Capacitive touch circuit

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United States of America Patent

PATENT NO 8330735
APP PUB NO 20110011717A1
SERIAL NO

12575830

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Abstract

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A capacitive touch circuit includes a single comparator, a reference voltage control unit, a resistance adjusting unit, a delay unit, and a relaxation oscillation control unit. The comparator has a first input terminal, a second input terminal, and an output terminal. The reference voltage control unit is electrically connected to the second input terminal and includes a high level voltage source, a low level voltage source, and a voltage switching controller. The voltage switching controller electrically connects either the high level voltage source or the low level voltage source to the second input terminal of the single comparator according to an output signal of the single comparator. The relaxation oscillation control unit is electrically connected to the resistance adjusting unit, the delay unit, and the reference voltage control unit. The relaxation oscillation control unit outputs a relaxation oscillation signal, and the frequency of the relaxation oscillation signal varies according to the resistance set by the resistance adjusting unit.

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Patent Owner(s)

Patent OwnerAddress
SONIX TECHNOLOGY CO LTDCHUPEI CITY HSINCHU

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chiu, Chun-Yen Miao Li County, TW 2 7
Lin, Chien-Liang Hsin Chu, TW 85 468

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