The {IDF_TARGET_NAME} chip features 34 physical GPIO pads. Some GPIO pads cannot be used or do not have the corresponding pin on the chip package. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__].
Each pad can be used as a general purpose I/O or can be connected to an internal peripheral signal. The table below provides more information on pin usage, and please note the comments in the table for GPIOs with restrictions.
- Strapping pin: GPIO0, GPIO2, GPIO5, GPIO12 (MTDI), and GPIO15 (MTDO) are strapping pins. For more infomation, please refer to `ESP32 datasheet <https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf>`_.
- SPI0/1: GPIO6-11 and GPIO16-17 are usually connected to the SPI flash and PSRAM integrated on the module and therefore should not be used for other purposes.
- JTAG: GPIO12-15 are usually used for inline debug.
- GPI: GPIO34-39 can only be set as input mode and do not have software-enabled pullup or pulldown functions.
- TXD & RXD are usually used for flashing and debugging.
- ADC2: ADC2 pins cannot be used when Wi-Fi is used. So, if you’re using Wi-Fi and you’re having trouble getting the value from an ADC2 GPIO, you may consider using an ADC1 GPIO instead, that should solve your problem. For more details, please refer to `ADC limitations <https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/adc.html#adc-limitations>`_.
The {IDF_TARGET_NAME} chip features 43 physical GPIO pads. Some GPIO pads cannot be used or do not have the corresponding pin on the chip package. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__]. Each pad can be used as a general purpose I/O or can be connected to an internal peripheral signal.
The table below provides more information on pin usage, and please note the comments in the table for GPIOs with restrictions.
..list-table::
:header-rows:1
:widths:8 12 12 20
* - GPIO
- Analog Function
- RTC GPIO
- Comment
* - GPIO0
-
- RTC_GPIO0
- Strapping pin
* - GPIO1
- ADC1_CH0
- RTC_GPIO1
-
* - GPIO2
- ADC1_CH1
- RTC_GPIO2
-
* - GPIO3
- ADC1_CH2
- RTC_GPIO3
-
* - GPIO4
- ADC1_CH3
- RTC_GPIO4
-
* - GPIO5
- ADC1_CH4
- RTC_GPIO5
-
* - GPIO6
- ADC1_CH5
- RTC_GPIO6
-
* - GPIO7
- ADC1_CH6
- RTC_GPIO7
-
* - GPIO8
- ADC1_CH7
- RTC_GPIO8
-
* - GPIO9
- ADC1_CH8
- RTC_GPIO9
-
* - GPIO10
- ADC1_CH9
- RTC_GPIO10
-
* - GPIO11
- ADC2_CH0
- RTC_GPIO11
-
* - GPIO12
- ADC2_CH1
- RTC_GPIO12
-
* - GPIO13
- ADC2_CH2
- RTC_GPIO13
-
* - GPIO14
- ADC2_CH3
- RTC_GPIO14
-
* - GPIO15
- ADC2_CH4
- RTC_GPIO15
-
* - GPIO16
- ADC2_CH5
- RTC_GPIO16
-
* - GPIO17
- ADC2_CH6
- RTC_GPIO17
-
* - GPIO18
- ADC2_CH7
- RTC_GPIO18
-
* - GPIO19
- ADC2_CH8
- RTC_GPIO19
-
* - GPIO20
- ADC2_CH9
- RTC_GPIO20
-
* - GPIO21
-
- RTC_GPIO21
-
* - GPIO26
-
-
- SPI0/1
* - GPIO27
-
-
- SPI0/1
* - GPIO28
-
-
- SPI0/1
* - GPIO29
-
-
- SPI0/1
* - GPIO30
-
-
- SPI0/1
* - GPIO31
-
-
- SPI0/1
* - GPIO32
-
-
- SPI0/1
* - GPIO33
-
-
-
* - GPIO34
-
-
-
* - GPIO35
-
-
-
* - GPIO36
-
-
-
* - GPIO37
-
-
-
* - GPIO38
-
-
-
* - GPIO39
-
-
- JTAG
* - GPIO40
-
-
- JTAG
* - GPIO41
-
-
- JTAG
* - GPIO42
-
-
- JTAG
* - GPIO43
-
-
-
* - GPIO44
-
-
-
* - GPIO45
-
-
- Strapping pin
* - GPIO46
-
-
- GPI；Strapping pin
..note::
- Strapping pin: GPIO0, GPIO45 and GPIO46 are strapping pins. For more infomation, please refer to `ESP32-S2 datasheet <https://www.espressif.com/sites/default/files/documentation/esp32-s2_datasheet_en.pdf>`_
- SPI0/1: GPIO26-32 are usually used for SPI flash and PSRAM and not recommended for other uses.
- JTAG: GPIO39-42 are usually used for inline debug.
- GPI: GPIO46 is fixed to pull-down and is input only.
The {IDF_TARGET_NAME} chip features 22 physical GPIO pads. Some GPIO pads cannot be used or do not have the corresponding pin on the chip package. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__]. Each pad can be used as a general purpose I/O or can be connected to an internal peripheral signal.
The table below provides more information on pin usage, and please note the comments in the table for GPIOs with restrictions.
..list-table::
:header-rows:1
:widths:12 12 22
* - GPIO
- Analog Function
- Comment
* - GPIO0
- ADC1_CH0
- RTC
* - GPIO1
- ADC1_CH1
- RTC
* - GPIO2
- ADC1_CH2
- Strapping pin；RTC
* - GPIO3
- ADC1_CH3
- RTC
* - GPIO4
- ADC1_CH4
- RTC
* - GPIO5
- ADC2_CH0
- RTC
* - GPIO6
-
-
* - GPIO7
-
-
* - GPIO8
-
- Strapping pin
* - GPIO9
-
- Strapping pin
* - GPIO10
-
-
* - GPIO11
-
-
* - GPIO12
-
- SPI0/1
* - GPIO13
-
- SPI0/1
* - GPIO14
-
- SPI0/1
* - GPIO15
-
- SPI0/1
* - GPIO16
-
- SPI0/1
* - GPIO17
-
- SPI0/1
* - GPIO18
-
- USB-JTAG
* - GPIO19
-
- USB-JTAG
* - GPIO20
-
-
* - GPIO21
-
-
..note::
- Strapping pin: GPIO2, GPIO8 and GPIO9 are strapping pins. For more infomation, please refer to `ESP32-C3 datasheet <https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf>`_.
- SPI0/1: GPIO12-17 are usually used for SPI flash and PSRAM and not recommended for other uses.
- USB-JTAG: GPIO 18 and 19 are used by USB-JTAG by default. In order to use them as GPIOs, USB-JTAG will be disabled by the drivers.
The {IDF_TARGET_NAME} chip features 45 physical GPIO pads. Some GPIO pads cannot be used or do not have the corresponding pin on the chip package. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__]. Each pad can be used as a general purpose I/O or can be connected to an internal peripheral signal.
The table below provides more information on pin usage, and please note the comments in the table for GPIOs with restrictions.
..list-table::
:header-rows:1
:widths:8 12 12 20
* - GPIO
- Analog Function
- RTC GPIO
- Comment
* - GPIO0
-
- RTC_GPIO0
- Strapping pin
* - GPIO1
- ADC1_CH0
- RTC_GPIO1
-
* - GPIO2
- ADC1_CH1
- RTC_GPIO2
-
* - GPIO3
- ADC1_CH2
- RTC_GPIO3
- Strapping pin
* - GPIO4
- ADC1_CH3
- RTC_GPIO4
-
* - GPIO5
- ADC1_CH4
- RTC_GPIO5
-
* - GPIO6
- ADC1_CH5
- RTC_GPIO6
-
* - GPIO7
- ADC1_CH6
- RTC_GPIO7
-
* - GPIO8
- ADC1_CH7
- RTC_GPIO8
-
* - GPIO9
- ADC1_CH8
- RTC_GPIO9
-
* - GPIO10
- ADC1_CH9
- RTC_GPIO10
-
* - GPIO11
- ADC2_CH0
- RTC_GPIO11
-
* - GPIO12
- ADC2_CH1
- RTC_GPIO12
-
* - GPIO13
- ADC2_CH2
- RTC_GPIO13
-
* - GPIO14
- ADC2_CH3
- RTC_GPIO14
-
* - GPIO15
- ADC2_CH4
- RTC_GPIO15
-
* - GPIO16
- ADC2_CH5
- RTC_GPIO16
-
* - GPIO17
- ADC2_CH6
- RTC_GPIO17
-
* - GPIO18
- ADC2_CH7
- RTC_GPIO18
-
* - GPIO19
- ADC2_CH8
- RTC_GPIO19
- USB-JTAG
* - GPIO20
- ADC2_CH9
- RTC_GPIO20
- USB-JTAG
* - GPIO21
-
- RTC_GPIO21
-
* - GPIO26
-
-
- SPI0/1
* - GPIO27
-
-
- SPI0/1
* - GPIO28
-
-
- SPI0/1
* - GPIO29
-
-
- SPI0/1
* - GPIO30
-
-
- SPI0/1
* - GPIO31
-
-
- SPI0/1
* - GPIO32
-
-
- SPI0/1
* - GPIO33
-
-
- SPI0/1
* - GPIO34
-
-
- SPI0/1
* - GPIO35
-
-
- SPI0/1
* - GPIO36
-
-
- SPI0/1
* - GPIO37
-
-
- SPI0/1
* - GPIO38
-
-
-
* - GPIO39
-
-
-
* - GPIO40
-
-
-
* - GPIO41
-
-
-
* - GPIO42
-
-
-
* - GPIO43
-
-
-
* - GPIO44
-
-
-
* - GPIO45
-
-
- Strapping pin
* - GPIO46
-
-
- Strapping pin
* - GPIO47
-
-
-
* - GPIO48
-
-
-
..Note::
- Strapping pin: GPIO0, GPIO3, GPIO45 and GPIO46 are strapping pins.
- SPI0/1: GPIO26-32 are usually used for SPI flash and PSRAM and not recommended for other uses. When using Octal Flash or Octal PSRAM or both, GPIO33~37 are connected to SPIIO4 ~ SPIIO7 and SPIDQS. Therefore on ESP32-S3R8 / ESP32-S3R8V board GPIO33~37 are also not recommended for other uses.
- USB-JTAG: GPIO 19 and 20 are used by USB-JTAG by default. In order to use them as GPIOs, USB-JTAG will be disabled by the drivers.
There is also separate "RTC GPIO" support, which functions when GPIOs are routed to the "RTC" low-power and analog subsystem. These pin functions can be used when:
..list::
- In deep sleep
:SOC_ULP_SUPPORTED:- The :doc:`Ultra Low Power co-processor <../../api-guides/ulp>` is running
- Analog functions such as ADC/DAC/etc are in use.
