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Capacitive button detection method and apparatus

A detection method and capacitive technology, applied in the electronic field, can solve the problems of Cp increase, false detection, and no anti-shake measures, and achieve the effect of preventing noise and preventing false detection.

Active Publication Date: 2015-12-02
FORYOU GENERAL ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the finger touches the key, the Cp will increase, and the detection method of traditional technology may cause false detection
In addition, some traditional detection technologies do not contain anti-shake measures, which will also cause false detection

Method used

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  • Capacitive button detection method and apparatus
  • Capacitive button detection method and apparatus
  • Capacitive button detection method and apparatus

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] see figure 2 A capacitive key detection device includes a processing module, a raw counting module, a difference value reading module, a baseline updating module, and a debounce module. The raw counting module obtains in real time the raw count Rawcount calculated by the touch IC corresponding to the equivalent capacitance Cs of the capacitive key to ground. The difference reading module acquires the baseline Baseline and difference data in the OFF state in real time. The average value of touch IC counts when Baseline is OFF. The difference data is the difference between the raw count Ra...

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Abstract

The invention discloses a capacitive button detection method and apparatus. The method includes the steps: obtaining in real time a raw count and difference data, acquired through touch IC calculation, corresponding to the equivalent capacitance of a capacitive button relative to the ground; detecting a finger remove movement according to a fact whether the reduced value of the difference data exceeds a finger threshold value; determining whether a base line needs to be dynamically adjusted, and updating the base line if the base line needs to be dynamically adjusted so that an increased value of the difference data of finger touch and the reduced value of the difference data of finger removal are within an error range; and detecting whether the button is touched again according to a fact whether the increased value of the difference data exceeds the finger threshold value, and carrying out jitter elimination. According to the technical scheme, detection by mistake can be avoided.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a capacitive key detection method and device. Background technique [0002] With the advancement of electronic technology, capacitive touch screens have been widely used in various electronic devices such as mobile terminals and vehicle display terminals due to their advantages of convenience, ease of use, fashion and appearance, and low cost. [0003] The capacitive touch screen usually includes at least one capacitive button on the interface for the user to operate. like figure 1 As shown in FIG. 2 , it is a schematic diagram of the touch detection principle of the capacitive key in the traditional technology. The detection principle mainly includes detecting the equivalent capacitance Cs of the capacitive key relative to the ground. The equivalent capacitance Cs corresponds to the unique corresponding digital value Rawcount calculated by the touch IC. For example, in a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/96
Inventor 周全
Owner FORYOU GENERAL ELECTRONICS