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:
Sep. 10, 2019
Filed:
May. 13, 2016
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Xin Zhao, Austin, TX (US);
Bradley A. Lambert, Austin, TX (US);
Xiaofan Fei, Austin, TX (US);
Eric J. Swanson, Buda, TX (US);
CIRRUS LOGIC, INC., Austin, TX (US);
Abstract
A headset power management system provides robust and low-power operation by detecting various connection conditions by measuring a voltage at the microphone terminal with and without injection of current from the headset. A power management circuit controls an operating state of the headset using a microphone terminal voltage detector and can determine whether a short circuit is present indicating a connection to a device that does not have a microphone input, a negative polarity voltage is present indicating that the device may be determining a connection and type of the headset using the microphone terminal, a normal connection, or whether the headset is not connected to a device at all. Depending on the connection state, some or all of the headset electronics may be disabled until a normal connection is detected. For example the microphone processing circuits may be disabled if the connection does not support a microphone input.