发明名称 |
Capacitance measurement system and method |
摘要 |
A capacitance measurement system precharges first terminals (21-0 . . . 21-k . . . 21-n) of a plurality of capacitors (25-0 . . . 25-k . . . 25), respectively, of a CDAC (capacitor digital-to-analog converter) (23) included in a SAR (successive approximation register) converter (17) to a first voltage (VDD) and pre-charges a first terminal (3-j) of a capacitor (CSENj) to a second voltage (GND). The first terminals are coupled to the first terminal of the capacitor to redistribute charges therebetween so as to generate a first voltage on the first terminals and the first terminal of the capacitor, the first voltage being representative of a capacitance of the first capacitor (CSENj). A SAR converter converts the first voltage to a digital representation (DATA) of the capacitor. The capacitance can be a touch screen capacitance.
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申请公布号 |
US8368409(B2) |
申请公布日期 |
2013.02.05 |
申请号 |
US201113151712 |
申请日期 |
2011.06.02 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED;MUECK MICHAEL;CORMIER, JR. RONALD F. |
发明人 |
MUECK MICHAEL;CORMIER, JR. RONALD F. |
分类号 |
G01R27/26 |
主分类号 |
G01R27/26 |
代理机构 |
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地址 |
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