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ADS124S06: DRDY signal issues

Adrian Ymeraj
Expert 3810 points
Part Number: ADS124S06

Dear team,

my customer has been evaluating the ADS124S06 for a while but now they found and issue when writing a register of the converter. Each time they write the register, the DRDY signal moves unexpectedly. Is this a proven behavior of the device? Have you ever seen this behavior before?

Thanks and best regards,

Adrian

  • 0
    TI__Guru**** 180931 points
    Hi Adrian,

    Can you please provide a little more detail here? There are 17 different registers in the ADS124S06, which register(s) are being written to, and what values are being written?
  • 0 in reply to Tom Hendrick
    TI__Guru* 97585 points
    Adrian,


    Writing to specific register in the ADS124S06 will cause the converter to immediately set the new configuration and start a new conversion. These registers include:
    • Channel configuration register (02h)
    • Gain setting register (03h)
    • Data rate register (04h)
    • Reference control register (05h), bits [5:0]
    • Excitation current register 1 (06h), bits [3:0]
    • Excitation current register 2 (07h)
    • System control register (09h), bits [7:5]

    This is detailed in the datasheet on page 68. There's a bit more information on the nature of the WREG and restart of the digital filter.


    Joseph Wu
  • 0 in reply to Joseph Wu
    TI__Guru** 113765 points
    Hi Adrian,

    Just one other thing to add to Joseph's comments. The first SCLK will reset the DRDY high (if it is low) for any communication regardless if the command is for a register write (WREG). This behavior can be observed when clocking out the data in direct data read mode. See figure 90 on page 69 of the ADS124S06 datasheet. So to answer the original question, yes this is expected behavior.

    If one of the registers, mentioned by Joseph, is changed the conversion will restart once the command has been issued. DRDY will transition from high to low to signal when new conversion results are ready.

    Best regards,
    Bob B
  • 0 in reply to Bob Benjamin
    TI__Expert 3810 points
    Thank you all for the great inputs!
    Problem solved!

    Cheers,
    AY