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:
Mar. 18, 2014
Filed:
Jan. 20, 2010
Tsung-fu Lin, Hsinchu Hsien, TW;
Tso Min Chen, Hsinchu Hsien, TW;
Yi Cheng Hsieh, Hsinchu Hsien, TW;
Guo-kiang Hung, Hsinchu Hsien, TW;
Tsung-Fu Lin, Hsinchu Hsien, TW;
Tso Min Chen, Hsinchu Hsien, TW;
Yi Cheng Hsieh, Hsinchu Hsien, TW;
Guo-Kiang Hung, Hsinchu Hsien, TW;
MStar Semiconductor, Inc., , TW;
Abstract
A touch sensing method and associated circuit are provided. In one aspect, a touch control circuit includes a first current source, a second current source, a plurality of switches, a hysteresis comparator, a frequency divider and a flip-flop. The switches are couple to a plurality of external contact points. The hysteresis comparator is coupled to a first reference comparison voltage and a second reference comparison voltage. Each of the external contact points is selectively coupled to an input terminal of the hysteresis comparator through the switches. The first current source and the second current source are coupled to the input terminal of the hysteresis comparator to generate a sensing voltage. The hysteresis comparator compares the sensing voltage with the first reference comparison voltage and the second reference comparison voltage to generate a hysteresis comparison output to control the first current source or the second current source.