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ADV7340 is sending NACK on I2C

Question asked by Neelam on Jun 28, 2016
Latest reply on Jun 29, 2016 by Neelam

In our custom Design we are using ADV7340 .In one board it is working fine but in one board we are facing problem in this encoder

VDD_IO is 3.3V and VDD is 1.8V. Proper power on sequencing has been done and 1.8V rail is coming after 3.3V by 750u-sec. Still it is sending NACK on device address itself.

SDA, SCL, and ASLB pins are pulled-up to VDD_IO by 4.5k Ohm resistors. Kindly help out.