Invention Grant
US07644217B2 Detecting connection to a USB host or hub without using an extra status input
有权
检测到USB主机或集线器的连接，而不使用额外的状态输入
- Patent Title: Detecting connection to a USB host or hub without using an extra status input
- Patent Title (中): 检测到USB主机或集线器的连接，而不使用额外的状态输入
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Application No.: US11681253Application Date: 2007-03-02
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Publication No.: US07644217B2Publication Date: 2010-01-05
- Inventor: Daniel Butler , Hartono Darmawaskita
- Applicant: Daniel Butler , Hartono Darmawaskita
- Applicant Address: US AZ Chandler
- Assignee: Microchip Technology Incorporated
- Current Assignee: Microchip Technology Incorporated
- Current Assignee Address: US AZ Chandler
- Agency: King & Spalding L.L.P.
- Main IPC: G06F13/00
- IPC: G06F13/00 ; G06F13/42 ; H03K17/16 ; G06F13/14
Abstract:
A low power Universal Serial Bus (USB) capable device uses a weak pull-up resistance that is coupled to at least one data line of the USB for detection of when the USB capable device is connected to a USB host or hub. When the USB capable device is not connected to the USB host or hub, USB peripheral, including the USB transceiver, USB voltage regulator, serial interface and/or USB logic circuits required for USB operation may be powered down to conserve power drawn by the USB capable device. When the USB capable device is connected to the USB host or hub, a voltage from the weak pull-up will be significantly reduced, thus signaling that the USB peripheral and associated circuits should be powered up for normal USB operation.
Public/Granted literature
- US20080215765A1 Detecting Connection to a USB Host or Hub Without Using an Extra Status Input Public/Granted day:2008-09-04
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