TMDS261B 检测和借口判断
时间：10-02
整理：3721RD
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TMDS261B,用I2C选择好端口后,不接入设备,I2C总线不能拉高,为低电平,现在客户通过 HDMI 不直接到 TV,中间接功放,这样有没有问题,客户原文如下:
If an input channel is selected, and not connect to TV, so there will not be a valid TMDS clock is detected, right? In this condition, what is the state of DDC_I2C? External pull high resistor could pull high DDC_I2C to 5V?? As our test, if not connect to TV, the selected channel's DDC_I2C could be pull high to 5V with external pull high resistor. Why?
正如客户所讲,如果此开关只能接 TV 等终端,而不能接入中间级,有没有什么方案解决此问题,谢谢!
1. DDC请参考数据手册中DDC I2C Function Description 和 DDC I2C Behavior 的详细介绍。
2. 中间接运放做什么用？什么讯号？什么型号的运放？