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Integral mutual capacitance circuit applied to touch detection and data processing method thereof

A circuit and integration technology, applied in the field of robotics, can solve the problems of increasing system power consumption loss, achieve the effect of improving anti-noise ability, improving overall performance, and reducing overall power consumption

Active Publication Date: 2021-07-16
合肥松豪电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in order to improve the detection accuracy, when the change of CM capacitance caused by finger touch is small, especially under the application conditions of the rear cover, the traditional mutual capacitance detection method needs to increase the sampling times N of the VOUT voltage, so that Amplify the difference of N×(△CODE'-△CODE) to correctly judge whether there is a finger touch, which will undoubtedly increase the power loss of the system

Method used

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  • Integral mutual capacitance circuit applied to touch detection and data processing method thereof
  • Integral mutual capacitance circuit applied to touch detection and data processing method thereof
  • Integral mutual capacitance circuit applied to touch detection and data processing method thereof

Examples

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Embodiment Construction

[0024] Such as Figure 5 As shown, the integral interconacy circuit applied to the touch detection, including the CA front unit, CA unit, integrating unit, analog to digital conversion unit, which are sequentially set.

[0025] The CA front unit includes an inverter, an internal CMB capacitor, an external CM capacitor, a series of inverters and two ends of the capacitance CMB in parallel, in parallel input, input terminal Tx input square wave signal, output RX transmission signal of. The CA front unit is used to send the input square wave signal to the input of the CA to perform the next step detection.

[0026] The CA unit includes an operational amplifier OP1, and the negative input terminal of the operational amplifier OP1 is connected to the output terminal Rx, and there is a switch RST1 in parallel with the output terminal of the op amp OP1, feedback adjustable capacitor CF, positive input input Reference voltage VREF. The output voltage V1 of the operational amplifier OP1. Th...

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Abstract

The invention discloses an integral mutual capacitance circuit applied to touch detection and a data processing method thereof. The circuit comprises a CA preposed unit, a CA unit, an integral unit and an analog-to-digital conversion unit which are arranged in sequence. The system has the advantages that the working time of the analog-to-digital converter ADC can be greatly shortened on the premise that the detection precision is guaranteed, and therefore the overall power consumption of the system is reduced. In addition, the anti-noise capability of the system is also greatly improved by a data processing mode of subtracting positive and negative edge data after integration, and the overall performance of the system is improved.

Description

Technical field [0001] The present invention relates to the technical field of robots, and more particularly to integral interconvails applied to touch detection and its data processing methods. Background technique [0002] With the continuous advancement of the times, the mutual capacitive TP touch detection technology is increasingly widely used in various applications. Mutual capacitive TP touch detection is a set of TX signals for signal transmission, and another set of RX signals are used for signal reception. Since there is a parasitic capacitance Cm between Tx and RX, the Rx receiving end can determine if there is a finger touch based on the amount of signal transmitted by the TX side: When there is no finger touch, the amount of semapses received always remains one. Relatively stable value, while when there is a finger touch, since the capacitance of the CM capacitance between Tx and RX changes, the amount of signal received by the RX receiver can also change accordingly...

Claims

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Application Information

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IPC IPC(8): H03M1/12
CPCH03M1/124
Inventor 黄俊钦李瑞兴
Owner 合肥松豪电子科技有限公司
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