ESP32-S2 datasheet(22/51 Pages) ESPRESSIF

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Functional Description

3.3.2 DigitaltoAnalog Converter (DAC)

ESP32-S2 has two 8-bit DAC channels that convert two digital signals into two analog voltage signal outputs.

The two DAC channels support independent conversions. The design structure is composed of integrated

resistor strings and a buffer. This dual DAC supports VDD3P3_RTC_IO power supply as input voltage

reference.

3.3.3 Temperature Sensor

The temperature sensor generates a voltage that varies with temperature. The voltage is internally converted via

an ADC into a digital value.

The temperature sensor has a range of –20 °C to 110 °C. It is designed primarily to sense the temperature

changes inside the chip. The temperature value depends on factors like microcontroller clock frequency or I/O

load. Generally, the chip’s internal temperature is higher than the ambient operating temperature.

3.3.4 Touch Sensor

ESP32-S2 has 14 capacitive-sensing GPIOs, which detect variations induced by touching or approaching the

GPIOs with a finger or other objects. The low-noise nature of the design and the high sensitivity of the circuit

allow relatively small pads to be used. Arrays of pads can also be used, so that a larger area or more points can

be detected. The touch sensing performance can be further enhanced by the waterproof design and digital

filtering feature. The 14 capacitive-sensing GPIOs are listed in Table 5.

Table 5: CapacitiveSensing GPIOs Available on ESP32S2

Capacitivesensing signal name

Pin name

TOUCH1

GPIO1

TOUCH2

GPIO2

TOUCH3

GPIO3

TOUCH4

GPIO4

TOUCH5

GPIO5

TOUCH6

GPIO6

TOUCH7

GPIO7

TOUCH8

GPIO8

TOUCH9

GPIO9

TOUCH10

GPIO10

TOUCH11

GPIO11

TOUCH12

GPIO12

TOUCH13

GPIO13

TOUCH14

GPIO14

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ESP32-S2 Series Datasheet v1.4

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