Ultra-low-power touch key circuit and application method thereof
A technology of ultra-low power consumption and low power consumption, which is applied in the field of ultra-low power consumption touch button circuit, which can solve the problems of complex circuit implementation, high average power consumption, and low key sensitivity, and achieve low power consumption, stable frequency, The effect of reducing scan time
Active Publication Date: 2017-12-22
深圳市锦锐科技股份有限公司
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Problems solved by technology
[0006] In order to solve the above problems, the present invention provides an ultra-low power consumption touch button circuit and its use method to improve the problems of low sensitivity, complex circuit implementation and high average power consumption of existing capacitive touch buttons
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[0026] The present invention relates to an ultra-low power consumption touch button circuit, which includes a clock generation circuit, a charging and discharging circuit, a counting circuit, a button circuit, and a timing circuit, wherein the charging and discharging circuit includes an external capacitor for discharging and an external capacitor for charging Moved button capacitors, the clock generation circuit includes two low-power fast clock output modules with different oscillation frequencies and an ultra-low-power slow clock output module, the low-power fast clock output module, ultra-low power consumption The slow clock output module generates clock frequencies of 4MHZ and 8KHZ respectively;
[0027] The ultra-low power consumption slow clock is used to control the timing of the timing circuit and the discharge of the external capacitor. The timing circuit is used for cycle timing. If the timing of the timing circuit is full, the connection between the charging and dis...
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The invention relates to the field of touch key circuits, and particularly relates to an ultra-low-power touch key circuit and an application method thereof. Compared with the prior art, the ultra-low-power touch key circuit is provided with a clock generation circuit, wherein the clock generation circuit comprises a low-power fast clock output module and an ultra-low-power slow clock output module, the clock output by the ultra-low-power slow clock output module is used to control the discharge and charge switching of charge and discharge circuits and the periodic timing of timing circuits, the clock output by the low-power fast clock output module is used to control a key capacitor to move to an external capacitor, and the two clock modules have the characteristics of stable frequency and low power consumption. By adopting the fast clock to transfer charge, the scanning time of the key circuit can be effectively reduced, and thus the power consumption of the system can be reduced, and the anti-interference ability and sensitivity of the circuit also can be improved; and all circuits adopt low-power components, after a key scanning cycle, all module circuits are disconnected, and thus the power consumption of the circuits can be significantly reduced on the basis of guaranteeing the performance.
Description
technical field [0001] The invention relates to the field of touch key circuits, in particular to an ultra-low power consumption touch key circuit and a method for using the same. Background technique [0002] At present, the operation of various functions can be realized by using mechanical keys, but the structure of the mechanical keys is complicated, and the mechanical keys have defects such as easy damage, poor user experience, difficult processing, and high cost. [0003] Touch buttons have the advantages of aesthetics, durability, low cost, and long life, and are used in more and more devices. At present, the touch buttons widely used are capacitive touch buttons. [0004] A capacitive touch key system and its micro-control unit are currently disclosed. The circuit is based on the principle of charge transfer, and realizes touch key detection by transferring the key charge to an external large capacitor and counting the transfer times. This circuit has the advantages ...
Claims
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IPC IPC(8): H03K17/96
CPCH03K17/962
Inventor 熊辉涛
Owner 深圳市锦锐科技股份有限公司