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TIDA-010243: Some question about this reference design

Sveinn Jia
Expert 4905 points
Part Number: TIDA-010243
Other Parts Discussed in Thread: ADS131M08, , TIDA-010037, TIDA-010036

Hi team,

 I have some questions about this reference design:

  • In TIDA-010243, our ADS131M08 OSR is set to 512 with a sampling rate of 8KHz, can I set OSR=256 to get a 16KHz sampling rate? Will this setting affect the sampling accuracy?
  • According to our 2023 FAE summit slides, our V1.00 Library can support below analysis. Does this mean that our TIDA-010243 can also perform the following analysis? Because I see that you don’t seem to have a green dot below TIDA-010243.  Does our latest software library now support harmonic calculations? Could you share our latest slides?
  • Can this reference design provide ADC raw data (waveform analysis), with a separate SPI channel dedicated to transmitting real-time waveform data (at least 256 sampling points/cycle, 60HZ grid frequency)?
  • Can we support ANSI 1S、2S、3S、9S、12S、16S、35S、36S、45S、46S wiring methods?

Regards，

Sveinn

  • 0
    TI__Expert 4905 points

    Hi team,

    Could you help on this case?

    Regards,

    Sveinn

  • 0
    TI__Prodigy 110 points

    Hey Sveinn,

    Have some answers for you here: 

    1. Yes, you can change the OSR to 256 or even 128 and 64, increasing the sampling frequency.

      Note that faster sampling rate means higher noise (see tables in ADS131M0x datasheet showing that), which reduces the accuracy or ENOBs. 

      On the other hand, the energy calculations do some averaging so we need testing to see how 16kHz perform.

      Note that increasing to 16kHz we would need more MIPS to process the samples.

    2. We do calculate THD on M0 SDK already but we are NOT able to run FFT analysis.

    3. The current Library does not output any raw data to a separate SPI channel, but it could be set up to do so. 
    4. The SDK is being worked on to support more variations of the ANSI wiring methods. The only released method supported is 9S (through the TIDA-010243), but this ref design could also be used to look at 3S by just evaluating a single phase. We support different wiring methods through different, older reference designs: TIDA-010036 is dedicated 3S, TIDA-010037 is dedicated 5S; and we are working on releasing two other methods this year as well. 

      At the end of the day, this library is an example library and is intended to show the capabilities of our parts in this space, so currently we don't plan on working to support every single wiring method.

    Regards, 

    Gavin 

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