ESP32-S2-Saola-1

The ESP32-S2-Saola-1 development board is one of Espressif’s official boards. This board is based on the ESP32-S2-WROVER module, with the ESP32-S2 as the core.

Specifications

  • Wi-Fi 802.11 b/g/n (802.11n up to 150 Mbps)

  • Built around ESP32-S2 series of SoCs Xtensa® single-core

  • Integrated 4 MB SPI flash

  • Integrated 2 MB PSRAM

  • Peripherals

    • 43 × programmable GPIOs

    • 2 × 13-bit SAR ADCs, up to 20 channels

    • 2 × 8-bit DAC

    • 14 × touch sensing IOs

    • 4 × SPI

    • 1 × I2S

    • 2 × I2C

    • 2 × UART

    • RMT (TX/RX)

    • LED PWM controller, up to 8 channels

    • 1 × full-speed USB OTG

    • 1 × temperature sensor

    • 1 × DVP 8/16 camera interface, implemented using the hardware resources of I2S

    • 1 × LCD interface (8-bit serial RGB/8080/6800), implemented using the hardware resources of SPI2

    • 1 × LCD interface (8/16/24-bit parallel), implemented using the hardware resources of I2S

    • 1 × TWAI® controller (compatible with ISO 11898-1)

  • On­board PCB antenna or external antenna connector

Header Block

Note

Not all of the chip pins are exposed to the pin headers.

J2

No.

Name

Type

Function

1

3V3

P

3.3 V power supply

2

IO0

I/O

GPIO0, Boot

3

IO1

I/O

GPIO1, ADC1_CH0, TOUCH_CH1

4

IO2

I/O

GPIO2, ADC1_CH1, TOUCH_CH2

5

IO3

I/O

GPIO3, ADC1_CH2, TOUCH_CH3

6

IO4

I/O

GPIO4, ADC1_CH3, TOUCH_CH4

7

IO5

I/O

GPIO5, ADC1_CH4, TOUCH_CH5

8

IO6

I/O

GPIO6, ADC1_CH5, TOUCH_CH6

9

IO7

I/O

GPIO7, ADC1_CH6, TOUCH_CH7

10

IO8

I/O

GPIO8, ADC1_CH7, TOUCH_CH8

11

IO9

I/O

GPIO9, ADC1_CH8, TOUCH_CH9

12

IO10

I/O

GPIO10, ADC1_CH9, TOUCH_CH10

13

IO11

I/O

GPIO11, ADC2_CH0, TOUCH_CH11

14

IO12

I/O

GPIO12, ADC2_CH1, TOUCH_CH12

15

IO13

I/O

GPIO13, ADC2_CH2, TOUCH_CH13

16

IO14

I/O

GPIO14, ADC2_CH3, TOUCH_CH14

17

IO15

I/O

GPIO15, ADC2_CH4, XTAL_32K_P

18

IO16

I/O

GPIO16, ADC2_CH5, XTAL_32K_N

19

IO17

I/O

GPIO17, ADC2_CH6, DAC_1

20

5V0

P

5 V power supply

21

GND

G

Ground

J3

No.

Name

Type

Function

1

GND

G

Ground

2

RST

I

CHIP_PU, Reset

3

IO46

I

GPIO46

4

IO45

I/O

GPIO45

5

IO44

I/O

GPIO44, U0RXD

6

IO43

I/O

GPIO43, U0TXD

7

IO42

I/O

GPIO42, MTMS

8

IO41

I/O

GPIO41, MTDI

9

IO40

I/O

GPIO40, MTDO

10

IO39

I/O

GPIO39, MTCK

11

IO38

I/O

GPIO38

12

IO37

I/O

GPIO37

13

IO36

I/O

GPIO36

14

IO35

I/O

GPIO35

16

IO34

I/O

GPIO34

17

IO33

I/O

GPIO33

17

IO26

I/O

GPIO26

18

IO21

I/O

GPIO21

19

IO20

I/O

GPIO20, ADC2_CH3, USB_D+

20

IO19

I/O

GPIO19, ADC2_CH3, USB_D-

21

IO18

I/O

GPIO18, ADC2_CH3, DAC_2

P: Power supply; I: Input; O: Output; T: High impedance.

Pin Layout

ESP32-S2-Saola-1 (click to enlarge)

Strapping Pins

Some of the GPIO’s have important features during the booting process. Here is the list of the strapping pins on the ESP32-S2.

GPIO

Default

Function

Pull-up

Pull-down

IO45

Pull-down

Voltage of Internal LDO (VDD_SDIO)

1V8

3V3

IO0

Pull-up

Booting Mode

SPI Boot

Download Boot

IO46

Pull-down

Booting Mode

Don’t Care

Download Boot

IO46

Pull-up

Enabling/Disabling Log Print During Booting and Timing of SDIO Slave

U0TXD Active

U0TXD Silent

For more detailed information, see the ESP32-S2 datasheet.

Restricted Usage GPIOS

Some of the GPIO’s are used for the external flash and PSRAM. These GPIO’s cannot be used:

GPIO

Shared Function

IO26

Connected to PSRAM

Other GPIO’s are INPUT ONLY and cannot be used as output pin:

GPIO

Function

IO46

GPIO46

Resources