Component Pin Overview

flux

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 namePin no.PurposeDefault strap
GPIO0 / IO04Boot mode selectWeak pull-up = 1
GPIO45 / IO4541VDD_SPI voltage selectWeak pull-down = 0
GPIO46 / IO4644Boot mode / ROM message printingWeak 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 namePin no.Notes
GPIO46 / IO4644Input-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

Table

Pin namePin no.Memory-related function
GPIO26 / IO2626SPICS1; datasheet notes this pin is used by embedded PSRAM on N4R2 variants
GPIO33 / IO3328SPIIO4, FSPIHD
GPIO34 / IO3429SPIIO5, FSPICS0
GPIO35 / IO3531SPIIO6, FSPID
GPIO36 / IO3632SPIIO7, FSPICLK
GPIO37 / IO3733SPIDQS, FSPIQ
GPIO38 / IO3834FSPIWP
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 namePin no.USB function
GPIO19 / IO1923USB_D-
GPIO20 / IO2024USB_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
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GND
GND
IO10
IO21
GND
GND
IO19
GND
IO18
EN
GND
IO41
GND
IO37
GND
IO34
IO7
IO11
RXD0
IO8
GND
IO17
GND
GND
IO5
IO42
IO6
GND
IO26
IO15
IO12
GND
IO35
GND
GND
IO46
IO2
IO9
IO39
IO45
GND
IO1
GND
IO20
GND
IO36
GND
GND
GND
GND
IO40
IO13
GND
GND
NC
IO33
IO4
3V3
GND
GND
IO0
IO38
GND
GND
GND
GND
GND
IO14
IO16
TXD0
IO3
GND
GND

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    Assets

    ESP32-S2-MINI-1U.step

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    3D3D Model

    ESP32-S2-MINI-1

    ESP32-S2-MINI-1 Symbol.svgDefault

    XCVR_ESP32-S2-MINI-1U-FS.kicad_mod

    XCVR_ESP32-S2-MINI-1U-FS
    ESP32-S2-MINI-2U-removebg-preview.png

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    ESP32-S2-MINI-2U-removebg-previewThumbnail

    ESP32-S2-MINI-2U

    ESP32-S2-MINI-2U thumbnail
    WiFi 802.11b/g/n Transceiver Module 2.4GHz Antenna Not Included, U.FL Surface Mount #RF #wifi #ESP32S2 #CommonPartsLibrary #MCU #module

    Properties

    Integrated Circuit

    Espressif Systems

    ESP32-S2-MINI-2U

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

    ESP

    creativecommons.org/licenses/by/4.0/

    parametric-v1

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