIO, UART | UART transmit pin, mapped to ESP32-C6 IO16; connect to RX on the other device. | 3.3V logic |
| IO18SCL | GPIO, 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 |
| IO19SDA | GPIO, 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 | Unknown | JST SH 4-pin STEMMA QT connector breaking out I2C SCL, SDA, 3.3V, and GND. | 3.3V I2C connector |
| IO20NEOPIXEL_I2C_POWER | GPIO, 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 |
| IO9NeoPixel | GPIO, USB | Onboard RGB NeoPixel LED labelled Neo; controlled from IO9 and shared with the Boot button. | 3.3V logic control |
| IO15Red LED | GPIO, USB | Onboard red LED labelled 15, controllable in code as board.LED / LED_BUILTIN / 15. | 3.3V logic control |
| RST | Control | Reset pin tied to the reset button; tie to ground manually to reset the board. | 3.3V logic reset |
| IO9Boot | GPIO, Control | 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 |
2 grouped connections are omitted from the graphic until individual pins are available.
USB-C connector used for powering and programming the board; USB power charges the LiPoly battery when connected.
2-pin JST-PH connector for a 250mAh or larger 3.7/4.2V LiPoly battery; charges from USB when connected.
Common ground for power and logic.
Positive voltage to/from the 2-pin JST battery jack.
Positive voltage to/from the USB-C jack when USB is connected.
3.3V regulator enable; pulled up, connect to ground to disable the 3.3V regulator.
Output from the 3.3V regulator; Adafruit states the pins can supply 500mA peak.
Six analog-capable Feather pins; the ESP32-C6 Feather does not have a DAC, so no true analogue output.
SPI clock pin, mapped to ESP32-C6 IO21.
SPI microcontroller out / sensor in pin, mapped to ESP32-C6 IO22.
SPI microcontroller in / sensor out pin, mapped to ESP32-C6 IO23.
UART receive pin, mapped to ESP32-C6 IO17; connect to TX on the other device.
UART transmit pin, mapped to ESP32-C6 IO16; connect to RX on the other device.
I2C clock pin, mapped to ESP32-C6 IO18, shared by the STEMMA QT connector and has a 5k pullup.
I2C data pin, mapped to ESP32-C6 IO19, shared by the STEMMA QT connector and has a 5k pullup.
JST SH 4-pin STEMMA QT connector breaking out I2C SCL, SDA, 3.3V, and GND.
Power-control pin that must be pulled high for the STEMMA QT connector and onboard NeoPixel power.
Digital pins; IO9 is shared with the Boot button and onboard NeoPixel, IO6 with A2, and IO5 with A3.
Onboard RGB NeoPixel LED labelled Neo; controlled from IO9 and shared with the Boot button.
Onboard red LED labelled 15, controllable in code as board.LED / LED_BUILTIN / 15.
Reset pin tied to the reset button; tie to ground manually to reset the board.
Boot button input connected to IO9; also used for ROM bootloader mode and shared with the onboard NeoPixel.
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