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Original question:

ADS1258: Way to poll the ADC channels

ADS1258: Configuration Register 0 will change to 0x00 after it has been running for anywhere from 15 minutes to 2 hours.

Matthew Cole
Prodigy 20 points
Part Number: ADS1258

I have configuration register 0 set to 0x12 at power up. But for some reason after 15 minutes to 2 hours when I read configuration register 0 it will say it is set to 0. Do you know what would cause the configuration register 0 to change to 0?

  • 0
    TI__Guru 52576 points

    Hi Matthew Cole,

    The default value of the CONFIG0 register is 0x0A, so I am not sure what would set the register to a different, non-default value. Is there any traffic on the SPI lines that could cause an inadvertent WREG?

    You have confirmed that the initial register write occurs as intended, correct? In other words, you are able to read back a value of 0x12 after the initial WREG and it is only after some time that you try to read back the register again and you get 0x00?

    Are there any issues with the ADC clock or power supplies during this time? 

    -Bryan

  • 0 in reply to Bryan Lizon86
    Prodigy 20 points

    For testing i have my code read registers 0 - 5 every minute. After about 15 minutes to 2 hours the register gets set to 0x00

  • 0 in reply to Matthew Cole
    TI__Guru 52576 points

    Hi Matthew Cole,

    Can you monitor the SPI lines for any additional traffic that could cause such an issue?

    Are there any issues with the ADC clock or power supplies during this time?

    -Bryan

  • 0 in reply to Bryan Lizon86
    Prodigy 20 points

    It can take up to 2 hours for the issue to happen and I don't have a way to log SPI data. I am sending a 16 read commands every 50 milliseconds 

  • 0 in reply to Matthew Cole
    TI__Guru 52576 points

    Hi Matthew Cole,

    If you are unable to determine the state of the SPI, the supplies, or the clock when the issue occurs, I am not sure what additional help we can offer.

    There is no obvious reason why this issue should occur, especially since it happens repeatedly and is not returning to the default register value.

    -Bryan