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ADS8681: Regarding ADS8681 datasheet

Bruce Ryu
Prodigy 20 points

Part Number: ADS8681

Hello,

I was wondering about the "F+1" meaning at page 44.

Could you tell me about the exact meaning?

Thanks.

  • 0
    TI__Mastermind 49425 points

    Hello Bruce,

    This means you can not get the output data in the same frame as the command issued. When your command is issued in the frame F as an example, the output data can be seen in the frame (F+1) which is next frame of frame F.

    Thanks&regards,

    Dale

  • 0 in reply to Dale Li
    Prodigy 20 points

    Hello Dale,

    Thank you for your quick feedback and I understood it.

    On more questions,

    To get the ADC conversion result, I sent the command as "0x00000000".

    Is it right command?

    Another commands, I could not receive the ADC conversion result.

    Thanks.

  • 0 in reply to Bruce Ryu
    TI__Mastermind 49425 points

    Hi Bruce,

    I apologized for the delay. Any useful command to this ADC should be 32-bit, please see the table 5 in the data sheet, otherwise, the command will be considered as NOP (No operation). Can you please show me your timing plot captured with a scope(CONVST/CS, SCLK, SDO and SDI)? Did you observe any signal from RVS pin? Also, your schematic will be helpful to address the issue. 

    Thanks&regards,

    Dale

  • 0 in reply to Dale Li
    TI__Mastermind 49425 points

    Hi Bruce,

    I hope you have solved the problem since I did not receive your response after ~1 month, this thread  will be closed. Thanks.

    Best regards

    Dale