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A capacitive touch circuit

A capacitive touch and circuit technology, applied in the direction of electrical digital data processing, instruments, data processing input/output process, etc., can solve the problems of high cost and large product design limitations, and achieve low cost, small limitations, and solution Effects of prior art problems

Active Publication Date: 2016-12-28
KOSTAL SHANGHAI MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of this application is to provide a capacitive touch circuit to solve the problems of high cost and large limitations on product design in the existing method of realizing capacitive touch control through a dedicated chip

Method used

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0030] The embodiment of the present application discloses a capacitive touch circuit to solve the problems of high cost and great limitation on product design in the existing method of implementing capacitive touch control through a dedicated chip.

[0031] refer to figure 1 The capacitive touch circuit provided in Embodiment 1 of the present application includes a microprocessor 110 and a peripheral circuit 120; the peripheral circuit 120 includes a comparator A, a sensing capacitor Cx fo...

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PUM

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Abstract

The invention discloses a capacitive touch circuit which comprises a microprocessor and a peripheral circuit. The peripheral circuit comprises a comparator, an induction capacitor for sensing touch movements, a reference capacitor and a pull-up resistor. The reference capacitor is connected between the first output end and the second output end of the microprocessor, the first output end is connected with the forward input end of the comparator, and the second output end is grounded through the induction capacitor. The input end of the microprocessor is connected with the output end of the comparator. The output end of the comparator is connected with a power supply through the pull-up resistor. The reverser end of the comparator is accessed to preset reference voltage. By the capacitive touch circuit composed of the microprocessor and the peripheral circuit formed by common elements, whether touch movements occur or not is judged, actual positions of the elements can be adjusted optionally according to needs. Compared with special chips, the capacitive touch circuit is simple in structure and low in cost and application product limitation, and technical problems in the prior art are solved.

Description

technical field [0001] The present application relates to the field of application technology of electronic products, in particular to a capacitive touch circuit. Background technique [0002] In recent years, touch screens based on capacitive touch technology have gradually been widely used in electronic and electrical products. Compared with the traditional mechanical buttons, the touch screen has many advantages such as making the control interface of the product simple and beautiful, without wear and tear. The principle is to collect the capacitance value of the touch area to judge whether there are recognizable objects such as human hands approaching, and then decide whether to perform related operations. [0003] At present, the capacitive touch control technology applied to electronic and electrical products is realized through dedicated chips with built-in capacitive touch functions provided by chip factories such as cypress, Atmel, microchip, and Analog Devices. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044
Inventor 张毅君史明
Owner KOSTAL SHANGHAI MANAGEMENT