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. 23, 2013
Filed:
Aug. 11, 2009
Jiandong Yang, Pleasanton, CA (US);
Jiandong Yang, Pleasanton, CA (US);
Other;
Abstract
One embodiment of an apparatus for capacitive sensing and capacitive measuring having a digital circuitry () which has a digital input port Pcommunicating with a capacitive sensing element (). A resistance element () forms an electrical pathway between the sensing element and a signal generator () by electrically communicating with both. The signal generator outputs adjustable singles to charge and discharge the sensing element. The voltage Vc of the sensing element at the input port Pwill cause logic level change between '1' and '0' inside the digital circuitry when passing through the logic threshold of the digital circuit. The digital circuitry measures the time between the logic level changes and the reference points of the signals, and then calculates the capacitance or the capacitance change. The digital circuitry can be a microcontroller and the signal source can be the microcontroller's output port. Other embodiments are described and shown.