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ADS8684A: In idle mode

Zoe Ko
Expert 3820 points
Part Number: ADS8684A

Hi team,

For the ADS8684A, we know after power up, the ADS8684A is placed into idle mode and does not perform any function until it receives command.

And we are curious that if we power up and not giving any command to the device, it keep polling and output repeat showing below.

Is it normally?

0xC0000000 (C0000000h)

0XC4000000 (C4000000h)

0xC8000000 (C8000000h)

0xCC000000 (CC000000h)

Thank you!

  • 0
    TI__Mastermind 45715 points

    Hi Zoe,

    During power-up or reset, the default content of the command register is all 0's(NO_OP),the different program registers in the device wake up with their default values and the device waits for a command to be written before being placed into any mode of operation. NO_OP command is a continue operation in previous mode. Also, when you get data on SDO line, you will have to select the ADC by pulling /CS low which is used to initiate a conversion too. However, for any condition, you should not see any code on SDO with first 16 SCLKs but you saw them, this is not expected and something should be wrong. Can you please capture a timing plot with /CS,SCLK, SDI and SDO in one or two particular frames? thanks.

    Regards,

    Dale