Capacitance detection circuit, detection method, detection chip and detection device

• Main Authors: XU QINTAO, XIE WEIJUN, ZHANG YANGE, LIU TENGFEI, ZHANG ZHONG, FENG YANDONG
• Format: Patent
• Language: Chinese; English
• Published: 14.06.2024
• Subjects: BASIC ELECTRONIC CIRCUITRY; CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; PHYSICS; PULSE TECHNIQUE

The invention relates to the technical field of capacitance detection, in particular to a capacitance detection circuit, a detection method, a detection chip and a detection device. When a user performs touch operation, the size of the capacitor Cx to be detected at the capacitance detection end changes. In the capacitance detection circuit provided by the invention, based on a constant current source charging principle, voltages in charging and discharging processes of a capacitor Cx to be detected are compared with a high flip voltage and a low flip voltage of a first trigger respectively, a second driving signal is output, and XOR operation is carried out on the first driving signal and the second driving signal, so that the capacitance Cx is detected. The first charging driving signal is obtained, the first charging driving signal is used for charging the integrating capacitor Cs, and the capacitance value of the capacitor Cx to be measured is converted into the time for charging the integrating capacitor