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Method for enabling 5-V power on USB ports during S5 mode for desktop motherboards

IP.com Disclosure Number: IPCOM000146658D
Publication Date: 2007-Feb-19
Document File: 2 page(s) / 19K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for enabling 5-V power on universal serial bus (USB) ports during standby level-5 (S5) mode for desktop motherboards. Benefits include improved functionality.

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Method for enabling 5-V power on USB ports during S5 mode for desktop motherboards

Disclosed is a method for enabling 5-V power on universal serial bus (USB) ports during standby level-5 (S5) mode for desktop motherboards. Benefits include improved functionality.

Background

      “Universal Serial Bus Specification”, Revision 2.0, dated April 27, 2000, is published by USB Implementers Forum, Inc.

      Conventionally, USB is widely used with desktop and laptop computers for connecting peripheral devices. Cellular phone manufacturers have invented USB devices and chargers that add functionality to their phones. However, USB devices are functional only when the desktop is in S0 mode (powered ON) or in stand-by modes S3 and S1.

Description

            The disclosed method uses the 5-V standby mode to supply power to the USB ports when in S5 mode (powered OFF). This feature can be enabled or disabled in the basic input/output system (BIOS) menu if the user does not want the motherboard to support this feature. The method enables some portable devices to be powered ON without using an AC wall outlet and provides ease of access to the user.

      The connection on far right of the schematic is connected to one USB port. The integrated circuit, Q1H1, functions as a switcher between VCC-5V and 5V-standby, depending on th...