Data Sheet

$
2. Pin Definitions
4
VDD3P3
P
Amplifier Power 2.5 V ~ 3.6 V
5
VDD_RTC
P
NC (1.1 V)
6
TOUT
I
ADC pin. It can be used to test the power-supply voltage of
VDD3P3 (Pin3 and Pin4) and the input power voltage of TOUT
(Pin 6). However, these two functions cannot be used
simultaneously.
7
CHIP_EN
I
Chip Enable
High: On, chip works properly
Low: Off, small current consumed
8
XPD_DCDC
I/O
Deep-sleep wakeup (need to be connected to EXT_RSTB);
GPIO16
9
MTMS
I/O
GPIO 14; HSPI_CLK
10
MTDI
I/O
GPIO 12; HSPI_MISO
11
VDDPST
P
Digital/IO Power Supply (1.8 V ~ 3.6 V)
12
MTCK
I/O
GPIO 13; HSPI_MOSI; UART0_CTS
13
MTDO
I/O
GPIO 15; HSPI_CS; UART0_RTS
14
GPIO2
I/O
UART TX during flash programming; GPIO2
15
GPIO0
I/O
GPIO0; SPI_CS2
16
GPIO4
I/O
GPIO4
17
VDDPST
P
Digital/IO Power Supply (1.8 V ~ 3.6 V)
18
SDIO_DATA_2
I/O
Connect to SD_D2 (Series R: 20 Ω); SPIHD; HSPIHD; GPIO9
19
SDIO_DATA_3
I/O
Connect to SD_D3 (Series R: 200 Ω); SPIWP; HSPIWP;
GPIO10
20
SDIO_CMD
I/O
Connect to SD_CMD (Series R: 200 Ω); SPI_CS0; GPIO11
21
SDIO_CLK
I/O
Connect to SD_CLK (Series R: 200 Ω); SPI_CLK; GPIO6
22
SDIO_DATA_0
I/O
Connect to SD_D0 (Series R: 200 Ω); SPI_MISO; GPIO7
23
SDIO_DATA_1
I/O
Connect to SD_D1 (Series R: 200 Ω); SPI_MOSI; GPIO8
24
GPIO5
I/O
GPIO5
25
U0RXD
I/O
UART Rx during flash programming; GPIO3
26
U0TXD
I/O
UART TX during flash programming; GPIO1; SPI_CS1
27
XTAL_OUT
I/O
Connect to crystal oscillator output, can be used to provide BT
clock input
28
XTAL_IN
I/O
Connect to crystal oscillator input
29
VDDD
P
Analog Power 2.5 V ~ 3.6 V
30
VDDA
P
Analog Power 2.5 V ~ 3.6 V
Pin
Name
Type
Function
Espressif
$ /$ 5 26
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2020.10