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EVM430-FR6043: question aboue EVM430-FR6043 algorithm

Ben Qin
Intellectual 2690 points
Part Number: EVM430-FR6043

Hi Team,

There's an issue from the customer need your help:

I have two questions in the document "MSP430FR604x Ultrasonic Liquid Flow Measurement Algorithm Detailed Explanation". Is this how to calculate the sampling rate in dToF?

Another question is how to set the specific values ​​of these coefficients? For example, threshold, where is it used?

Best Regards,

Ben

  • 0
    TI__Genius 15690 points

    Hi Ben,

    The sampling rate is that number that you've highlighted in the USS GUI. So in that equation you should be able to set sampling rate as 1MHz to calculate DToF.

    As for the coefficients in that document, I am working with our China team to answer that as I am currently unable to find the english version of that document. Please anticipate a response within 2 days. Thanks

  • 0
    TI__Mastermind 39235 points

    Hi Ben,

    Ben Qin said:
    Is this how to calculate the sampling rate in dToF?

    The number 6 calculate dTOF formula is not correct. 

    The correct one shows as below.

    dTOF = δ / sample_rate = -ψ/(ω*sample_rate)

    Ben Qin said:
    Another question is how to set the specific values ​​of these coefficients? For example, threshold, where is it used?

    μ is envelope crossing threshold. Threshold is calculate from μ in software.

    tadc_delay should be gap between pulse start and ADC capture. 

    δik is calculated in the page 8 point 1. 

    fsample is ADC sampling frequency.

    constant should be absTOF additional delay. 

    Best regards,

    Cash Hao

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