Touch key value self-adaptive circuit and method

Abstract

The invention discloses a touch key value self-adaptive circuit. The circuit comprises a touch detection circuit used for acquiring a key value of a touch key, a key value comparison circuit which is used for comparing the key value with a preset upper limit value and a preset lower limit value and sending a comparison result signal to a result judgment circuit, the result judging circuit which is used for judging according to the comparison result signal, and sending a current adjusting signal to a current adjusting circuit if the comparison result signal shows that the key value is greater than the preset upper limit value or less than the preset lower limit value, and the current adjusting circuit which is used for adjusting the charging current value of an adjustable constant current source to enable the key value to be adjusted to a target range when receiving the current adjusting signal. The invention further discloses a touch key value self-adaptive method. According to the method, a hardware module is used for replacing software to carry out self-adaption on the touch value, consumed time is short, and occupied resources are few.

Description

technical field [0001] The invention belongs to the technical field of touch, and in particular relates to a key value adaptive circuit and method of a touch button. Background technique [0002] With the rapid development of the home appliance industry and the consumer electronics industry, the trend of touch buttons replacing traditional mechanical buttons is becoming more and more intense. Capacitive touch technology is a mainstream branch of touch technology, and it is also a relatively mature technology, so the improvement of this technology is also particularly important. Before most capacitive touch technologies enter the normal detection stage, the first step is to adapt the key value of the touch button to an appropriate range. This step is generally completed using software programs, and because this step needs to be executed in the prior There are many instructions and complex algorithms, so the whole process is time-consuming and will occupy more resources of th...

AI Technical Summary

Problems solved by technology

Before most capacitive touch technologies enter the normal detection stage, the first step is to adapt the key value of the touch button to an appropriate range. This step is generally completed using software programs, and because this step needs to be executed in the prior There are many instructions and the algorithm is more complicated, so the whole process is time-consuming and will take up more resources of the microcontroller itself.

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