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ADV7511W all registers read 0x13,why?

hi, i have a problem,when i write adv7511w by i2c with address 0x72,it seems to be normal,but when i read from adv7511w,all registers eq 0x13,i dont know why?

and,i find many users have faced this problem,so,how to fix it?

i'm sure the hpd pull high ,and my schematic as follows:



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[edited by: NewBee at 8:58 AM (GMT 0) on 2 Sep 2019]
Parents in reply to PoornimaSubramani

One thing to keep in mind is we use 8-bit addressing while some drivers use 7-bit addressing.  If your driver expects 7-bit addressing then you have to right the 8-bit address by one before sending it to the driver.  Just a thought.  0x74 >> 1 -> 0x39

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  • FormerMember
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in reply to PoornimaSubramani

One thing to keep in mind is we use 8-bit addressing while some drivers use 7-bit addressing.  If your driver expects 7-bit addressing then you have to right the 8-bit address by one before sending it to the driver.  Just a thought.  0x74 >> 1 -> 0x39

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