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DP83822IF: Power consumption, how to think about max value

Oba
Genius 17325 points
Part Number: DP83822IF

Hello

There are some power consumption data in the datasheet.
The below is from Table 10-1, "3.3-V AVD/CT AND 3.3-V VDDIO" case.

And there are power consumption data at -40C, 25C and 125C. 
I think this power consumption data is TYP (nominal voltage, not including piece-to-piece variation) data for each temperature.

My customer would like to know the MAX power consumption(highest voltage, including piece-to-piece variation) value at 85C.
Is it available?
If it isn't available, how to think of it? Could you please tell me any rough value?

Regards,
Oba

  • 0
    TI__Guru**** 190999 points

    Hello Oba, 

    Thank you for the query.

    We do not have any additional power numbers other than the datasheet numbers to share.

    In the datasheet, there are numbers for different VDD and VDDIO voltages.

    You should be able to use these numbers to derive on an indicative value.

    Regards,

    Sreenivasa

  • 0 in reply to Kallikuppa Sreenivasa
    TI__Genius 17325 points

    Hello Sreenivasa,

    I understand we don't have any data. 

    But the customer don't need exact number. 
    If we can say it should be ness than xxxx mW at least, it's enough.
    Don't you have any suggestion?

    For example, it is 317mW at 125C from the datasheet.
    Is there a possibility to exceed this value at 85C?
    317mW is acceptable value for them. If we can say it should be less than this value, it's OK for them.

    Regards,
    Oba

     

  • 0 in reply to Oba
    TI__Guru**** 190999 points

    Hello Oba, 

    I do not have a number to provide, I am doing my best to support you here.

    Although not tested, by scaling the power consumption in the data sheet similar consumption numbers that you have mentioned above could be expected.

    At 85C and 3.45V supply, based on the power scaling between 1.8 ( 126) to 3.3V ( 260) going to 285 at 3.45 ( estimate) and drift considered for 85 ( 35), you might get 320mw which is close to the number you have specified.

    I would assume that continuous VDD/VDDIO at 25c is still configured for 3.3V and not to 3.45 by design.

    Regards,

    Sreenivasa

  • 0 in reply to Kallikuppa Sreenivasa
    TI__Genius 17325 points

    Hello Sreenivasa,

    Thanks for your reply.
    How to think about piece-to-piece variation?

    Regards,
    Oba

  • 0 in reply to Oba
    TI__Guru**** 190999 points

    Hello Oba, 

    The power consumption in the datasheet are expected to be taken over multiple devices.

    The worst case power supply variation  should be within the device specified range.

    Regards,

    Sreenivasa

  • 0 in reply to Kallikuppa Sreenivasa
    TI__Genius 17325 points

    Hello Sreenivasa,

    Do you mean the power consumption data on the datasheet is the worst case including all process variation?

    I understand the power consumption data on the datasheet is taken over multiple devices.
    But I think it doesn't necessarily mean it's the worst case. Isn't there so much piece-to-piece variation in this device?

    Regards,
    Oba

  • +1 in reply to Oba
    TI__Guru**** 190999 points

    Hello Oba, 

    Please note that based on you request  an indicative number was provided.

    But the customer don't need exact number. 
    If we can say it should be ness than xxxx mW at least, it's enough.
    Don't you have any suggestion?

    For example, it is 317mW at 125C from the datasheet.
    Is there a possibility to exceed this value at 85C?
    317mW is acceptable value for them. If we can say it should be less than this value, it's OK for them.

    Measured numbers are provided in the datasheet that customer can use. Customer may need to make measurements to arrive on the exact data he is looking for out of the datasheet numbers.

    Regards,

    Sreenivasa