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IWRL6432BOOST: SPI vs DCA1000EVM: ADC Data Logging Limitations and Frame Size Constraints

Shambhavi V
Prodigy 40 points
Part Number: IWRL6432BOOST
Other Parts Discussed in Thread: DCA1000EVM

Tool/software:

Hello,

I am working with the xWRL6432 radar and evaluating different ADC data logging methods. I'd like to clarify these questions

I referred the schematic diagram and understood that the data for ADC logging over SPI interface and DCA1000evm is same. Is my understanding correct that the raw ADC data outputs are identical when logged via SPI and DCA1000EVM?

I’ve read that SPI logging has a 96 kB data size per frame limit. What is the reason for this size limit?

Does DCA1000EVM logging have any similar data size or throughput limitations for this board?

Are there any other differences or limitation to be considered while evaluating these approaches.

Thanks.

Regards,

Shambhavi

  • 0
    TI__Mastermind 19450 points

    Hello Shambhavi.

    Shambhavi V said:

    I’ve read that SPI logging has a 96 kB data size per frame limit. What is the reason for this size limit?

    Does DCA1000EVM logging have any similar data size or throughput limitations for this board?

    The SPI logging has a 96 kB data size per frame limit to avoid any data loss while transmitting over SPI.  However, the DCA1000 doesn't have this limitation since data is transferred over ethernet.

    Sincerely,

    Santosh

  • 0 in reply to Santosh Krishnan
    Prodigy 40 points

    Thanks, Santosh, for clarifying that.

    Essentially the data sent via DCA1000EVM and though SPI interface would be same for xWRL6432 boards right?

  • +1 in reply to Shambhavi V
    TI__Mastermind 23017 points

    Hello,

    Raw data will be the same that is correct. It is the I/Q data from the ADC captured from the sensor's front end. DCA1000 and SPI interfaces are simply means of capturing this data. The challenge tends to be transfer bandwidth, due to mmwave data being sent at high speeds in the micro seconds domain.

    Best Regards,

    Pedrhom