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MSP430FR6047: About USS

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Replies: 2

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Part Number: MSP430FR6047

Hello,

I have four questions.

1.Do you have data on how long it takes to detect the flow rate after receiving the waveform at the ADC?

2.What is the maximum time (length of waveform below) that the ADC can capture and calculate the flow rate?

3.Is linear interpolation used in the flow calculation?(I would like to know what type of interpolation)

4.What parameter should I change in the GUI when using a different transducer than the one used in TIDM-1019 with the EVM430-FR6047?

Regards,

U-SK

  • Hello U-SK,

    I have reached out to our USS expert for help on this topic.

    Dennis Lehman

  • Hello U-SK,

    1. The exact time depends on the capture duration. You can look at the timing diagram in "Figure 31. Profile of Current Consumption During Duration of Measurement" of TI the Design for water flow measurement's document at https://www.ti.com/tool/TIDM-02005 -> www.ti.com/.../tidues5. For the configuration provided, it takes around 560 usec.

    2. This also depends on some of the configuration settings in the Demo project. For the default settings, it is 330 samples. You can find the definition in USS_userConfig.h. This is equivalent to > 80 usec with 4 MHz sampling.

    #define USS_SW_LIB_APP_MAX_CAPTURE_SIZE 330

    It can be set to a value as large as 620. You can find the information in USS_userConfig.h & look for USS_SW_LIB_APP_MAX_CAPTURE_SIZE.

    U-SK
    3.Is linear interpolation used in the flow calculation?(I would like to know what type of interpolation)

    3. It is not clear what you are asking here. Are you referring to the value reported in between 2 measurements? If so, the SW returns each of the measurements as estimated. There is no filtering done on the measurements.

    4. You can find information about setting the configuration in the Quick Start Guide at http://www.ti.com/lit/slau810. Sections 4.2 & 4.3 has good information on how to set the configuration parameters for custom transducers.

    Srinivas

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