Pressure detection circuit and electronic device

Abstract

The embodiment of the invention relates to the technical field of electronics and discloses a pressure detection circuit and an electronic device. The pressure detection circuit is applied to the electronic device comprising a key. The pressure detection circuit comprises a first voltage division circuit, a voltage comparer and a processor. The first voltage division circuit comprises a varistor and a common resistor. The varistor and the common resistor are connected in series. A series connection intersection of the varistor and the common resistor is connected with a first input end of thevoltage comparer. The voltage comparer is connected with the processor and is used for comparing a voltage of the first input end with a preset voltage of the second input end of the voltage comparerand outputting a comparison result to the processor. The processor is used for judging whether the key is pressed or not according to the comparison result. An ADC processing chip with relatively highcost in the prior art is removed and the pressure detection is carried out through combination of the voltage comparer and the varistor with the relatively lost cost, so the detection cost is reduced.

Description

Technical field [0001] The embodiments of the present invention relate to the field of electronic technology, and in particular to a pressure detection circuit and electronic equipment. Background technique [0002] With the rapid development of technology, it is now widely used in electronic products to determine whether a button (including virtual buttons, physical buttons, etc.) is pressed by detecting the pressure in electronic devices such as mobile phones and tablet computers. In the prior art, the working principle of judging whether a button is pressed is: the value collected by the pressure sensor is amplified and converted into an analog-to-digital converter (Analog-to-Digital Converter, "ADC"). The digital signal is processed by the central processing unit. [0003] However, the inventor found that there are at least the following problems in the prior art: Since the ADC processing chip is required to determine whether a button is pressed in the prior art, the cost of t...

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Problems solved by technology

[0003] However, the inventors have found that there are at least the following problems in the prior art: because in the prior art, it is necessary to use an ADC processing chip to determine whether a button is pressed, and the cost of the ADC processing chip is relatively high, which is not conducive to reducing the detection cost

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