ESP32-PICO datasheet(35/64 Pages) ESPRESSIF

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4 Peripherals

Table 13 describes the ADC characteristics.

Table 13: ADC Characteristics

Parameter

Description

Min

Max

Unit

DNL (Differential nonlinearity)

RTC controller; ADC connected to an

–7

LSB

external 100 nF capacitor; DC signal input;

INL (Integral nonlinearity)

ambient temperature at 25 °C;

–12

LSB

Wi-Fi&Bluetooth off

Sampling rate

RTC controller

—

200

ksps

DIG controller

—

Msps

Notes:

• When atten = 3 and the measurement result is above 3000 (voltage at approx. 2450 mV), the ADC

accuracy will be worse than described in the table above.

• To get better DNL results, users can take multiple sampling tests with a filter, or calculate the average

value.

• The input voltage range of GPIO pins within VDD3P3_RTC domain should strictly follow the DC

characteristics provided in Table 18. Otherwise, measurement errors may be introduced, and chip

performance may be affected.

By default, there are ±6% differences in measured results between chips. ESP-IDF provides couple of

calibration methods for ADC1. Results after calibration using eFuse Vref value are shown in Table 14. For higher

accuracy, users may apply other calibration methods provided in ESP-IDF, or implement their own.

Table 14: ADC Calibration Results

Parameter

Description

Min

Max

Unit

Total error

Atten = 0, effective measurement range of 100

∼ 950 mV

–23

Atten = 1, effective measurement range of 100

∼ 1250 mV

–30

Atten = 2, effective measurement range of 150

∼ 1750 mV

–40

Atten = 3, effective measurement range of 150

∼ 2450 mV –60

For details, see ESP32 Technical Reference Manual > Chapter On-Chip Sensors and Analog Signal

Processing.

Pin Assignment

With appropriate settings, the ADCs can be configured to measure voltage on 18 pins maximum. For detailed

information about the pin assignment, see ESP32 Series Datasheet > Section Peripheral Pin Configurations

and ESP32 Technical Reference Manual > Chapter IO_MUX and GPIO Matrix.

4.3.2 Digital-to-Analog Converter (DAC)

Two 8-bit DAC channels can be used to convert two digital signals into two analog voltage signal outputs. The

design structure is composed of integrated resistor strings and a buffer. This dual DAC supports power supply

as input voltage reference. The two DAC channels can also support independent conversions.

For details, see ESP32 Technical Reference Manual > Chapter On-Chip Sensors and Analog Signal

Processing.

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