Touch detection circuit and earphone
A detection circuit and touch technology, applied in earphone/headphone accessories, headphone mechanical/electronic switches, electrical components, etc., can solve the problems of short service life and unstable detection of sensors, and achieve the effect of improving service life
Pending Publication Date: 2021-05-14
REALMAGIC SEMICON (SHENZHEN) CO LTD
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Problems solved by technology
[0003] The purpose of this application is to provide a touch detection circuit, aiming to solve the problem of unstable detection and short service life of the sensor in the traditional touch detection circuit
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[0037]In order to make the technical problems, technical solutions and beneficial effects to be solved in this application, the present application will be described in detail below with reference to the accompanying drawings and examples. It will be appreciated that the specific embodiments described herein are intended to explain the present application and is not intended to limit the present application.
[0038]figure 1 A first example principle block diagram of the touch detection circuit 110 provided by the present application embodiment is shown. For convenience of explanation, only the part related to the present embodiment is shown, as detailed below:
[0039]The touch detection circuit 110 for the capacitive sensor 200 includes a detection circuit 110, an integral circuit 120, a discharging circuit 140, a compensation circuit 150, and a control circuit 130.
[0040]The detection circuit 110 is connected to the N capacitive sensor 200, configured to receive the first pulse signal P...
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The invention discloses a touch detection circuit and an earphone. The detection circuit outputs a first voltage to a capacitance sensor according to a first pulse signal, and a charging voltage output by the capacitance sensor is switched according to a second pulse signal; an integrating circuit integrates the charging voltage, the charging voltage and / or a compensation voltage and outputs a first voltage analog quantity; the discharging circuit outputs discharging voltage according to the fourth pulse signal, the compensation circuit performs charging according to the first pulse signal when the compensation signal is input and outputs compensation voltage according to the second pulse signal, and the control circuit outputs the first pulse signal and the second pulse signal; and the third pulse signal, the fourth pulse signal and the compensation signal are output according to the first voltage analog quantity, so that compatibility with different capacitive sensors is realized, and when the relative capacitance value of the capacitive sensor changes in the use process, the touch state of the capacitive sensor can be continuously identified through compensation, and then the service life of the capacitive sensor is prolonged.
Description
Technical field[0001]This application belongs to the field of capacitor touch technology, and more particularly to a touch detection circuit and a headset.Background technique[0002]The conventional capacitive touch detection circuit is calibrated to the equivalent capacitance of the capacitive sensor relative to the control device in advance, so that the equivalent capacitance of the constant state and the touch state of the capacitive sensor can be identified by the control device, in this way, to achieve the identification touch, However, when the equivalent capacitance of the sensor changes, it may cause the control device to distinguish the normal and touch states of the sensor, resulting in unstable and life of the sensor.Inventive content[0003]The purpose of this application is to provide a touch detection circuit to solve the problem of detecting unstable and causing the sensor's service life in the conventional touch detection circuit.[0004]The first aspect of the present ap...
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IPC IPC(8): H03K17/96H04R1/10
CPCH03K17/962H04R1/1041H04R2201/10
Inventor 韩静陈勇刘通万上宏张刚峰
Owner REALMAGIC SEMICON (SHENZHEN) CO LTD