公开(公告)号：US20140351622A1

公开(公告)日：2014-11-27

申请号：US14328091

申请日：2014-07-10

Applicant: Apple Inc.

Inventor： Doug Farrar ,  Lawrence Heyl ,  Brian Sander

IPC: G06F1/26

CPC classification number: G06F1/266 ,  G06F13/4081 ,  G06F21/81 ,  Y02D10/14 ,  Y02D10/151

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.

Abstract translation: 握手电路设置在通信电缆中以及可操作地与通信电缆配合的设备中。 在设备可以利用这种通信信道的电源信号之前，两个握手电路必须通过具有降低的电压的电源信号彼此充分地识别。 电压降低允许电缆插头具有不会对人造成危害的安全受保护的电源。 降低的电压还降低了器件在器件充分识别自身之前可以从电缆接收主电源信号的机会。 因此，笔记本电脑可以连接到便携式音乐播放器，但是笔记本电脑提供给电缆的电源信号的电压可以在电缆上减小，直到便携式音乐播放器的握手电路充分地执行握手操作 电缆握手电路。