Pin Classification and Function Summary

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1:04

Considering file usage.

Deciding on citations.

Considering input types.

Espressif encountered an error.

From the datasheet and Espressif pin notes for this module, here are the pin groups you asked for:
Bootstrap / strapping pins
These are sampled at reset, then can act as normal IO afterward:
  • IO0 / GPIO0 — pin 3
    • Boot mode strap
    • Default internal pull-up
  • IO45 / GPIO45 — pin 39
    • VDD_SPI voltage strap
    • Default internal pull-down
  • IO46 / GPIO46 — pin 40
    • Boot mode strap
    • ROM message printing strap
    • Default internal pull-down
Boot-mode detail:
  • SPI boot: GPIO0 = 1, GPIO46 = any
  • Download boot: GPIO0 = 0, GPIO46 = 0
  • Avoid: GPIO0 = 0, GPIO46 = 1
Input-only pins GPIO input-only
  • IO46 / GPIO46 — pin 40
    • Explicitly listed as input only
Dedicated input pin
  • EN — pin 41
    • Chip enable input
    • Not a general-purpose GPIO
    • Must not be left floating
Pins connected to internal memory
These are the exposed module pins tied to the internal flash/PSRAM interface, so they should be treated as reserved rather than general-purpose IO:
  • IO26 / GPIO26 — pin 25
    • Connected to PSRAM CS
    • Datasheet says it cannot be used for other functions
  • IO33 / GPIO33 — pin 27
    • Memory interface signal
  • IO34 / GPIO34 — pin 28
    • Memory interface signal
  • IO35 / GPIO35 — pin 29
    • Memory interface signal
  • IO36 / GPIO36 — pin 30
    • Memory interface signal
  • IO37 / GPIO37 — pin 31
    • Memory interface signal
  • IO38 / GPIO38 — pin 32
    • Memory interface signal
Practical takeaway:
  • Definitely reserved: IO26
  • Also normally reserved / use with caution: IO33 to IO38
  • Espressif also notes the SPI0/1 memory bus pins are usually not recommended for other use.
USB pins
Yes, USB is present:
  • IO19 / GPIO19 — pin 22 — USB_D-
  • IO20 / GPIO20 — pin 23 — USB_D+
If you want, I can turn this into a pin classification table for the whole module next, including:
  • power pins
  • ground pins
  • strap pins
  • reserved memory pins
  • USB/UART/JTAG pins
  • safe general-purpose IO pins
Use attached datasheet
Add exact part number
Include pin numbers
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