Key detection circuit and key detection method of electronic equipment

Abstract

The invention discloses a key detection circuit of electronic equipment. The key detection circuit comprises a power input terminal, a key module and a main controller; the main controller detects the power supply voltage input by the power input terminal and the key voltage output by the key module, Obtain the actual power supply voltage and actual button voltage, convert the detected actual power supply voltage and actual button voltage into corresponding actual power supply ADC values ​​and actual button ADC values, according to the ratio of the actual power supply ADC value to the standard power supply ADC value, and the standard The minimum button ADC value and the standard maximum button ADC value dynamically adjust the voltage detection range corresponding to each button in the button module, and detect the pressed button according to the actual button ADC value and the voltage detection range. The invention also discloses a key detection method of the electronic equipment. The invention improves the accuracy of key detection, and can avoid misalignment of key functions caused by misjudgment and misresponse.

Description

technical field [0001] The invention relates to the technical field of key detection, in particular to a key detection circuit and a key detection method of electronic equipment. Background technique [0002] In general, for the power supply of the button module of electronic equipment, different power supplies are used in different usage occasions, which leads to the discreteness of the power supply voltage provided by the power supply to the button module, that is, the power supply voltage of the button module changes in different occasions , an offset occurs, which makes the voltage detected by the key detection circuit discrete, resulting in a key function error. [0003] In order to prevent misalignment of button functions, the method of reducing the number of buttons is generally adopted, so that each button is assigned a larger voltage range value, so as to accurately detect the button actually pressed and avoid misjudgment. For example, the power supply voltage prov...

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Problems solved by technology

[0004] It can be seen from the above that when the number of buttons increases, the voltage range value assigned to each button becomes smaller, and the voltage detection range corresponding to each button becomes smaller, and because the power supply voltage is discrete (the power supply range of a general power supply is ±10 %, the power supply voltage offset range is -0.33~0.33V), and due to the processing of the key detection circuit, the performance of the internal components of the IC changes with temperature changes, aging and other factors, causing the key detection circuit to detect the actual value of a certain key. The voltage of a button may fall within the voltage detection range of another button, which may easily cause misjudgment and wrong response, resulting in misalignment of button functions. Therefore, in order to ensure accurate button functions, the number of buttons should not be increased too much

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