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ADS131M08: ADS131 setup and communication

Saad Jabir
Prodigy 230 points
Part Number: ADS131M08
Other Parts Discussed in Thread: ADS131E08

Hello ,

I am trying to use ADS131M08 for the first time. 

Where can I find a clear description of the start-up sequence and acquisition of converted data through SPI?

The program I found on Github resets the processor continuously so I am trying to start over and build from scratch. 

Grateful for  Any indication or directions where to find the information...

  • 0
    TI__Mastermind 45685 points

    Hi Saad,

    You can check the Fast Startup Behavior section on page 32 in the data sheet. The data sheet has Code Example section on page 93 too. We also have an ADS131M0x Example C Code (SBAC254.zip). For your hardware design, you can check the schematic in the ADS131M08EVM User's Guide. These resource can be a good start for you. Let me know if you have any questions.

    BR,

    Dale

  • 0 in reply to Dale Li
    Prodigy 230 points

    Hello Dale,   Thank you for the tips .

    Before we dive in deeply ,  I need to talk to an application engineer to see if this device is suitable for our application .

    We are located in Germany

    Can you provide the details of an App. Engineer or have them call me please?

  • 0 in reply to Saad Jabir
    TI__Mastermind 45685 points

    Hi Saad,

    I would suggest you to check the ADS131M08 data sheet first. E2E forum is a good tool and community for tech communication. If you have any questions about TI's device, you can post your query here. Thank you for your understanding.

    Best regards,

    Dale

  • 0 in reply to Dale Li
    Prodigy 230 points

    Ok ,

    We would use the ADS131M08 to to make contemporary reading of weight on three scales. the three scales are connected to the same

    spi bus with different CS.

    Did you have previous similar application?

    Is there any serious obstacle which can handicap such application?  In the spec or else ?

    Do you Any information / code / app. note for tuning and using this chip for  scales?

  • 0 in reply to Saad Jabir
    TI__Mastermind 45685 points

    Hi Saad,

    Yes, this device was used by customers for such application. The following schematic shows a circuit Measuring Multiple Four-Wire Resistive Bridges in Parallel Using a Multichannel ADC With a Ratiometric Reference and a Unipolar, Low-Voltage (≤ 5 V) Excitation Source. You can see more details in the application note A Basic Guide to Bridge Measurements. I have shared the example code in the post above.

    -Dale

  • 0 in reply to Dale Li
    Prodigy 230 points

    Hi Dale, Thank you for confirming that although the chip is designed for AC power measurement , it can also be used with any bridge without problems.

    The schematic shows 5V supply to ADC . The Absolute max rating of ADS131m08 is 3.9V according to datasheet.

    -Saad

  • 0 in reply to Saad Jabir
    TI__Mastermind 45685 points

    Hi Saad,

    The app note was not developed just for ADS131M08 ADC, it can be used for any other precision ADC, e.g. ADS131E08 which can support 5V power supply. This app note focuses on design consideration and other details of bridge application but not only focuses on ADS131M08 ADC. 

    -Dale