发明名称 |
MUTUAL CAPACITANCE SENSING USING A SELF-CAPACITANCE SENSING DEVICE |
摘要 |
Apparatuses and methods of mutual-capacitance sensing with a capacitance- sensing circuit, such as a self-capacitance sensing device (CSD). One apparatus includes an input node coupled to a capacitance sense pin to couple to a first electrode of a sense array, a transmit (TX) signal generation circuit to generate a TX signal to drive a second electrode of the sense array, logic circuitry coupled to the TX signal generation circuit and the input node. The logic circuitry is configured to selectively couple a first capacitor to the input node and a second capacitor to the input node timed with the TX signal. The apparatus further includes an analog-to-digital converter (ADC) coupled to receive a receive (RX) signal from the input node and to convert the RX signal into a digital value, the digital value representing a mutual capacitance between the first electrode and the second electrode. |
申请公布号 |
WO2014143572(A1) |
申请公布日期 |
2014.09.18 |
申请号 |
WO2014US19649 |
申请日期 |
2014.02.28 |
申请人 |
CYPRESS SEMICONDUCTOR CORPORATION |
发明人 |
LIEPOLD, CARL;VAN ANTWERPEN, HANS;KIZZIAR, JOHN;KLEIN, HANS |
分类号 |
G01R27/26 |
主分类号 |
G01R27/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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