Pressure detection circuit and device and pressure input device
A technology for detecting circuit and pressure, applied in the field of pressure detection circuit and pressure detection device, can solve the problems of high cost, poor applicability and low resolution of ADC circuit, and achieve the effect of simple structure, strong practicability and high resolution
Active Publication Date: 2021-03-16
SHENZHEN HUION ANIMATION TECH
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Problems solved by technology
[0003] Based on the above technical problems, the present invention discloses a pressure detection circuit, thereby solving the technical problems of the existing ADC circuit such as high cost, susceptibility to interference, low resolution and poor applicability
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[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.
[0043]In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "one end", "the other end", "both ends", "between" and the like are based on the orientation or positional relationship shown in the drawings, It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention. Meanwhile, in the present invention "First", "Second"...
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The invention discloses a pressure detection circuit, and the circuit comprises an oscillation unit which is used for outputting an oscillation signal; a counter unit which is connected with the oscillation unit and is used for acquiring oscillation signal frequency and counting; a comparator unit which is connected with the counter unit and is used for sending a signal to control the counter unitto count or stop; a voltage conversion unit which is connected with the comparator unit and used for providing comparable voltage for the comparator unit; a constant current source charging unit which is connected with the comparator unit and used for providing comparison voltage for the comparator unit; a charging and discharging control unit which is connected with the constant current source charging unit and is used for carrying out charging and discharging control on the constant current source charging unit; and a pressure acquisition unit which serves as a component of the voltage conversion unit or the oscillation unit and converts the pressure into comparable voltage or oscillation signal frequency change. The invention further discloses a pressure detection device and a pressureinput device. The device has the technical effects of high resolution, power saving and high applicability.
Description
【Technical field】 [0001] The invention relates to a pressure detection circuit, which belongs to the technical field of pressure detection and control. Specifically, the present invention discloses a pressure detection circuit, and also discloses a pressure detection device based on the pressure detection circuit, and a pressure input device composed of the pressure detection circuit or the pressure detection device. 【Background technique】 [0002] Common input devices with pressure, such as joysticks and stylus, have been widely used in daily life, such as playing games, drawing, signing, etc. Generally, ADC circuits are used to obtain the change in pressure. ADC is usually 8 to 12 If you want to achieve higher resolution, you need a higher number of bits (such as 16 bits). In view of the low voltage of the signal source of the high-digit ADC, the resolution is difficult to be fully utilized due to noise interference, for example Under the condition of 2V / 16 bits, one LSB=...
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IPC IPC(8): G01L1/14G01L1/22
CPCG01L1/144G01L1/2262G01L1/2256G01L1/14G01L1/10G01L1/142G06F3/0202H03K5/24H03K21/02
Inventor 不公告发明人
Owner SHENZHEN HUION ANIMATION TECH