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ADS131M02: if suitable for full bridge load cell

Damir Rashidov
Prodigy 35 points
Part Number: ADS131M02
Other Parts Discussed in Thread: ADS1235, ADS1261, , MSP430I2020

Hi,

It's not clear to me, is it possible to use this ADC on a weight scale with the full resistive bridge? If no, explain why, please. Thanks!

  • 0
    TI__Guru 66256 points

    Hello Damir,

    Thank you for your post and welcome to our forum.

    The ADS131M02 could potentially be used to measure a load cell output. However, this is not the primary target application, and we may have other devices which are better suited. Two examples would be the ADS1235 and ADS1261. These device have a flexible input multiplexor and excitation current for sensor applications.

    Regards,

    Ryan

  • 0 in reply to Ryan Andrews
    Prodigy 35 points

    Thank you Ryan,

    I asked about ADS131M02 because I'm looking for a low-cost solution. I need ADC+MCU for additional sensors and sending all the data using I2C. I found MSP microcontrollers with high precision ADC, for example, MSP430I2020. It's out of topic, is this MCU suitable to use with load cell?

  • 0 in reply to Damir Rashidov
    TI__Guru 66256 points

    Hi Damir,

    I'm not familiar with the MSP430 portfolio. It would be better to post a separate thread to their forum.

    I believe the ADS131M02 can still work for you. The gain setting can be set from 1 to 128 V/V. For gain > 4, the input impedance increases to at least 2-Mohm, which I think would be sufficient for directly connecting a load cell.

    One of the challenges that I see is how you will choose to excite the load cell. The internal full-scale range is +/- 1.2 V / Gain, so you will have to scale the excitation accordingly.

    Regards,

    Ryan