Component Pin Classification

flux

1:25

Revising search strategy.

Espressif encountered an error.

From the Espressif datasheet for this module, here are the pin groups you asked for:
Bootstrap pins
These are the module strapping pins used at reset:
  • IO0 - module pin 27
  • IO45 - module pin 26
  • IO46 - module pin 16
What they control:
  • IO0 + IO46: boot mode
  • IO45: VDD_SPI voltage selection
  • IO46: ROM message printing
Input-only pins
  • IO46 - module pin 16 - type I
That is the only pin in the module pin table marked input-only.
USB pins
  • IO19 - module pin 13 - USB_D-
  • IO20 - module pin 14 - USB_D+
Pins connected to internal memory
There are two useful interpretations here:
1. Exposed module pins with memory-bus-related functions
These pins are labeled with FSPI/SPIIO functions in the module pin table:
  • IO9 - pin 17 - FSPIHD
  • IO10 - pin 18 - FSPICS0 / FSPIIO4
  • IO11 - pin 19 - FSPID / FSPIIO5
  • IO12 - pin 20 - FSPICLK / FSPIIO6
  • IO13 - pin 21 - FSPIQ / FSPIIO7
  • IO14 - pin 22 - FSPIWP / FSPIDQS
  • IO33 - pin 24 - SPIIO4 / FSPIHD
  • IO34 - pin 25 - SPIIO5 / FSPICS0
  • IO35 - pin 28 - SPIIO6 / FSPID
  • IO36 - pin 29 - SPIIO7 / FSPICLK
  • IO37 - pin 30 - SPIDQS / FSPIQ
  • IO38 - pin 31 - FSPIWP
2. Pins actually reserved on the chip side for in-package flash/PSRAM
The ESP32-S2 chip datasheet says the pins allocated for communication with in-package flash/PSRAM should not be used for other purposes. On the chip, these are the dedicated SPI memory pins such as:
  • SPICS0
  • SPIHD
  • SPIWP
  • SPICLK
  • SPIQ
  • SPID
  • and, for wider memory modes, GPIO33-GPIO37
On the module, the always-reserved internal flash connections are generally internalized rather than simply exposed as ordinary user pins, so if your goal is a safe "do not use casually" list, the cautious exposed-pin set is:

Table

CategoryPins
Definitely strapping-sensitiveIO0, IO45, IO46
USB-fixed by defaultIO19, IO20
Memory-related / use with cautionIO33, IO34, IO35, IO36, IO37
Memory-bus alt-function pins also shown in pin tableIO9, IO10, IO11, IO12, IO13, IO14, IO38
If you want, I can also turn this into a clean Flux terminal classification table with columns like Pin Name / Pin Number / Pin Type / Section / Pin Group / Notes for your part project.
List EPAD pin groups
Include exact pin names
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    ESP32-S2-SOLO-U-N4

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    ESP32-S2-SOLO-2U

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    WiFi 802.11b/g/n Transceiver Module 2.4GHz Antenna Not Included, U.FL Surface Mount #RF #wifi #ESP32S2 #CommonPartsLibrary #MCU #module

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    ESP32-S2-SOLO-2U

    espressif.com/sites/default/files/documentation/esp32-s2-solo-2_esp32-s2-solo-2u_datasheet_en.pdf

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