Measuring current consumption on mDot

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  • January 31, 2017 at 1:22 pm #16590
    kaz ola
    Participant

    Dear,

    I have a few questions about mDot and UDK development board, probably they will be easy for you to asnwer but I was unable to make my mind clear.

    1) is there any jumper that can easily be removed in UDK board so I can measure the power consumption of a running mDot with my multimeter?

    2) I find no information about the jumper place next to the mDot socket in UDK board. I’m NOT referring to the one placed next to the DB9 connector but the one placed in the opposite corner of the USB connector.

    Please let me know your opinions on both topics šŸ™‚ Have a nice day.

    January 31, 2017 at 1:38 pm #16591
    Leon Lindenfelser
    Moderator

    Hi Kaz,

    See page 47 of the following document.
    http://www.multitech.com/documents/publications/manuals/s000612.pdf
    It is between JP197 and JP98. It has 5v and 3.3v written next to it.
    To see the electrical connections, look for JP90 in area D3 of the schematic on page 55 of the document.
    The UDK2 PCB may not have a corresponding JP90 marking on it.

    Also see pages 24 and 25 of the following for power draw.
    http://www.multitech.com/documents/publications/manuals/s000612.pdf
    Sleep mode can get you down around 40uA.

    Kind regards,
    Leon

    January 31, 2017 at 2:05 pm #16592
    kaz ola
    Participant

    Thanks Leon,

    I understand the 40 uA value, thanks.

    So, as far as I understand since I’m not good at reading datasheets, for 3.3V operation I have to desolder that tiny R118 registor (0 ohms) and put my multimeter between JP90.1 and JP90.2.

    Will this affect somehow the Arduino headers which work at 5V?

    What about the other jumper question? The one next to mDot?

    Thanks for your time.

    January 31, 2017 at 2:50 pm #16594
    Leon Lindenfelser
    Moderator

    Hi Kaz,

    Correct…
    “So, as far as I understand since Iā€™m not good at reading datasheets, for 3.3V operation I have to desolder that tiny R118 registor (0 ohms) and put my multimeter between JP90.1 and JP90.2.”

    It will not affect the Arduino header voltages.

    Sorry… the jumper next to the mDot by the right angle antenna holder grounds or un-grounds the right angle antenna holder.

    Kind regards,
    Leon

    February 2, 2017 at 5:36 am #16626
    kaz ola
    Participant

    Perfect answer Leon, thanks a lot! šŸ™‚

    February 7, 2017 at 10:23 am #16750
    kaz ola
    Participant

    [THREAD SOLVED]

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