Sonix Technology Co., Ltd.

Chien-Liang Lin

Chun-Yen Chiu

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.

Growing community of inventors

Hsinchu, Taiwan

Chien-Liang Lin