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ADS131M04: First data after initialization

ttd
Mastermind 8800 points
Part Number: ADS131M04


Dear Technical Support Team,

I am developing equipment incorporating the ADS131M04.
After the microcontroller boots, initialization proceeds in the following order: SPI initialization ⇒ DMA transfer initialization ⇒ ADS131M04 initialization ⇒ DMA transfer enable.
However, after initialization, the ADS131M04 outputs fixed data (3 bytes: 0x7B, 0x8D, 0x00) via SPI.

Currently, the above values are only confirmed during initialization; thereafter, they are output via DOUT in accordance with DIN.

Question:
Since no commands have been issued after initialization, is it acceptable to discard this data?

I don't believe this is noise, but I want to consider how to handle it when creating the firmware—whether it's data that should be discarded, if the data size might change, etc.

image.png

Best Regards,

ttd

  • 0
    TI__Mastermind 24105 points

    Hi TTD,

    could you explain what you are doing during the "initialization" of the ADS131M04? Are you communicating with the ADS131M04?
    The response 0x7B 0x8D 0x00 doesn't look like a valid response.
    Could you share a scope or logic analyzer screen shot for the communication, showing the CSn, SCLK, DIN, DOUT signals?

    Regards,
    Joachim Wuerker