ESP32-PICO datasheet(21/64 Pages) ESPRESSIF

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2 Pins

2.2.3 Pin Mapping Between ESP32-PICO-V3/ESP32-PICO-V3-02 and Flash/PSRAM

Table 5 lists ESP32 pins exposed on the package that are also used to connect the in-package flash/PSRAM.

It is not recommended to use the pins connected to flash/PSRAM for any other purposes.

Table 5: Pin Mapping Between ESP32-PICO-V3/ESP32-PICO-V3-02 and Flash/PSRAM

Pin No.

Pin Name

In-Package Flash

In-Package PSRAM

CLK/IO6

FLASH_CLK

—

CMD/IO11

FLASH_CS

—

SD2/IO9

—

PSRAM_CS

SD3/IO10

—

PSRAM_CLK

2.3 Pin Function Description

Table 6 provides description of pin functions.

Table 6: Pin Function Description

Function Name

Description

GPIOx

General-purpose input and output (x is GPIO number). GPIO pins can be

assigned various functions, including digital and analog functions. For more

information, please refer to ESP32 Series Datasheet > Appendix IO_MUX.

MTCK/MTDO/MTDI/MTMS

JTAG interface signals.

32K_XP/XN

32 KHz external clock input/output (connecting to ESP32-PICO’s oscillator). P/N

means differential clock positive/negative.

RTC_GPIOx

RTC domain GPIO function for low power management.

TOUCHx

Analog function for touch sensing.

ADCx_CHy

Analog to digital conversion channel. x is ADC number, y is channel number.

DAC_x

Digital to analog conversion module. x is DAC number.

CLK_OUTx

Clock output for debugging. x is clock number.

SPI*

Signals of SPI0/1 module. * is CLK, CS0, D (MOSI), Q (MISO), WP (write-protect),

HD (hold).

HSPI*

Signals of SPI2 module. * is CLK, CS0, D, Q, WP, HD.

VSPI*

Signals of SPI3 module. * is CLK, CS0, D, Q, WP, HD.

U0*

Signals of UART0 module. * is CTS, RTS, RXD, TXD.

U1*

Signals of UART1 module. * is CTS, RTS, RXD, TXD.

U2*

Signals of UART2 module. * is CTS, RTS, RXD, TXD.

SD_*

Signals of SDIO slave. * is CLK, CMD, DATA0 ~ DATA3.

HS1_*

Port 1 signals of the SDIO host, * is CLK, CMD, STROBE, DATA0 ~ DATA7.

HS2_*

Port 2 signals of the SDIO host, * is CLK, CMD, DATA0 ~ DATA3.

Not connected.

2.4

Pin Compatibility Between ESP32-PICO Variants

While the ESP32-PICO variants are very similar from a pin-out perspective, there are several changes to the

pins and their functions, as shown in Table 7. The differences in pins require attention when migrating from

Espressif Systems

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