Systems and methods for providing device-to-device handshaking through a power supply signal
First Claim
1. A method for informing a second device it is connected to a first device, the method comprising:
- receiving a power supply signal, wherein the power supply signal has a first characteristic or a second characteristic;
detecting that the received power supply signal having the first characteristic has been received for at least a pre-determined amount of time;
after detecting that the received power supply signal having the first characteristic has been received for the pre-determined amount of time, providing a series of predetermined current pulses to the power supply signal; and
receiving the power supply signal having the second characteristic while the series of predetermined current pulses are provided on the power supply signal.
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Abstract
Handshaking circuits are provided in a communications cable and in a device operable to be mated with the communications cable. Before a device can utilize the power supply signal of such a communications channel, the two handshaking circuits must sufficiently identify one another over a power supply signal with a decreased voltage. The decreased voltage allows for a cable plug to be provided with a safe, protected power that cannot cause harm to a human. The decreased voltage also reduces the chance that a device can receive a primary power supply signal from the cable before the device sufficiently identifies itself. Accordingly, a laptop may be connected to a portable music player, but the voltage of the power supply signal provided by the laptop to the cable may be decreased on-cable until the handshaking circuit of the portable music player sufficiently performs a handshaking operation with a on-cable handshaking circuit.
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Citations
20 Claims
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1. A method for informing a second device it is connected to a first device, the method comprising:
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receiving a power supply signal, wherein the power supply signal has a first characteristic or a second characteristic; detecting that the received power supply signal having the first characteristic has been received for at least a pre-determined amount of time; after detecting that the received power supply signal having the first characteristic has been received for the pre-determined amount of time, providing a series of predetermined current pulses to the power supply signal; and receiving the power supply signal having the second characteristic while the series of predetermined current pulses are provided on the power supply signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electronic device comprising:
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an interface for receiving a corresponding connector of another device, the interface including at least one electrical contact for receiving a power supply signal; and a handshaking circuitry electrically coupled to the at least one electrical contact, the handshaking circuitry operative to; recognize the power supply signal having a first characteristic of the power supply signal; in response to recognizing the power supply signal having the first characteristic, provide a validation signal to the power supply signal, wherein the validation signal comprises a series of predetermined current pulses; and receive the power supply signal having a second characteristic while the validation signal is introduced to the power supply signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system comprising a first circuit, the first circuit comprising:
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an input node for receiving a power signal; a voltage detector for determining whether the power signal meets a voltage threshold; a timing circuit, wherein the timing circuit is enabled based on whether the voltage threshold is met and the timing circuit performs a counting operation so long as the voltage threshold is met; and a pulse generator circuit, wherein the pulse generator circuit provides a series of predetermined current pulses to the power signal after the counting operation is performed for a pre-determined amount of time. - View Dependent Claims (19, 20)
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Specification