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Original question:

MSP430I2040: Calculations done by EMDC PC software

MSP430I2041: Design of three phase meter with i2041

manish
Prodigy 60 points
Part Number: MSP430I2041
Other Parts Discussed in Thread: MSP430F67641A, MSP430F6779A

Tool/software:

Is there a fundamental technical issue with using two i2041 devices for a three phase meter? First device has 4 SD channels - two V/I channels can fit in that. And the second i2041 can support the third phase and possibly the interface to an external wireless communications module.

Please advise on the energy metering part - can two i2041 devices be used for 3-phase metering? Would you suggest approaching it differently? The system does not need LCD, and there is not a lot of space on the board to use the relatively larger 100-pin 3-phase metering ICs in MSP430 family. Thank you.

  • +1
    TI__Mastermind 38775 points

    Hi Manish,

    Not recommend to use two i2041 device to design three phase meter. Higher recommend to use MSP430F6779A or MSP430F67641A, please refer to our slide for meter E-meter_and_EMDC_Overview_TI.pdf

  • 0 in reply to Gary Gao
    Prodigy 60 points

    Since this is not for a revenue grade metering device, the idea was to make a scalable system that could go from 1-phase to N-phase monitoring where N could be more than 3 also. With that, do you see any concerns with using a multiple of i2041 devices to enable this? The 3-phase metering chips have at least 100 pins each, and we do not need LCD, and would like to keep price of the system low without a significant compromise on the performance (class 1 is okay). In contrast, i2041 is 32 pins only.

    With that, do you see this to be feasible? Or still not worth pursuing or recommending? Yes, the 16.384MHz clock will be independent, and might cause some inconsistencies... anything else to consider besides this?

    Thank you. 

  • 0 in reply to manish
    TI__Mastermind 38775 points

    I think that is hard to do it, because the 3 phase power lines are affect each other  not independent. It is critical to do the sample of the voltage and current at the same time that is why we put lots of the ADCs in the F6779A devices.

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