Component Pin Analysis

Thought for 2 mins 39 sec

I checked the module datasheet and extracted the pin groups you asked for. Per the recommended workflow, I used targeted datasheet queries by pin category rather than trying to infer from memory or a broad summary

Bootstrap / strapping pins

These are the boot-configuration pins called out in the datasheet:

Table

Pin name	Module pin #	Notes
IO0	4	Strapping pin
IO45	41	Strapping pin
IO46	44	Strapping pin

The datasheet section on boot configuration says:

boot mode uses GPIO0 and GPIO46
VDD_SPI voltage uses GPIO45
ROM message printing uses GPIO46

Input-only pins

From the extracted pin table, the only explicitly input-only GPIO is:

Table

Pin name	Module pin #	Notes
IO46	44	Type shown as I

Also input-only, but not general-purpose GPIO:

Table

Pin name	Module pin #	Notes
EN	45	Enable input, should not be left floating

Pins connected to internal memory

These module pins are shown with FSPI flash-interface functions:

Table

Pin name	Module pin #	Flash-related function
IO33	28	FSPIHD
IO34	29	FSPICS0
IO35	31	FSPID
IO36	32	FSPICLK
IO37	33	FSPIQ
IO38	34	FSPIWP

The datasheet explicitly notes:

Table

Pin name	Module pin #	Notes
IO26	26	Used by embedded PSRAM on ESP32-S2-MINI-2-N4R2 / -2U-N4R2, cannot be used for other purposes

Important nuance:

The extracted datasheet text explicitly says IO26 is unavailable on the PSRAM variants.
For IO33-IO38, the extracted text shows the flash-related functions, but the returned excerpt did not include an explicit “cannot be used” note for those pins, so I’m not going beyond what was directly returned.

USB pins

USB is present.

Table

Pin name	Module pin #	USB function
IO19	23	USB_D-
IO20	24	USB_D+

If you want, I can next turn this into a pin-property checklist for your part project, e.g.:

Pin Type
Section
Pin Group
Sub-symbol grouping

List selected Zone pins

Need exact pin names

Flag multifunction overlaps

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