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Capacitive sensing key and key detection method

A capacitive, button technology, applied in electrical components, electronic switches, pulse technology, etc., can solve the problems of complex circuit structure, low product reliability, and high cost, achieve high button sensitivity, increase product reliability, and reduce product costs. Effect

Active Publication Date: 2015-04-15
SUZHOU LUZHIYAO TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the existing capacitive sensing buttons is that the circuit structure is complex, and a special chip needs to be used to detect the sensing signal formed between the human finger or the touch pen and the sensing electrode. The product reliability is low and the cost is high.

Method used

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  • Capacitive sensing key and key detection method
  • Capacitive sensing key and key detection method
  • Capacitive sensing key and key detection method

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Embodiment Construction

[0042] In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.

[0043] figure 2 It is a structural schematic diagram of a capacitive sensing button according to an embodiment of the present invention. The capacitive sensing key of the present invention adopts the working mode of "capacitive charge transfer", and is directly connected to the sensing electrode 201 in the capacitive touch key 20 by a microprocessor 21 (CPU), and the microprocessor 21 has an analog-to-digital converter 212 (A / D) function input / output (I / O) port. The microprocessor CPU detects the touch sensing capacitance Cf generated when the human finger or the touch pen touches the sensing electrode, thereby producing a key detection signal representing the key action. Since the capacitive touch key has an external distribution ...

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Abstract

The invention relates to a capacitive sensing key and a key detection method. The capacitive sensing key comprises a capacitive touch key (20) and a microprocessor (21), wherein the capacitive touch key (20) is provided with a sensing electrode (201), and the sensing electrode (201) is connected with the microprocessor (21); and the microprocessor (21) is connected with the capacitive touch key (20) through an input / output port (210) and is used for repetitively charging and discharging the capacitive touch key (20), detecting a touch sensing capacitor (Cf) of the sensing electrode (201) and generating key detection signals (AD0 and ADf). Since the capacitive sensing key and the key detection method adopt the working principle of capacitor charge transfer, the circuit structure is simplified, the product reliability is increased, the cost is low, the sensitivity is high, the interference resistance is high and the capacitive sensing key and the key detection method are suitable for all kinds of electronic and electric products.

Description

technical field [0001] The invention relates to a non-contact electronic key, and more specifically, to a capacitive sensing key and a key detection method thereof. Background technique [0002] Capacitive sensing key is a commonly used non-contact electronic key. Compared with traditional mechanical keys, it has the advantages of waterproof, long life, stable performance, and sensitive response. Therefore, it is widely used in the control panels of various electronic and electrical products. among. [0003] Capacitive sensing keys of the prior art such as figure 1 As shown, the working principle of the "chill oscillator" is used to realize the detection of the human finger or the touch pen touching the sensor key. like figure 1 As shown, the existing capacitive sensing keys include: a capacitive touch key 10, an N-way multiplexer 11 (N is generally 4, 6, 8, 16, etc.), a comparator 12 and a timer counter 13; wherein, the capacitive touch The key 10 has a sensing electrod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/96
Inventor 周荣吴金炳谌清平丁央舟惠滨华陆健
Owner SUZHOU LUZHIYAO TECH