电子元件与材料2025，Vol.44Issue(3)：285-291,7.DOI:10.14106/j.cnki.1001-2028.2025.1470
可自动调节基准值的电容式触摸检测电路
A capacitive touch detection circuit with auto-adjustable reference value
刘勇 1倪屹 1赵海 2戚祎2
作者信息
- 1. 江南大学集成电路学院,江苏江阴 214401
- 2. 江苏珞珈聚芯集成电路设计有限公司,江苏无锡 214122
- 折叠
摘要
Abstract
Currently,capacitive touch detection circuits largely rely on the collaboration between hardware and software.Their anti-interference performance is highly dependent on algorithms.This could lead to issues such as high-power consumption and limited applicability.These challenges can be addressed by assigning the tasks of comparison and anti-interference of capacitors to the hardware circuit.In the hardware implementation,an adder was employed to perform real-time comparison between the detected capacitance value and the reference value,which was dynamically refreshed according to changes in the external environment.The circuit can normally operate when the software is in sleep mode.Moreover,the overall circuit area can be further optimized.Simulation and chip test results demonstrate that the designed circuit can effectively resolve the problems of"false triggering"and"difficult triggering".The circuit can detect a minimum capacitance variation of 0.78125％,which is equivalent to the precision of a 7-bit ADC.The static current was 26 μA,and it can operate normally between-40 ℃ and 120℃.It can automatically calibrate the reference value according to the external environment.关键词
电容式触摸检测电路/可自动调节基准值/数字电路/抗干扰Key words
capacitive touch detection circuit/automatically adjustable benchmark value/digital circuits/anti-interference分类
电子信息工程引用本文复制引用
刘勇,倪屹,赵海,戚祎..可自动调节基准值的电容式触摸检测电路[J].电子元件与材料,2025,44(3):285-291,7.
