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ADS1262EVM-PDK: ADS1262EVM-PDK Operating Temperature -40'C Malfunction

user4943796
Prodigy 40 points

Part Number: ADS1262EVM-PDK

I was testing this EVM in -40'C environment.

During testing in -40'C, the EVM was not controled. 

Now, At room temperature, the EVM does not work. I guess the EVM is broken.

As shown below, this EVM is possible to operate up to -40'C .

I want to get the board repaired.

What should I do?

  • 0
    TI__Mastermind 44640 points

    Hi,

    Welcome to the TI E2E Forums!

    Unfortunately, the ADS1262EVM-PDK is not guaranteed to operate at -40C. The ADS1262 IC is specified to operate at this temperature, but other ICs on the EVM are not. However, this may or may not be the reason why the EVM is no longer working. It's also possible that at this temperature frost formed on the EVM and during defrosting some of the components were exposed to water while the EVM was powered.

    Would it be alright for me to contact you via your myTI email address with instructions regarding the EVM hardware?

  • 0 in reply to Christopher Hall
    Prodigy 40 points

    Thanks for letting me know.

    I'll repurchase this EVM and IC.

    I have some question about  supplying power measuring ADC at bottom or top voltage(0.01 or 4.99V)

    Condition : Single-ended input

    Input Voltage Range : 0 ~ 5 V

    As documented,

    PGA bypaased and analog power supply 5V(accurate), the digital and analog ground is connected together.

    When reading ADC value At 0V, I can see about 300uV ADC offset.

    Is there a way to get rid of this without calibration.

    Best regards,

    Choe

  • 0 in reply to user4943796
    TI__Mastermind 44640 points

    Hi Choe,

    The ADS1262 may have an initial offset of about "350 uV / Gain". If what you are measuring is the ADC's internal offset, then enabling CHOP mode or performing an offset calibration would be the two ways to remove this offset.

    If you are using an external signal source and programming it to 0V, you may want to try shorting the ADC input together to check if this offset is coming from the signal source or from the ADC.

    Best regards,
    Chris