Hardware waterproof capacitive touch key BUF circuit

A capacitive touch and hardware technology, applied in electrical components, electronic switches, pulse technology, etc., can solve problems such as false touch sensing, complex structure, and complex operational amplifier structure

Pending Publication Date: 2019-09-13
CHANGSHA JEMO IC DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Capacitive touch button is a common user interface device. The sensor judges whether there is a finger touch action by detecting the capacitance of the human body; compared with mechanical buttons, the capacitive sensor is beautiful in appearance, easy to use, and has a long life; Or water droplets will change the capacitance of the sensor, and false touch sensing may occur; the invention provides a hardware waterproof capacitive touch button BUF circuit, the BUF circuit has the characteristics of simple structure, low power consumption and fast speed
[0003] figure 1 It is the input signal of the hardware waterproof BUF. When the CHAR signal is high, VIN is charged to VDD. When the CHAR signal is low, the VIN signal is betw...

Method used

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  • Hardware waterproof capacitive touch key BUF circuit
  • Hardware waterproof capacitive touch key BUF circuit

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Embodiment Construction

[0010] The working process of a hardware waterproof capacitive touch key BUF disclosed by the invention will be described in detail below in conjunction with the accompanying drawings.

[0011] figure 2 It is a kind of circuit structure of the present invention and is used in the BUF circuit of the hardware waterproof capacitive touch button; the circuit includes: two parts of the op-amp circuit and the acceleration circuit; The sources of the PMOS differential pair tubes M1 and M2 are connected to the bias voltage VB; the source of the PMOS differential pair tube M1 is connected to the drain of the PMOS tail current tube M0 and the source of the PMOS differential pair tube M2, and the drain is connected to Node VGN2, the gate is connected to the output node OUT of BUF; the source of the PMOS differential pair tube M2 is connected to the drain of the PMOS tail current tube M0 and the source of the PMOS differential pair tube M1, the drain is connected to the node VGN1, and th...

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Abstract

A capacitive touch key is a common user interface device. A sensor judges whether a finger touch action exists or not by detecting the capacitance of a human body. Compared with a mechanical key, thecapacitive sensor is attractive in appearance, easy to use and long in service life. However, if a water film or water drops exist on the touch interface, the capacitance of the sensor is changed, andmistaken touch induction may occur. The invention provides a hardware waterproof capacitive touch key BUF circuit. The BUF circuit has the advantages of being simple in structure, low in power consumption and high in speed.

Description

technical field [0001] The invention belongs to the field of integrated circuit design and is used for the waterproof application of capacitive touch keys. Background technique [0002] Capacitive touch button is a common user interface device. The sensor judges whether there is a finger touch action by detecting the capacitance of the human body; compared with mechanical buttons, the capacitive sensor is beautiful in appearance, easy to use, and has a long life; Or water droplets will change the capacitance of the sensor, and false touch sensing may occur; the invention provides a hardware waterproof capacitive touch button BUF circuit, which has the characteristics of simple structure, low power consumption and fast speed. [0003] figure 1 It is the input signal of the hardware waterproof BUF. When the CHAR signal is high, VIN is charged to VDD. When the CHAR signal is low, the VIN signal is between 0 and VDD / 2; that is, the input and output voltage range of BUF is 0 ~V...

Claims

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Application Information

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IPC IPC(8): H03K17/96H03K17/687
CPCH03K17/962H03K17/687
Inventor 李亚
Owner CHANGSHA JEMO IC DESIGN CO LTD
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