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TMDSEVMC6678L Activity Power Measurement

RIZUAN
Expert 1285 points
Other Parts Discussed in Thread: UCD9222, UCD7242

Hi everyone,

Now it is time for me to measure activity power measurement on my C6678 board. I've read a lot of post that use this spreadsheet (now it is in Rev. B, is there any updated version of this?)

There is one post that gave option to measure the power at power rail. I'm not sure where is this power rail, can someone point me? I'm planning to measure the power of my algorithm using NI DAQ device.

Anyone can suggest which one should I use, whether by using the spreadsheet or measuring at the power rail?

At first, I'm planning to measure the power at the DC jack but after reading the post (2nd link that I've provided), it may not the right place.

For information, I'm using Advantech Board, TMDSEVM6678L Rev. 2A.

Thanks in advance.

Rizuan

  • 0
    TI__Guru* 84110 points

    Rizuan,

    As you know, the spreadsheet is not a means of measurement, so the question is "what are you trying to find out?"

    Chad's advice in the referenced post is still valid.

    I did not find a hardware current measurement component on the EVM, but I think the Fusion tools can provide that and they are available with the UCD9222 and UCD7242.

    Measuring at the DC jack gives you power measurement that includes all the components on the board and the power drop on the voltage regulators (which should be less than 10% for the major components).

    Regards,
    RandyP

  • 0 in reply to RandyP
    Expert 1285 points

    Hi RandyP,

    Thanks for the reply.

    RandyP said:
    so the question is "what are you trying to find out?"

    I'm trying to measure the power consumption of the board when running my algorithm on 1, 2, 3, ... 8 cores of the board.

    RandyP said:
    I did not find a hardware current measurement component on the EVM, but I think the Fusion tools can provide that and they are available with the UCD9222 and UCD7242.

    Unfortunately, I don't have enough time to purchase or to study the suggested solutions.

    RandyP said:
    Measuring at the DC jack gives you power measurement that includes all the components on the board and the power drop on the voltage regulators (which should be less than 10% for the major components).

    I agree with you. But, I don't mind measuring the components power since i'm using like DDR3, timer etc.

    Chad in the post suggest to measure at the power rail. Can you point me where/what is power rail on the board? Is it kind of port/terminal where I can tap power meter/oscilloscope/NI DAQ device to measure the power?

    Many thanks.

    Kind regards,

    Rizuan

     

  • 0 in reply to RIZUAN
    TI__Mastermind 42545 points

    Hi Rizuan,

    The post that you referenced appeared to be discussing the measurement of the current consumption of the +12V supply input.  This would be the current used by all the components on the board for all voltage rails.  It would be difficult to make any assumptions about the power for the c6678 based on this measurement.  In addition you will only be measuring the power consumption for that particular board.  Due to the use of smart reflex and the expected differences across process and temperature the numbers you measure may not be the same if you ran the same test on a different EVM.  We provide the power spreadsheet to give you the maximum power requirements for all parts across process and temperature.  You can't substitute measured results for the information provided by the spreadsheet.

    Regards, Bill