| 1 | Power | VOTG | 1A | VOTG | - | Supply rail of the USB-A plug, provides 5 volt if OTG boost is enabled or voltage of VSYS when OTG boost is disabled |
| 2 | USB | USB-C VBUS | - | HUB_USB1_P | - | USB port 4 on the internal USB hub, allows add-ons to make a device available to the host PC via the USB-C port |
| 3 | Power | VBATT (~3.7v) | 1A | VBATT | - | Direct connection to the Lithium Polymer battery, can also be used to supply current to the device if (AND ONLY IF) there is no battery connected to the battery connector |
| 4 | USB | 3.3v | - | HUB_USB1_N | - | USB port 4 on the internal USB hub, allows add-ons to make a device available to the host PC via the USB-C port |
| 5 | Power | VSYS (~3.7-5v) | 1A | VSYS | - | Same as VBATT but switched by the PMIC, turns off when the device is turned off via the soft power on/off feature |
| 6 | Power | GND | - | GND | - | Ground, voltage reference for all supply rails |
| 7 | Power | GND | - | GND | - | Ground, voltage reference for all supply rails |
| 8 | Power | 3.3v | 1A | +3.3V | - | Regulated 3.3v rail |
| 9 | I2C | 3.3v | 40mA source, 28mA sink | INT_SCL | 10 | Internal I2C bus SCL signal, can only be used for I2C communication. We recommend connecting an EEPROM for add-on identification to this bus |
| 10 | I2C | 3.3v | 40mA source, 28mA sink | INT_SDA | 9 | Internal I2C bus SDA signal, can only be used for I2C communication. We recommend connecting an EEPROM for add-on identification to this bus |
| 11 | GPIO | 3.3v | 40mA source, 28mA sink | E0 | 36 | GPIO, needs to remain HIGH level (4.7k pull-up on the mainboard) for USB firmware download boot option to function |
| 12 | GPIO | 3.3v | 40mA source, 28mA sink | E2 | 0 | GPIO |
| 13 | Power | VSDCARD | 50mA | VSDCARD | - | Supply rail for the micro SD card socket and some GPIO pins, can either be off, 3.3v or 1.8v depending on card type and communication speed and configuration in software |
| 14 | GPIO | VSDCARD | 40mA source, 28mA sink (limited by supply rail) | E3 | 45 | GPIO, uses VSDCARD supply rail! |
| 15 | GPIO | VSDCARD | 40mA source, 28mA sink (limited by supply rail) | E4 | 48 | GPIO, uses VSDCARD supply rail! |
| 16 | GPIO | VSDCARD | 40mA source, 28mA sink (limited by supply rail) | E5 | 47 | GPIO, uses VSDCARD supply rail! |
| 17 | GPIO | VSDCARD | 40mA source, 28mA sink (limited by supply rail) | E6 | 46 | GPIO, uses VSDCARD supply rail! |
| 18 | GPIO | 3.3v | 40mA source, 28mA sink | EXT_INT | 7 | GPIO, connected to GPIO in low power domain: can be used to wake up the ESP32-P4 from deep sleep, if the add-on requires an interrupt pin we recommend connecting it here, otherwise this pin can be used like any other GPIO |
| 19 | GPIO | 3.3v | 40mA source, 28mA sink | E12 | 54 | GPIO |
| 20 | GPIO | 3.3v | 40mA source, 28mA sink | E7 | 49 | GPIO |
| 21 | GPIO | 3.3v | 40mA source, 28mA sink | E11 | 53 | GPIO |
| 22 | GPIO | 3.3v | 40mA source, 28mA sink | EXT_USB_P | 27 | GPIO, USB full-speed PHY D+: can be used as either normal GPIO or to connect an USB device to the ESP32-P4 |
| 23 | GPIO | 3.3v | 40mA source, 28mA sink | E10 | 52 | GPIO |
| 24 | GPIO | 3.3v | 40mA source, 28mA sink | EXT_USB_N | 26 | GPIO, USB full-speed PHY D-: can be used as either normal GPIO or to connect an USB device to the ESP32-P4 |
| 25 | GPIO | 3.3v | 40mA source, 28mA sink | E9 | 51 | GPIO |
| 26 | GPIO | 3.3v | 40mA source, 28mA sink | P4_TX | 37 | GPIO |
| 27 | GPIO | 3.3v | 40mA source, 28mA sink | E8 | 50 | GPIO |
| 28 | GPIO | 3.3v | 40mA source, 28mA sink | P4_RX | 38 | GPIO |
| 29 | GPIO | 3.3v | 40mA source, 28mA sink | I2S_MCLK | 30 | GPIO |
| 30 | GPIO | 3.3v | 40mA source, 28mA sink | I2S_LRCK | 31 | GPIO |
| 31 | GPIO | 3.3v | 40mA source, 28mA sink | I2S_DATA | 28 | GPIO |
| 32 | GPIO | 3.3v | 40mA source, 28mA sink | I2S_SCLK | 29 | GPIO |
| 33 | Power | 3.3v | 1A | +3.3V | - | Regulated 3.3v rail |
| 34 | GPIO | 3.3v | 40mA source, 28mA sink | I3C_SDA | 33 | GPIO, connected to the QWIIC connector, I3C peripheral SDA pin |
| 35 | Power | GND | - | GND | - | Ground, voltage reference for all supply rails |
| 36 | GPIO | 3.3v | 40mA source, 28mA sink | I3C_SCL | 32 | GPIO, connected to the QWIIC connector, I3C peripheral SCL pin |