发明名称 |
Systems and methods for providing device-to-device handshaking through a power supply signal |
摘要 |
Handshaking circuits (142) are provided in a communications cable and in a device (150) operable to be mated with the communications cable. Before a device (150) 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. |
申请公布号 |
EP2570886(A2) |
申请公布日期 |
2013.03.20 |
申请号 |
EP20120192125 |
申请日期 |
2008.06.13 |
申请人 |
APPLE INC. |
发明人 |
FARRAR, DOUG;HEYL, LAWRENCE;SANDER, BRIAN |
分类号 |
G06F1/26;G06F13/40;G06F21/81 |
主分类号 |
G06F1/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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