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MSP430I2041: TIDM-SERVER-PWRMON Calibrator GUI tool - any pre-processing of data from MSP

pathfinder
Genius 12790 points
Part Number: MSP430I2041

Support,

I am using the TIDM-SERVER-PWRMON code and the associated Calibrator GUI. Does the Calibrator tool do any pre-processing of values sent from the MSP?  I'm interested in all the values sent but I'm more interested in what it does with the Power Factor?

Regards,

Marc

  • 0
    TI__Genius 13215 points
    Hi Pathfinder,

    My team member will check you question and reply you soon.
  • 0 in reply to Wei.Jetim Zhao
    TI__Genius 12790 points

    Wei,

    Thanks for the response.  I'll wait for the response.  Meantime, I have some live/captured data which shows where my question comes from.

    I am using test equipment to pre-set the load, reactive.  The GUI correctly shows 0.072L, and the value sent from MSP-->PC = 0xFD30 (64816 = 6.4816).  How does the GUI calculate 0.072L from this?

    How does 0xFD30 = 0.072L?

    Thanks,

    Marc

  • 0 in reply to pathfinder
    TI__Mastermind 49692 points

    Marc,

    The power factor (PF) value sent from the MSP430 to the PC GUI is correct. It's a 16-bit value that's in 2's complement form here. Thus, it needs to be converted.

    0xFD30 = 1111 1101 0011 0000

    Invert the bits.

    0x02CF = 0000 0010 1100 1111

    Add 1.

    0x02D0 = 0000 0010 1101 0000

    Convert hexadecimal to decimal and add the negative sign.

    0x02D0 = -720

    Since the units are 0.1 mPF, multiply -720 by 0.0001. The answer is what's shown in the GUI.

    PF = -0.072

    Regards,

    James

  • 0 in reply to James Evans
    TI__Genius 12790 points

    James,

    Thanks for the detailed response!

    Since pf is '0 to  1' does positive /negative represent different load reactance?

    Why is it negative

  • 0 in reply to pathfinder
    TI__Mastermind 49692 points
    Marc,

    A negative power factor indicates that the load is not consuming power but generating power. Since this isn't what's happening in your system, it's probably happening due to reversed current flow from switched current connections.

    Regards,

    James

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