Component Pin Overview

flux

1:33

Clarifying datasheet checks.

Searching web for: "ESP32-WROOM-32UE datasheet GPIO strapping pins GPIO34 GPIO35 GPIO36 GPIO39 input only GPIO6 GPIO7 GPIO8 GPIO9 GPIO10 GPIO11 USB pins site:espressif.com"

Found 1 results.

Looking for "List the strapping or bootstrap pins, input-only GPIOs, pins connected to internal SPI flash or internal memory, and whether USB pins are present." in esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf

From the datasheet for this module, here are the pin groups you asked for:
Bootstrap / strapping pins
These are sampled at power-up / hardware reset to set boot behavior and related configuration:

Table

Module pinSignal nameGPIO
14IO12 / MTDIGPIO12
23IO15 / MTDOGPIO15
24IO2GPIO2
25IO0GPIO0
29IO5GPIO5
The datasheet specifically lists 5 strapping GPIOs and names them as GPIO0, GPIO2, MTDI, MTDO, and GPIO5.
Input-only pins
These are not general bidirectional GPIOs:

Table

Module pinSignal nameGPIO
4SENSOR_VPGPIO36
5SENSOR_VNGPIO39
6IO34GPIO34
7IO35GPIO35
In the pin table, these are marked as I rather than I/O.
Pins connected to internal memory Connected to internal SPI flash
The datasheet says GPIO6 to GPIO11 on the ESP32 chip are connected to the module’s integrated SPI flash and are not led out to module pins.

Table

Chip GPIOStatus
GPIO6Connected to internal SPI flash, not led out
GPIO7Connected to internal SPI flash, not led out
GPIO8Connected to internal SPI flash, not led out
GPIO9Connected to internal SPI flash, not led out
GPIO10Connected to internal SPI flash, not led out
GPIO11Connected to internal SPI flash, not led out
PSRAM-related note
The datasheet also notes that IO16 / GPIO16 is connected to embedded PSRAM only on module variants that include embedded QSPI PSRAM. For those variants, it cannot be used for other functions.

Table

Module pinSignal nameGPIONote
27IO16GPIO16Reserved only on PSRAM-equipped variants
USB pins
  • No native USB pins are present
  • The retrieved pin definitions do not include USB_DP, USB_DM, or any USB interface pins
  • So for this module, USB is not available as a native peripheral on the module pins
Quick summary
  • Bootstrap pins: GPIO0, GPIO2, GPIO5, GPIO12, GPIO15
  • Input-only pins: GPIO34, GPIO35, GPIO36, GPIO39
  • Internal flash pins: GPIO6 to GPIO11, not exposed
  • USB pins: none
If you want, I can also make the next list for:
  • safe general-purpose GPIOs
  • ADC-capable pins
  • pins to avoid during boot
List safe GPIOs
Show boot-sensitive pins
List ADC pins
Review pull resistors
2 days
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    ESP32-WROOM-32UE 3D Model.STEP

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    ESP32-WROOM-32

    ESP32-WROOM-32

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    ESP32-WROOM-32UE-removebg-preview.png

    ESP32-WROOM-32UE-removebg-preview.png

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    ESP32-WROOM-32UE

    ESP32-WROOM-32UE thumbnail
    Bluetooth, WiFi 802.11b/g/n, Bluetooth v4.2 +EDR, Class 1, 2 and 3 Transceiver Module 2.4GHz ~ 2.5GHz Antenna Not Included, U.FL Surface Mount #RF #wifi #ESP32 #CommonPartsLibrary #MCU #module

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    Espressif Systems

    ESP32-WROOM-32UE

    espressif.com/sites/default/files/documentation/esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf

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    creativecommons.org/licenses/by/4.0/

    parametric-v1

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