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ADS131M08: SPI Reset Command dont't work

Markus Hillebrand
Prodigy 20 points
Part Number: ADS131M08


Tool/software:

Hello,

I'm trying to send a reset command via SPI, but the device doesn't respond as expected. According to the specification, when the reset command 0x11 is executed successfully, the device should respond with 0xFF28. However, it currently replies with 0x11, indicating that the reset was not executed.

Where does the timing parameter tREGACQ come into play in this context?

Greetings and thanks

Markus

  • +1
    TI__Mastermind 46055 points

    Hi Markus Hillebrand,

    A whole frame on ADS131M08 requires 10 words&24-bit per word including the command/STATUS+8-ch data+CRC, you are sending 4 words, just send 10 words and check the first word in the next frame again.

    -Dale

  • +1 in reply to Dale Li
    Prodigy 20 points

    many THANKS! It works, but I can't find where it says this in the datasheet or am I too blind?

    greetings

    Markus

  • 0 in reply to Markus Hillebrand
    TI__Mastermind 23685 points

    Hi Markus,

    I am helping out while Dale is out of office today.

    You can find some information about that in the "8.4.1.3 RESET Command" section in the datasheet.
    The RESET command occurs in the first word of the data frame, but the command is not latched by the device until the entire frame is complete. Terminating the frame early causes the RESET command to be ignored. Ten words are required to complete a frame on the ADS131M08.

    For other commands than the RESET command you can in principle "short-cycle" the SPI frame if desired.

    Regards,
    Joachim Würker