资料介绍
USB静电防护BRIEF
ESD Protection USB 1.1 Data Lines
USB 1.1 Product Computers (desktops and laptops) Peripherals (printers, scanners, etc.) Circuit Board Handheld devices (PDAs, cell phones, MPEG players, etc.) Repeaters and hubs
TECH
USB 1.1 Connector
PWR GND D+ D-
Digital still cameras USB 1.1 Controller
Figure 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).
Background
Universal 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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