(ADV7280A)About the behavior of the PWRDN signal before releasing RESET

Hi 

Is there any problem if there is a case where the "RESET" terminal is temporarily released before the "PWRDWN" terminal is released at startup due to hardware restrictions?
After releasing RESET, the sequence of the data sheet is protected, so I think there is no problem.

(1) Before releasing the "PWRDWN" terminal, the "RESET" terminal is released for about 36ms.


(2) Before releasing the "PWRDWN" terminal, the "RESET" terminal is released for about 0.132ms.

Best regards

Kawa

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    •  Analog Employees 
    on Feb 4, 2021 12:06 PM in reply to donadona999s

    Hi Kawa-San,

           As per expert comment "After the 1.8V supply rails are fully asserted (up and stable),  the PWRDWN pin can be deasserted (released high).
          After the PWRDWN pin is released high, wait 5ms and then deassert the RESET (release high). 
          After the RESET pin is released, wait a further 5ms before initiating I2C communication with the ADV7282A.

    Thanks,

    Poornima

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