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:
Dec. 13, 2011
Filed:
Jul. 26, 2006
Edward A. Keehr, Pasadena, CA (US);
Edward A. Keehr, Pasadena, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
An integrated circuit within a cellular telephone has a wake mode and a sleep mode. In the wake mode, a voltage regulator supplies a regulated voltage onto a MIC BIAS terminal. This voltage biases a microphone of a headset/microphone accessory that is coupled to the cellular telephone. If the user presses a switch on the accessory, then a large current is drawn out of the MIC BIAS terminal. This switch press condition is detected by an ADC within the integrated circuit. In the sleep mode, the regulator and ADC are disabled to conserve power. A novel switch detect circuit supplies a current out of the MIC BIAS terminal at an unregulated voltage. If the user presses the switch, then the current supplied from the MIC BIAS terminal increases. This switch press condition is detected over temperature, voltage and process conditions by a special inverter in the switch detect circuit.