HDMI CTS认证要求

HDMI1.4 Compliance Test Specification

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TMDS通道阻抗要求

Characteristic differential impedance of the connector, for each differential TMDS pair is 100Ω ± 15%. A single excursion is permitted out to a maximum of 100ohm+/-25%.and of a duration less than 250psecs.

连接器特征阻抗要求100Ω ± 15%，允许单次偏移最大为100Ω ± 25%，持续时间小于250ps。

PCB走线阻抗控制要求

Characteristic differential impedance of the leads (cables or traces), for each adifferential TMDS pair, is 100Ω ± 5% as a average over the entire trace. Peak impedance of up to 100Ω ±10% is also permitted.

TMDS差分线阻抗平均值100Ω ± 5%，最大阻抗100Ω ± 10%。

DDC通道I2C容抗要求

source端测试：接入HPD信号，使用数字电桥测试DDC通道SCL/SDA对地容抗不超过50pF；

sink端测试：接入HDMI 5V电压，使用数字电桥测试DDC通道SCL/SDA对地容抗不超过50pF。

DDC通道具体容抗要求如下：

CEC Line容抗要求

所有HDMI端口CEC pin需连在一起，且容抗满足规范要求