Capacitance detection circuit, touch chip and electronic equipment

A capacitance detection and capacitance detection technology, applied in electronic switches, electrical components, electrical digital data processing, etc., can solve the problems of low sensitivity, small capacitance change, and circuit noise flooding, etc. The effect of accuracy
CN112602046BActive Publication Date: 2022-06-07SHENZHEN GOODIX TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHENZHEN GOODIX TECH CO LTD
Publication Date
2022-06-07

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Abstract

A capacitance detection circuit, a touch chip and electronic equipment, the capacitance detection circuit, which includes: a control module, a drive module, an offset module and a charge transfer module, the drive module is used to pass the first The charging branch forwardly charges the detection capacitor, or reversely charges the detection capacitor through the second charging branch; the canceling module is used to charge the detecting capacitor through the first canceling branch under the control of the control module The detection capacitor performs the offset processing of the basic capacitance, or, under the control of the control module, performs the offset processing of the basic capacitance on the detection capacitor through the second offset branch; the charge transfer module is used for Transfer processing is performed on the charge of the detection capacitor to generate an output voltage. The capacitance detection circuit improves the sensitivity of self-capacitance detection, and finally improves the accuracy of self-capacitance detection.
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Description

technical field

[0001] The embodiments of the present application relate to the technical field of capacitance detection, and in particular, to a capacitance detection circuit, a touch control chip, and an electronic device. Background technique

[0002] For self-capacitance detection, the principle is that a capacitance is formed between the detection electrode and the system ground, which is called self-capacitance detection. The capacitance formed between the detection electrode and the system ground has a basic capacitance or an initial capacitance. When a finger approaches or touches the detection electrode, the capacitance between the detection electrode and the system ground will increase. By detecting the change in the capacitance, the user's related touch operation can be determined.

[0003] In the field of capacitive touch, flexible screen is an important development direction. When the above-mentioned self-capacitance principle is used to realize capacitive touc...

Claims

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