BISTONE PORT POWER CONTROLLER FOR USB HUBS WITH LEGACY BATTERY CHARGE SUPPORT
First Claim
1. An interface unit comprising:
- interface circuitry including one or more data lines and at least one power line; and
power management circuitry configured to control a supply of power to the at least one power line; and
wherein in response to detecting a device has been connected to the interface circuitry, the interface unit is configured to;
convey a first signature to the device via the one or more data lines; and
in response to determining a predetermined response to the first signature is not received from the device;
remove power from the power line;
restore power to the power line at a first predetermined time subsequent to removing said power; and
convey a second signature different from the first signature to the device at a second predetermined time subsequent to restoring said power.
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Accused Products
Abstract
A system and method for efficient power management of peripheral port connections. A USB hub core is configured to detect the presence of a legacy peripheral device on a downstream port when a corresponding USB host is in a non-operational state. The USB hub core chooses a battery charger signature for the peripheral device and subsequently directs an external port power controller to simulate disconnection/reconnection of the peripheral device. The chosen signature is presented to the peripheral device. If the signature matches the expected value of the peripheral device, then the peripheral device charges its battery. Otherwise, the process of choosing a different signature and simulating disconnection/reconnection is repeated.
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Citations
20 Claims
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1. An interface unit comprising:
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interface circuitry including one or more data lines and at least one power line; and power management circuitry configured to control a supply of power to the at least one power line; and wherein in response to detecting a device has been connected to the interface circuitry, the interface unit is configured to; convey a first signature to the device via the one or more data lines; and
in response to determining a predetermined response to the first signature is not received from the device;remove power from the power line; restore power to the power line at a first predetermined time subsequent to removing said power; and convey a second signature different from the first signature to the device at a second predetermined time subsequent to restoring said power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An interfacing system method, the method comprising:
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controlling a supply of power to at least one power line; and in response to detecting a device has been connected to interface circuitry including one or more data lines and the at least one power line; conveying a first signature to the device via the one or more data lines; and in response to determining a predetermined response to the first signature is not received from the device; removing power from the power line; restoring power to the power line at a first predetermined time subsequent to removing said power; and conveying a second signature different from the first signature to the device at a second predetermined time subsequent to restoring said power. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A power management controller comprising:
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an interface coupled to one or more data lines and at least one power line; a power logic unit configured to control a supply of power to the at least one power line; wherein in response to detecting a device has been connected to the interface, the power logic unit is configured to; convey a first signature to the device via the one or more data lines; and in response to determining a predetermined response to the first signature is not received from the device; remove power from the power line; restore power to the power line at a first predetermined time subsequent to removing said power; and convey a second signature different from the first signature to the device at a second predetermined time subsequent to restoring said power. - View Dependent Claims (18, 19, 20)
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Specification