Method and system for supplementing current during enumeration of a USB device
First Claim
1. A device connection architecture for enumerating a universal serial bus (USB) device comprising:
- a bus for supplying a current to said USB device;
a current mixer coupled to said bus;
a chargeable power source coupled to said bus;
wherein said current mixer is configured to allow said bus to charge said chargeable power source during a first time interval and wherein said chargeable power source is configured to discharge a supplementary current during a second time interval, said supplementary current being mixed with said current from said bus for supplying an enhanced current greater than 100 milliamps to said USB device during enumeration of said USB device; and
a control logic for switching from charging to discharging of said chargeable power source.
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Accused Products
Abstract
A method and device for supplementing current from the USB bus for enumerating USB devices that require additional current beyond that allowable by USB bus specification. A chargeable power source, such as a capacitor or rechargeable battery, is supplied to the enumeration circuitry and is charged from the USB bus for an initial period of time. The charged power source is then discharged to supplement the allowable current available for enumeration during a second period of time. It is during this second period of time that the enumeration takes place. The circuitry may exist in the USB device or may be supplied separately as a power monitor or power maintenance chip or device.
43 Citations
20 Claims
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1. A device connection architecture for enumerating a universal serial bus (USB) device comprising:
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a bus for supplying a current to said USB device; a current mixer coupled to said bus; a chargeable power source coupled to said bus; wherein said current mixer is configured to allow said bus to charge said chargeable power source during a first time interval and wherein said chargeable power source is configured to discharge a supplementary current during a second time interval, said supplementary current being mixed with said current from said bus for supplying an enhanced current greater than 100 milliamps to said USB device during enumeration of said USB device; and a control logic for switching from charging to discharging of said chargeable power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for enumerating a USB device comprising:
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charging a chargeable power source in a charging state coupled to a USB bus during a first time interval with current supplied by said USB bus; switching from said charging state to a discharging state; and discharging said power source in said discharging state during a second time interval, wherein resultant discharge current augments said current from said USB bus to generate an enhanced current of greater than 100 milliamps, and wherein said enhanced current is made available to a USB device during enumeration. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A device comprising:
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a chargeable power supply for charging from a bus during a first time interval commencing upon a bus device being coupled to said bus and for discharging discharge current during a second time interval, wherein said second time interval comprises an enumeration process; a current mixer coupled to said chargeable power supply and for coupling to said bus device, said current mixer for supplying current from said bus to said bus device during said first time interval and for supplying current from said bus in combination with said discharge current during said second time interval, and wherein said current supplied during said second time interval exceeds 100 milliamps; and control logic coupled to control said current mixer and for switching from charging to discharging of said chargeable power source. - View Dependent Claims (17, 18, 19, 20)
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Specification