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Original question:

[FAQ] MSP430F67791A: Metering data required within 100 ms with EMDC

MSP430F67791A: Metering Data required within 10ms with EMDC

Rahul Dahiya
Prodigy 130 points

Part Number: MSP430F67791A

Hello TI Team,

I am using this EMDC library to read current and voltage. Is it possible to get data of current less than 5ms and voltage in 20ms.

Thanks,

Rahul

  • +1
    TI__Mastermind 49692 points

    Hi Rahul,

    You can use the approach described in the linked FAQ thread to get data out faster than every 1 second (default). For your case, I would highly recommend waiting until a full AC cycle has been measured for both VRMS and IRMS. These values are calculated as the root-mean-square across one or more complete AC cycles. Thus, I would recommend the minimum update period (how often the results are updated and sent out) to be no less than 20 ms assuming your nominal AC input frequency is 50 Hz. Keep in mind that depending on the number of phases, ADC sampling frequency, etc. you may need to increase the UART baud rate to ensure that the data gets sent out fast enough.

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