Capacitive touch detection circuit and method, capacitive touch detection apparatus

By employing a multi-level reference voltage comparison and continuous cycle confirmation mechanism, the problems of insufficient sensitivity and poor anti-interference performance of capacitive touch detection circuits are solved, achieving higher touch detection accuracy and stability.

CN122431545APending Publication Date: 2026-07-21SHENZHEN SMART CORE SEMICON TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN SMART CORE SEMICON TECH CO LTD
Filing Date
2026-03-23
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing charge-transfer capacitive touch detection circuits suffer from insufficient touch sensitivity and poor anti-interference performance, especially when the influence of parasitic capacitance is large and the environment changes, leading to false triggering and inconsistent sensitivity.

Method used

By employing a multi-level reference voltage comparison and a continuous multi-cycle confirmation mechanism, and through the combination of charge transfer circuit, voltage detection circuit, and control circuit, quantitative detection of capacitance changes and interference filtering are achieved, and the influence of parasitic capacitance is dynamically calibrated.

Benefits of technology

It improves the sensitivity and anti-interference performance of touch detection, reduces the false trigger rate, and enhances the consistency and adaptability of mass production.

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Abstract

The application provides a capacitive touch detection circuit, method and device, wherein the capacitive touch detection circuit comprises a touch electrode, a charge transfer circuit, a voltage detection circuit and a control circuit, the voltage detection circuit is provided with multiple reference voltages, the control circuit controls the charge transfer switch to repeatedly perform charging, charge transfer and charge clearing within a preset number of clock cycles, and the state of a level signal output by the voltage detection circuit is acquired; when m first level signals are acquired within multiple continuous preset numbers of clock cycles, it is determined that a touch operation occurs; otherwise, it is determined that no touch operation occurs; through the mechanism of 'continuous multiple N period confirmation', false triggering caused by instantaneous interference pulses, power supply noise, ESD interference and the like can be effectively filtered out, and through flexible configuration of the value of m, the sensitivity and anti-interference performance can be adjusted.
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