The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 2011
Filed:
Mar. 16, 2009
Michael Mueck, Andover, MA (US);
Ronald F. Cormier, Jr., Tucson, AZ (US);
Michael Mueck, Andover, MA (US);
Ronald F. Cormier, Jr., Tucson, AZ (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A capacitance measurement system precharges first terminals (---) of a plurality of capacitors (--), respectively, of a CDAC (capacitor digital-to-analog converter) () included in a SAR (successive approximation register) converter () to a first voltage (V) and pre-charges a first terminal (-) of a capacitor (C) 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 (C). A SAR converter converts the first voltage to a digital representation (DATA) of the capacitor. The capacitance can be a touch screen capacitance.