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MSP-EXP432P401R: Implementing MSP430FR5994 or MSP432P401R LaunchPad

Adi Selimovic
Intellectual 560 points

Part Number: MSP-EXP432P401R

I am implementing 3-phase energy metering with requirements to have data storage up to one month, wireless and web browser as well, accuracy for U and I measurement 0.2% (>12 bits of resolution), 32 digital I/O  and so on. In addition, isolation amplifiers AMC1301 (sigma-delta modulation, differential output) will be used.

I have a doubt which LaunchPad to use, whether MSP430FR5994 (12-bit ADC, SD slot built-in, external ADCs needed to achieve required accuracy) or MSP432P401R (14-bit ADC, no SD slot). According to your experience, which approach could cause more obstacles during implementation? If you also have any other advice, I will be very thankful.

Thank you in advance,
Adi

  • 0
    TI__Mastermind 26380 points
    Adi,
    Thanks for posting!

    The product families upon which these LaunchPads are based are very different, so it really depends on what you are trying to do!
    I'd recommend doing a high level comparison of the first page of each datasheet - the MSP430FR5994 Vs MSP432P401R.

    Depending on clock speed (16MHz Vs 48MHz), Core (ARM M4F Vs MSP430), Active power, standby power etc you may be able to make your decision.
    One advantage to the FR5994 is that the embedded memory technology is FRAM, which is a very low power , easy to write memory.
    If you had any data logging you needed to do on chip, this would be the way to go.

    On the other hand the MSP432 has a powerful M4F core, with the optional floating point unit (FPU)....

    We also have other products specifically suited to 3-phase e-metering that may be worth looking into.
    Link: www.ti.com/.../EVM430-F6779

    I'll close this post for now but feel free to come back & ask us any questions you may have !

    -Priya
  • 0 in reply to Priya Thanigai
    Intellectual 560 points
    Thank you Priya,

    Taking into account requreid sampling frequency above 5 kHz, both models fulfil it (16 vs 48 MHz). Active Power as well as the Standby Current do not significantly differs. They both have 8 SPIs. I consider MSP430FR5994 LaunchPad because it has SD Card reader and I can spare time during implementation. On the other hand, I have been seing more frequently MSP432P401R in energy metering applications. That is the reason I have a doubt. In a case I choose MSP430FR5994 LaunchPad, I will also use a clock buffer connected with external ADC in order to have synchronous sampling.

    How decisive is a floating point in this case?
    I have not found informatIon about ENOB of AMC1301. That can influence eventual choice of external ADC.

    Best regards,
    Adi
  • 0 in reply to Priya Thanigai
    Intellectual 560 points
    Thank you Priya,

    Taking into account required sampling frequency above 5 kHz, both models fulfill it (16 vs 48 MHz). Active Power as well as the Standby Current do not significantly differ. They both have 8 SPIs. I consider MSP430FR5994 LaunchPad because it has SD Card reader and I can spare time during implementation. On the other hand, I have been seeing more frequently MSP432P401R in energy metering applications. That is the reason I have a doubt.

    In a case I choose MSP430FR5994 LaunchPad, I will also use a clock buffer connected with external ADC in order to have synchronous sampling. (Options are one ADC for current measurement or one ADC for both current and voltage). Plan would be to reach resolution of 13-bits by combining AMC1301 and external ADC (e.g. 16 bit SAR).

    How decisive is a floating point in these cases?

    Best regards,
    Adi

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