Capacitance measuring circuit and comprehensive control circuit applying same
A measurement circuit and comprehensive control technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve problems such as structural damage
Inactive Publication Date: 2012-07-18
RAYDIUM SEMICON
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Problems solved by technology
Because the traditional mechanical switch needs to be in direct contact with the user to operate in response to the user's control command, the traditional mechanical device has the disadvantage of being prone to structural damage during the user's operation
Method used
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Embodiment Construction
[0022] The capacitance value measurement circuit of the embodiment of the present invention responds to the power signal provided by the multi-power supply circuit to perform a capacitance value measurement operation on the capacitance to be measured.
[0023] Please refer to figure 1 and figure 2 , figure 1 Shows a schematic diagram of a capacitance value measuring circuit according to an embodiment of the present invention, figure 2 show figure 1 The related signal timing diagram of the capacitance value measuring circuit 1. The capacitance value measuring circuit 1 is used to measure the capacitance value of the capacitance Cc to be measured. One end of the capacitor Cc under test receives the ground voltage, and the other end is coupled to the end point Ed. The end point Ed has an operating voltage signal SOP. The capacitance measurement circuit 1 includes a multi-power supply circuit 12, a charging and discharging path 14, a comparator circuit 16 and a processing circuit ...
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The invention relates to a capacitance measuring circuit, which is used for measuring a capacitance of a capacitor to be measured that is coupled to an endpoint provided with an operating voltage signal. The capacitance measuring circuit comprises a multi-power source supply circuit, a charge and discharge path and a comparator circuit, wherein the multi-power source supply circuit is used for responding a control signal and selectively providing one of a plurality of power source voltage signals as an output voltage signal to be output; the charge and discharge path is used for providing theoutput voltage signal with a first voltage level for charging the capacitor to be measured and the output voltage signal with a second voltage level for discharging the capacitor to be measured so asto control the level of the operating voltage signal; and the comparator circuit receives and compares the operating voltage signal and a reference voltage signal to correspondingly generate digital signals to indicate the capacitance of the capacitor to be measured. The invention also provides a comprehensive control circuit applying the capacitance measuring circuit.
Description
Technical field [0001] The invention relates to a capacitance value measuring circuit, and more particularly to a capacitance value measuring circuit which can be integrated with a display driver circuit. Background technique [0002] Traditionally, mechanical switches are mostly used to realize user control interface devices. Since the traditional mechanical switch needs to be in direct contact with the user before it can be operated in response to the user's control command, the traditional mechanical device has the disadvantage of being prone to structural damage during the user's operation. [0003] In the current era of rapid technological development, touch switches already exist. Traditionally, the touch switch is, for example, a capacitive switch, which is controlled by sensing the change of the capacitance value of the capacitance to be measured with the proximity of the user. In the prior art, a capacitance value measuring circuit is used to sense the capacitance value ...
Claims
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IPC IPC(8): G01R27/26G09G3/36
Inventor 吴宗霖
Owner RAYDIUM SEMICON