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:
Oct. 08, 2013
Filed:
Nov. 15, 2010
Kenneth C. Adkins, Mason, OH (US);
Kenneth C. Adkins, Mason, OH (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
Embodiments of the present invention include circuits and methods for sensing resistance. In one embodiment, a current is generated into a node. The node is coupled to a first terminal of a resistor. A second terminal of the resistor is coupled in series with a capacitance and a reference voltage. The current is turned off when a voltage on the node meets a threshold. A second voltage is detected on the node after the current is turned off. A resistance value is determined based on the first voltage on the node and the second voltage on the node. In one embodiment, the resistor is external to an integrated circuit and sensed through a single pin of the integrated circuit. The integrated circuit may include a current source, comparator, and a digital-to-analog converter.