Hi, I want to control 8 ADV7180 via I2C bus,how to archieve?
只是I2C 控制嘛? 数据线要不要合在一起用?
Hi HansXie and zhiyongzhang-
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The ADV7180 has 2 potential I2C addresses. The easiest solution would be to design your board with 4 pairs of ADV7180s with each pair using a different I2C address. The I2C address is set at power up by how the ALSB pin is tied. To access the 4 pairs you will have to multiplex the I2C clock based on which pair you want to talk to. Since the I2C clock is basically an analog signal you will have to use an analog switch along the lines of an ADG4613.
Another possible solution is to use 4 discrete I2C busses and controllers. Wastefull in my opinion but doable.
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