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ADS125H02: SPI communication issues

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Replies: 3

Views: 39

Part Number: ADS125H02

Hi team,

My customer is wanting to use ADS125H02 in their design. On their board, they are having an issue where the chip won’t respond to ANY SPI messages.  

Over  the past 3 weeks they have tried to get it it work, and could not talk to the ADS125H chip, and could not do it in a way that worked.
A:  They replaced it 3 times in case they broke the chip, and it didn’t solve the problem.
B: They rebuild a whole new PCB with a new chip, and the SPI still didn’t talk to the new prototype board.
C: They spend many days testing the pins, monitoring signals, monitoring address numbers, and it all looked great. But did not work.
D: They checked every pin on the chip, and all seemed to be driven correctly. 
E: They use the internal oscillator. They wired it correct.
F: They bought a ADS125H demo board and looked at the working SPI on the demo, and the demo worked and the SPI looked correct just like our version.

I have been given partial schematics and can send it via email. 

Thank you in advance for your support!

Errol

3 Replies

  • Hi Errol,

    We'll look into this further.  Could they share their SPI communication diagrams for us to verify?

    A few other ideas to keep them moving while we're looking into things.

    1.)  Review the ADS125H02 Example Code - it's tested and verified to work

    2.)  Try to wire the SPI signals and GND from the ADS125H02EVM over to their board. Can they talk to the part on their board w/ the EVM SPI communication? 

    Regards,
    Collin Wells
    Precision ADC Applications

  • In reply to Collin Wells:

    Hi Colin,

    Thank you for the quick response!  I will follow-up to get SPI communication diagrams and have the customer implement the 2 ideas in parallel.

    Thank you!

    Errol

  • In reply to Errol Leon6:

    Hi Errol,

    Once you have a feedback from the customer, please let us know, thanks.

    Best regards,

    Dale

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