Component Pin Overview

flux

1:16

Considering tools for data retrieval.

Examining SPI mode details.

Espressif encountered an error.

I checked the Espressif datasheet and pin-definition docs for this module.

Bootstrap / strapping pins

These are the pins sampled at reset for boot/config behavior:

Table

Pin name	Pin no.	Purpose	Default strap
GPIO0 / IO0	4	Boot mode select	Weak pull-up = 1
GPIO45 / IO45	41	VDD_SPI voltage select	Weak pull-down = 0
GPIO46 / IO46	44	Boot mode / ROM message printing	Weak pull-down = 0

From the boot configuration tables:

GPIO0 + GPIO46 control boot mode
- SPI boot: GPIO0 = 1, GPIO46 = don't care
- Download boot: GPIO0 = 0, GPIO46 = 0
- GPIO0 = 0, GPIO46 = 1 is an invalid combination and should be avoided.
GPIO45 controls VDD_SPI strap behavior.
GPIO46 also affects ROM boot message printing.

Input-only pins

For normal GPIO use, the only input-only GPIO called out is:

Table

Pin name	Pin no.	Notes
GPIO46 / IO46	44	Input-only GPIO, also a strapping pin

Also worth noting:

EN is pin 45 and is an input used to enable/power the chip, but it is not a general-purpose GPIO.

Pins connected to internal memory / flash interface

These are the pins associated with the SPI0/1 flash/PSRAM memory interface or called out as restricted for memory use:

Direct memory-interface / reserved-use category

Pin name	Pin no.	Memory-related function
GPIO26 / IO26	26	`SPICS1`; datasheet notes this pin is used by embedded PSRAM on N4R2 variants
GPIO33 / IO33	28	`SPIIO4`, `FSPIHD`
GPIO34 / IO34	29	`SPIIO5`, `FSPICS0`
GPIO35 / IO35	31	`SPIIO6`, `FSPID`
GPIO36 / IO36	32	`SPIIO7`, `FSPICLK`
GPIO37 / IO37	33	`SPIDQS`, `FSPIQ`
GPIO38 / IO38	34	`FSPIWP`

Important nuance:

Espressif marks GPIO26-32 as the SPI0/1 interface used for in-package flash/PSRAM or recommended for off-package memory on the ESP32-S2 family.
On this module’s exposed pins, you can see IO26 directly in that group.
Espressif also says GPIO33-37 are used for the higher 4-bit data lines plus DQS in 8-line SPI mode, so they should be used with caution if that memory mode is relevant.
The module pin table specifically notes IO26 is used by embedded PSRAM on ESP32-S2-MINI-2-N4R2 / 2U-N4R2 variants.

USB pins

Yes, USB pins are present:

Table

Pin name	Pin no.	USB function
GPIO19 / IO19	23	USB_D-
GPIO20 / IO20	24	USB_D+

Short summary

Bootstrap pins: IO0, IO45, IO46
Input-only GPIO: IO46
Internal-memory-related pins: IO26, IO33, IO34, IO35, IO36, IO37, IO38
USB pins: IO19 = USB_D-, IO20 = USB_D+

If you want, I can turn this into a pin-property checklist for the part project next.

Use the attached datasheet

Add pin descriptions

Flag unavailable groups

a day

IO10

IO21

IO19

IO18

IO41

IO37

IO34

IO7

IO11

RXD0

IO8

IO17

IO5

IO42

IO6

IO26

IO15

IO12

IO35

IO46

IO2

IO9

IO39

IO45

IO1

IO20

IO36

IO40

IO13

IO33

IO4

3V3

IO0

IO38

IO14

IO16

TXD0

IO3

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