HDMI接口的静电放电保护.pdf

ESD Protection for HDMI Interfaces Liu Xiaohao, Yang Jie Information School Wuhan University of Technology, Wuhan (430063) E-mail ：hunch5@163.com Abstract The HDMI 1.3 specification supports the demand of future HD display devices for higher resolution and higher frame rates with a color depth up to 48-bit by doubling bandwidth from 165 MHz (4.95 Gbps) to 340 MHz (10.2 Gbps) of the previous HDMI 1.2 specification. The hot-plugging capability of HDMI ports makes ESD protection a must. In this paper, various ESD protection options are investigated, and a fully-integrated interface IC providing highest ESD- and back drive protection as well as the required level shifting for the I²C, CEC and hot-plug lines is presented. Keywords: ESD Protection HDMI TVS 1. Introduction The High Definition Multimedia Interface (HDMI) video signals are transmitted on very high speed differential pairs. These lines are susceptible to electrostatic discharge (ESD) either directly from a user or from plugging a charged cable into the port. In order to ensure the functionality of this port, consumer electronics manufacturers require that HDMI ports be ESD hardened, often to the IEC61000-4-2 ESD standard. A level 4 discharge would require withstanding a ±15kV air and ±8kV contact discharge. In order to meet this stringent standard, external protection devices at the port entrance are required. Ease of use for such a complex interface implies a certain durability and ruggedness in the consumer electronics environment. Delicate signaling and precise protocols must endure serious