SN65DP159RSB的DDC读取不到EDID
时间:10-02
整理:3721RD
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我的MCU通过SN65DP159的DDC通道读取显示器的EDID,始终读取不到,示波器测量,SN65DP159的LINK端DDC没有I2C信号,但是SN65DP159的SRC端是有DDC信号的。请问有哪些方面会导致DDC信号出问题?
不知您的问题解决了没?
想确认下DP159的SCL_SRC和SDA_SRC是怎么连接的,是bypass,还是和source端接上? 最好把DP159的电路发过来看下。
另外,您可以参考下datasheet中的Figure 30&31的两个应用,note1 需要注意:
Note 1: For applications where the GPU or Sink does not support clock stretching the DDC lines from the GPU/DP TX should bypass the SCL_SRC and SDA_SRC but still connect to the SCL_SNK and SDA_SNK pins on the DP159.
Note that if the GPU/DP TX cannot support the 5V DDC lines from the connector, a level shifter is needed to step
down the 5V signals to the voltage level the GPU/DP TX can support.