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ADS122U04: About communication

Part Number: ADS122U04
Other Parts Discussed in Thread: TIDA-01526,

Hello, team Ti
I downloaded the data about tida-01526 on the official website and made the development board. Now I use ttl-232r-3v3 cable to set the register of ads122u04. I find the problem. I can observe the data sent by the PC with the oscilloscope, but the ads122u04 chip does not respond. I can't find the reason. Please help me to analyze it. R21, R22, R15, R16 are not welded on my circuit board
Thank you, looking forward to your reply!

  • Hi User5877261,

    You must make sure that the ADS122U04 is properly powered at the device and that the RESET pin is set high.  Note in the schematic that R24 should be installed, but R23 should not be installed or the reset pin will be held low and held in a reset condition.  I would suggest reviewing the schematic on TIDA-01526 that is separate from the actual design files as this schematic variant shows the devices that should not be installed (DNP).

    I would also verify that other jumper settings (J1, J2 and J3) are set so that the ADS122U04 is properly powered.

    Best regards,

    Bob B

  • Hi 

        Hello, thank you for your quick reply. I found the schematic diagram you said and removed R23. At this time, ads122u04 communication is normal and the reading and writing register values are completely correct. I used pt1000rtd, R13 selects 3900 ohms. Now the problem is that the ad value I collected is not converted to the temperature value correctly. My room temperature is about 20 degrees Celsius, and the ad value I collected is 447659. After interpolation conversion, the temperature is a very outrageous data. The value I set in my register is register 0 (61H), register 1 (0ah), register 2 (03h), register 3 (a1h), Please help me to analyze what's wrong?

        thank you very much!