发明名称 |
SYSTEMS AND METHODS FOR PROVIDING DEVICE-TO-DEVICE HANDSHAKING THROUGH A POWER SUPPLY SIGNAL |
摘要 |
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. |
申请公布号 |
WO2008156689(A3) |
申请公布日期 |
2009.07.09 |
申请号 |
WO2008US07430 |
申请日期 |
2008.06.13 |
申请人 |
APPLE INC.;FARRAR, DOUG;HEYL, LAWRENCE;SANDER, BRIAN |
发明人 |
FARRAR, DOUG;HEYL, LAWRENCE;SANDER, BRIAN |
分类号 |
G06F1/26;G06F13/40 |
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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