Wireless-Tag Technology Co., Ltd.
V1.0.0
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http://www.wireless-tag.com
5
Pin
Name
Description
19
IO0
RTC_GPIO0, GPIO0
20
IO01
RTC_GPIO1, GPIO1, TOUCH1, ADC1_CH0
21
IO02
RTC_GPIO2, GPIO2, TOUCH2, ADC1_CH1
22
IO05
RTC_GPIO5, GPIO5, TOUCH5, ADC1_CH4
23
IO03
RTC_GPIO3, GPIO3, TOUCH3, ADC1_CH2
24
IO04
RTC_GPIO4, GPIO4, TOUCH4, ADC1_CH3
25
IO06
RTC_GPIO6, GPIO6, TOUCH6, ADC1_CH5
26
IO21
RTC_GPIO21, GPIO21
27
IO20
RTC_GPIO20, GPIO20, U1CTS, ADC2_CH9, CLK_OUT1, USB_D+
28
IO19
RTC_GPIO19, GPIO19, U1RTS, ADC2_CH8, CLK_OUT2, USB_D-
29
IO18
RTC_GPIO18, GPIO18, U1RXD, ADC2_CH7, DAC_2, CLK_OUT3
30
IO17
RTC_GPIO17, GPIO17, U1TXD, ADC2_CH6, DAC_1
31
IO16
RTC_GPIO16, GPIO16, U0CTS, ADC2_CH5, XTAL_32K_N
32
IO15
RTC_GPIO15, GPIO15, U0RTS, ADC2_CH4, XTAL_32K_P
33
IO14
RTC_GPIO14, GPIO14, TOUCH14, ADC2_CH3, FSPIWP, FSPIDQS
34
IO13
RTC_GPIO13, GPIO13, TOUCH13, ADC2_CH2, FSPIQ, FSPIIO7
35
IO12
RTC_GPIO12, GPIO12, TOUCH12, ADC2_CH1, FSPICLK, FSPIIO6
36
EN
Chip Enable pin:
High level: on, enables the chip.
Low level: off, the chip powers off, low current.
Note: Do not leave the EN pin floating.
37
IO11
RTC_GPIO11, GPIO11, TOUCH11, ADC2_CH0, FSPID, FSPIIO5
38
IO10
RTC_GPIO10, GPIO10, TOUCH10, ADC1_CH9, FSPICS0, FSPIIO4
39
IO09
RTC_GPIO9, GPIO9, TOUCH9, ADC1_CH8, FSPIHD
40
IO08
RTC_GPIO8, GPIO8, TOUCH8, ADC1_CH7
41
GND
Ground
3.3 Strapping Pins
ESP32-S2 series has three strapping pins.
GPIO0 = IO0
GPIO45 = IO45
GPIO46 = IO46
Software can read the strapping values of these pins in “GPIO_STRAPPING” register.
During the chip’s system reset(power-on-reset, RTC watchdog reset, brownout reset, analog super
watchdog reset, crystal clock glitch detection reset), the latches of the strapping pins sample the
voltage level as strapping bits of “0” or “1”, and hold these bits until the chip is powered down or
shut down.
