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:
Feb. 26, 2013
Filed:
Jun. 15, 2010
Steven R. Tom, Dallas, TX (US);
Leland Scott Swanson, McKinney, TX (US);
Roy Alan Hastings, Allen, TX (US);
Steven R. Tom, Dallas, TX (US);
Leland Scott Swanson, McKinney, TX (US);
Roy Alan Hastings, Allen, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An embodiment of the invention provides a method for continuously detecting when a USB client device may be charged according to a BCS charging standard. Power is supplied from a USB host device to the USB client device with a first current limit. Next, the USB host device monitors data lines D+ and D− for a first part of a handshake. When the first part of the handshake is detected, a second part of the handshake is provided by the USB host device indicating that the USB client device may be changed according to the BCS charging standard. All current sources and all voltage sources that are coupled to the data lines D+ and D− are decoupled from data lines D+ and D− after the handshake is complete. After the data lines are decoupled, communication may begin between the USB host device and the USB client device.