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ADS122C04: Unable to communicate

VijayaBhaskar Teki
Prodigy 60 points
Part Number: ADS122C04

HI

we are facing problem with ADS122C04 ADC. We designed hardware as per the EVM schematic, while communicate with Microcontroller STM32F746 at 100 KHz  the ADC is not responding. At ADS122C04 the DRDY is always in High state. I am attaching the schematic and timing signals

  • 0
    TI__Guru** 113765 points

    Hi VijayaBhaskar,

    Make sure your supply for AVDD and DVDD are at the nominal voltage at the pins of the ADS122C04 and make sure the RESET pin is high.

    Your communication is not proper to the device.  I cannot tell what you are trying to send, but proper communication always requires that the device address is sent as the most significant bits (device address shifted left by 1) with the least significant bit as the Read/nWrite bit.  If the correct address is being sent, the device should pull SDA low at the 9th clock indicating ACK.

    If the scope screen shot is indicating the addressing of the ADS122C04, this would be incorrect as you must shift the address left by one.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 60 points

    Dear Sir,

    Thank you for your quick response. Now my problem is solved and I am able to communicate now.

    Regards

    Vijaya Bhaskar