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TMP124 consumption in active mode

Eduardo Ban
Prodigy 150 points
Other Parts Discussed in Thread: TMP124, REG1117A, MSP430FG4618

Would need to know what TMP124 consumption in active mode, and the SPI bus turn on and off

  • 0
    TI__Guru 63995 points

    HI Eduardo,

    We don't have any data to share with you currently.  I will have to connect this in the lab and test for you. 

    The current consumption is going to depend heavily on two things:

    1.)  How often are you reading from the TMP124?
    2.)  What is the SPI clock frequency?

    So I make sure I take data that is meaningful to you, please inform me of the conditions above that you are interested in.  My equipment is setup to run at +3.3V so unless you object that is the supply voltage I plan to use for the test.

    Regards,
    Collin Wells

  • 0 in reply to Collin Wells
    Prodigy 150 points

    The TMP124 I read every 1 sec approx.
    SPI frequency is 250 KHz or 400KHz.
    The power is 3 batteries of Li and 3.3 V regulator (REG1117A-3.3)
    This will need to determine an average consumption when this active and reading and when in standby, no shutdown.
    To calculate the measurement time maximums of TMP124, without taking regulatory considering battery power.

    Thank you very much

    EduardoBan

  • 0 in reply to Eduardo Ban
    TI__Guru 63995 points

    Hello Eduardo,

    I was able to perform the testing on the TMP124 today.  Please note that these tests were only performed on one unit and the results across all units will vary, but this should give you a good idea of what to expect.

    I setup the SPI sequence to be as continuous as possible (little delay between /CS periods).  Although this is not a realistic form of operation, I needed to do it to be sure that I wasn't reading an averaged current with the part in standby-mode part of the time and in SPI-operation part of the time.

    Measured Currents:

    Standby - 53uA
    250kHz SPI - 75uA
    400kHz SPI - 87uA

    Please find an image of the 250kHz reads below:

    400kHz reads:

     

    Best Regards,
    Collin Wells
    Precision Analog

  • 0 in reply to Collin Wells
    TI__Guru 63995 points

    Hello,

    I forgot to add that I was using an MSP430FG4618 to generate these signals.

    Regards,
    Collin Wells
    Precision Analog

  • 0 in reply to Collin Wells
    Prodigy 150 points

    Thank you very much for the reply, I am using a system of measurement for battery-powered and needed to compare with other devices from Analog Device.

    thank you very much

    Eduardo Ban