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MSP430FR6043: MSP430FR6043EVM_USS_Gas_Demo How to configure the pulse output frequency to 1M

qq li
Prodigy 40 points
Part Number: MSP430FR6043


Tool/software:

hi,

    When I use USS software to configure the F1 frequency, I found that the maximum frequency can only go up to 550K, I now want to use a 1M transducer for gas flow test, how do I need to modify USS_userConfig.h so that the output pulse frequency reaches 1Mhz?

  • 0
    TI__Mastermind 46765 points

    Hi,

    For gas meter application, the excitation frequency is limited in USS library to 550kHz. There is no method to change it to 1MHz. And usually, for residential gas meter application, the transducer frequency is typically below 500kHz. What is your application requirements?

    Best regards,

    Cash Hao

  • 0 in reply to Cash Hao11
    Prodigy 40 points

    We would like to try whether the whole system will have better accuracy for hydrogen concentration testing in a 1M transducer. Can you tell us if the limit of 550k excitation frequency can be modified in the code.

  • 0 in reply to qq li
    TI__Mastermind 46765 points

    Hi,

    Well, you can try to use single frequency mode first. This will allow you to set the frequency to 1M. However, I never tried it in gas meter application. I am not sure if it can work this way. 

    Best regards,

    Cash Hao

  • 0 in reply to Cash Hao11
    Prodigy 40 points

    The USS upper software F1 is configured to a maximum of 550K, what parameters need to be adjusted in USS_user Config.h besides modifying USS_PULSE_MODE=USS_PULSE_MODE_SINGLE_TONE?

  • +1 in reply to qq li
    TI__Mastermind 46765 points

    Hi, 

    Yes. Modify the USS_PULSE_MODE to USS_PULSE_MODE_SINGLE_TONE is the first step. However, on a second thought, even though you changed to single frequency mode, the USS library will also report errors and tells you its an invalid configuration. 

    I would recommend to save your time and forget to change to 1MHz in gas meter project. It is not possible for you to achieve it since you may need to change the code inside the USS library.

    Best regards,

    Cash Hao

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