Component Pin Analysis

Worked for 57 sec

I checked it. The datasheet lookup by part name didn’t resolve in the tool, so I fell back to the project’s official datasheet URL and extracted the pin groups directly.

Bootstrap pins

Table

Pin	Pin number	Notes
GPIO0 / IO0	4	Boot mode strapping pin
GPIO45 / IO45	41	`VDD_SPI` voltage strapping pin
GPIO46 / IO46	44	Boot mode and ROM message print control strapping pin

Default strap states

Table

Pin	Default
GPIO0	Pull-up, bit 1
GPIO45	Pull-down, bit 0
GPIO46	Pull-down, bit 0

Boot combinations

Table

GPIO0	GPIO46	Mode
1	X	SPI boot default
0	0	Download boot
0	1	Invalid / avoid

Input-only pins

Table

Pin	Pin number	Type
IO46 / GPIO46	44	Input-only
EN	45	Input

Note: the datasheet explicitly says EN must not be left floating.

Pins connected to internal memory

Table

Pin	Pin number	Memory-related function
IO9	13	FSPIHD
IO10	14	FSPICS0 / FSPIIO4
IO11	15	FSPID / FSPIIO5
IO12	16	FSPICLK / FSPIIO6
IO13	17	FSPIQ / FSPIIO7
IO14	18	FSPIWP / FSPIDQS
IO26	26	SPICS1
IO33	28	SPIIO4 / FSPIHD
IO34	29	SPIIO5 / FSPICS0
IO35	31	SPIIO6 / FSPID
IO36	32	SPIIO7 / FSPICLK
IO37	33	SPIDQS / FSPIQ
IO38	34	FSPIWP

Special reservation note

Table

Pin	Pin number	Restriction
IO26	26	Used by embedded PSRAM on N4R2 variants, so it cannot be used for other purposes on those versions

If you want, I can next convert this into a Flux pin-property mapping for:

Pin Type
Section
Pin Group
Sub-symbol Designator Suffix

Create pin-property mapping

Add pin restrictions

Check all ESP32 pins

GND

IO10

GND

IO19

GND

IO18

GND

IO41

GND

IO37

GND

IO7

IO11

IO8

GND

IO17

GND

IO5

IO42

IO6

GND

IO15

IO12

GND

IO35

GND

IO39

GND

IO20

GND

IO36

GND

IO40

GND

IO38

GND

IO16

GND

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