ESP32-P4 datasheet(79/93 Pages) ESPRESSIF

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4 Functional Description

4.2.3 Analog Signal Processing

This subsection describes components on the chip that sense and process real-world data.

4.2.3.1 Touch Sensor

ESP32-P4 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,

detection of frequency hopping, and digital filtering feature.

Feature List

• Detection of 14 capacitive touch pins

• Sampling triggered by software or dedicated hardware timer

• Two sampling methods:

– Pulses from the touch pins used as clock signals to count the sampling period

– Pulses from the touch pins used as digital signals; sample the rising edge of the digital signal with

the system clock to count the sampling period

• Scan mode, supporting sequential sampling of multiple touch pins by configuring the Touch FSM.

• Timeout mechanism to monitor channel abnormality

• Frequency hopping to increase the anti-interference of detection

• Proximity sensing mode with up to three configurable channels

• Configuration of individual touch sensors to operate normally in sleep mode

• Wake-up by touch sensor

• Moisture resistance

• Waterproof design

Pin Assignment

The pins of the touch sensor are multiplexed with GPIO2–GPIO15, LP_GPIO2–LP_GPIO15, LP_UART interface,

and one four-line interface of SPI2. When the pins are configured for the analog function, the multiplexed

digital functions are disabled.

4.2.3.2

Temperature Sensor (TSENS)

ESP32-P4 provides a temperature sensor for real-time monitoring of temperature changes within the chip. The

sensor converts analog voltage to digital values and provides compensation for temperature offsets.

Feature List

• Software-triggered temperature measurement, which once triggered, the sensor continuously measures

temperature. Software can read the data at any time.

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ESP32-P4 Series Datasheet v0.5

ESP32-P4 bảng dữ liệu(PDF) 79 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.