Capacitance detection circuit, integrated circuit, electronic equipment and capacitance detection method

Abstract

Embodiments of the present application provide a capacitance detection circuit, an integrated circuit, electronic equipment, and a capacitance detection method. The capacitance detection circuit includes an integration circuit, a voltage detection circuit, and a capacitance adjustment circuit. The integration circuit includes a comparator and an integration capacitor; the integration capacitor is connected to Between the input terminal and the output terminal of the comparator; the voltage detection circuit is connected to the integration circuit to detect the accumulated voltage of the single integration of the integration capacitor, and output the adjusted voltage according to the accumulated voltage; the capacitor adjustment voltage is connected to the voltage detection circuit and the integration circuit, It is used to adjust the equivalent capacitance of the integral capacitor according to the adjustment signal, so as to adjust the accumulated voltage of the next integration of the integral capacitor. The capacitance detection circuit provided in the embodiment of the present application can realize accurate detection of large capacitance and fast detection of small capacitance.

Description

technical field [0001] The present application relates to the technical field of capacitance detection, in particular to a capacitance detection circuit, an integrated circuit, electronic equipment and a capacitance detection method. Background technique [0002] After years of technological evolution and mass production testing, touch button technology is now becoming more mature. Due to the advantages of convenience, fashion and low cost, more and more electronic products have begun to shift from traditional mechanical keys to touch keys. The touch button judges the occurrence of a touch event by detecting the capacitance change on the button through the capacitance detection integrated circuit. The change in the capacitance of the button will cause the capacitance change on the detection pin of the capacitance detection integrated circuit, and then detect the touch event. [0003] However, the capacitance changes on the detection pins are different under different workin...

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Problems solved by technology

[0003] However, the capacitance change on the detection pin is different under different working conditions, and the traditional capacitance detection integrated circuit is often difficult to cope with the capacitance change under different working conditions

For example, when the capacitance change on the detection pin is small, multiple integrations are required to reach the touch activation threshold, resulting in slow detection speed; when the capacitance change on the detection pin is large, it will cause integration overflow

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