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MSP430I2040: Maximum dynamic range

Kien
Expert 4031 points
Part Number: MSP430I2040


Hi,

What are the maximum dynamic ranges for CT-based and Rogowski-based solutions?

  • 0
    TI__Mastermind 49692 points
    Hi Kien,

    The dynamic range for the MSP430i2040 is 2000:1 across the operating temperature range.

    Regards,

    James
  • 0 in reply to James Evans
    TI__Expert 4031 points
    Hi James,
    Thanks a lot for your response.
    In order to save cost and space, customer wants to remove the TVS protection at the input and they will use just 1/3 of the dynamic range. If they do so, how will the accuracy be affected at 1% loading?
  • 0 in reply to Kien
    TI__Mastermind 49692 points

    Kien said:
    In order to save cost and space, customer wants to remove the TVS protection at the input.

    I would definitely not recommend removing the protection devices. Otherwise, voltage spikes from noise or load connections/disconnections could damage the device.

    Kien said:
    They will use just 1/3 of the dynamic range. If they do so, how will the accuracy be affected at 1% loading?

    That's hard to predict but they can test it. If they're using 1/3 of the dynamic range, then I would just recommend that they try to leverage the entire Full-Scale Range (FSR) of the SD ADC inputs across this range. Typically, we use the maximum RMS voltage and RMS current(s) and the max FSR to determine what the passives (e.g. burden resistor for CTs or voltage divider for measuring AC voltage) should be.

    Have you promoted the Energy Measurement Design Center (EMDC) GUI and software library to the customer? This tool supports both CT and Rogowski Coil current sensors. It will also automatically calculate the maximum sensor output voltage (based on the passives, sensor specs, and max expected voltage or current) and the max FSR for the device selected for easy comparison.

    Accelerate your metering design with the new Energy Measurement Design Center and software library for MSP430™ MCUs

    Regards,

    James

  • 0 in reply to James Evans
    TI__Mastermind 49692 points
    Due to the upcoming US holidays, I'll be out of office from now until January 2nd. Unfortunately, responses will be delayed, so we appreciate your patience.

    Regards,

    James
  • 0 in reply to James Evans
    TI__Expert 4031 points
    James,
    Yes, I did promote EMDC to customer. That's a great tool.
    I wish you a joyful holidays with your loved ones.
  • 0 in reply to Kien
    TI__Mastermind 49692 points

    Kien said:
    Yes, I did promote EMDC to customer. That's a great tool.

    That's great to hear. Thanks for your feedback. Let us know if they end up using it.

    Kien said:
    I wish you a joyful holidays with your loved ones.

    Thanks, Kien. I really appreciate it. Wishing you the best as well. Talk to you soon!

    Regards,

    James

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