Detailed Explanation of MCU Capacitive Touch Sensing Technology Principles 1

MCU capacitive touch sensing technology is a common PCM1802DBR touchscreen technology widely used in electronic products such as smartphones, tablets, and gaming devices. It detects and locates touch operations by sensing changes in the charge on the touched object. The following will provide a detailed explanation of the principles of MCU capacitive touch sensing technology.

The capacitive touch sensing technology of MCU mainly consists of two parts: the sensing circuit and the control circuit. The sensing circuit is responsible for detecting the charge changes on the touched object, while the control circuit converts these detected charge changes into specific touch operations.  diode

The sensing circuit typically consists of a group of capacitive sensors, which are usually arranged along the edges of the touch screen. Each capacitive sensor comprises a capacitive electrode and a reference electrode, separated by an insulating layer. When the touch screen is touched, the human body or other conductive objects introduce a certain amount of charge, causing a change in the capacitance between the capacitive electrode and the reference electrode. This capacitance change can be detected by measuring the voltage between the capacitive electrode and the reference electrode.

The control circuit is responsible for converting the detected capacitance changes into digital signals and processing them to achieve touch detection and positioning. It typically consists of a microcontroller unit (MCU) and some peripheral circuits. The MCU serves as the core component of the entire touch screen, capable of reading the voltage values from capacitive sensors and determining whether a touch operation has occurred, as well as its location, through a series of algorithms and processing.  diode