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I2C  No Acknowledgement - Device Power up - 8 bit addressing

Question asked by raymondcarter Employee on Sep 5, 2013
Latest reply on Sep 5, 2013 by raymondcarter

ADV7182  - A customer is following the correct power sequencing recommended in the datasheet however they are not able to communicate with the chip through I2C

 

The following image shows a snapshot of the power up sequence, the order is as follows:

 

  1. The 3.3v supply starts
  2. The 1.8v supply starts
  3. The power-down pin released
  4. Finally the reset line

 

 

However the chip is not acknowledging the address 0x40 (ALSB pulled down)

  

Do you have any recommendations?

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