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ESP32-S2-Saola-1.rst

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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