USB静电防护BRIEFESD Protection USB 1.1 Data LinesUSB 1.1 Product Computers (desktops and laptops) Peripherals (printers, scanners, etc.) Circuit Board Handheld devices (PDAs, cell phones, MPEG players, etc.) Repeaters and hubsTECHUSB 1.1 ConnectorPWR GND D+ D- Digital still cameras USB 1.1 ControllerFigure 1. Simple USB 1.1 circuit diagram (ESD suppressors protect the data lines which have exposure to the outside world. The USB protocol uses 2 data lines).BackgroundUniversal Serial Bus (USB) products (PCI adapter cards, digital cameras, peripherals, etc.) can be susceptible to ESD events when the cable is disconnected from the data port. The ESD pulse can be introduced directly into the open port, or into the disconnected end of the cable. Either way, the integrated circuitry that ……
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