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Cost effective USB over power sensor and system alert Disclosure Number: IPCOM000030926D
Original Publication Date: 2004-Sep-01
Included in the Prior Art Database: 2004-Sep-01
Document File: 1 page(s) / 6K

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A method is disclosed that provides an effective way of isolating USB interface problems on personal computers that are caused by excessive power draw from the attached USB device.

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Cost effective USB over power sensor and system alert

Today's systems use the USB 1.1 or 2.0 compatible communication ports to talk with a plethora of devices. These devices are spec'd at 500mA of current per device and this is often over run by each individual design and if the device does pull too much power a polly fuse or control IC will turn off the power and then the device will not work . The user of PC system has no method to tell that the device is actually not powered at the time unless the device has a light or other mechanism to indicate a lack of power . Another issue is the lack of reporting to an IT administrator that these devices are out of specification and will not operate on these systems . Examples of the devises which are known to present this problem are MP3 players which use the USB port to recharge and various non powered port hubs which attempt to divide and redistribute the power from the system port.

This is a method to sense when the polly fuse or IC chip has turned off the power connection to the system supply and the USB device . This is to be done by giving a feedback system to a GPIO which will alert if the voltage is pulled to ground . At this point the GPIO will set an alert to the system which will then run a routine which will first alert the user and next log this information into the hardware event log . Note this is done cost effectively with nearly zero cost adder to the system .

The diagram below shows the basic implement...