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Original question:

ADS1231: Design mistake in weight module

ADS1231: HX711 replacement

Brian Chan
Expert 8620 points

Part Number: ADS1231
Other Parts Discussed in Thread: ADS1232

Tool/software:

Hi Team

could you help me check HX711 have any suitable replacement?

HX711.pdf

BRs

Brian

  • 0
    TI__Guru 51270 points

    Hello Brian,

    ADS1231 (single channel, fixed gain=128) and ADS1232 (dual channel, selectable gains of 1,2,64, and 128) are the two most similar ADCs to the HX711.  Neither ADC is pin-2-pin equivalent.

    Regards,
    Keith Nicholas
    Precision ADC Applications

  • 0 in reply to Keith Nicholas
    TI__Expert 8620 points

    Hi Keith

    Attached is the product load cell,

    If we want to measure the weight  from 1.36KG to 11.34KG,

    and accuracy is 90g/per unit.

    Does ADS1231 and ADS 1232 meet this requirement?

    Micro load cell GML671.pdf

    BRs

    Brian

  • 0 in reply to Brian Chan
    TI__Guru 58911 points

    Hi Brian Chan,

    Keith is out of the office today due to the US national holiday, he will get back to you in the next 1-2 days. Thanks for your patience

    In the meantime, can you please help us track this opportunity by posting the customer name and project details in the Notes section of the Thread Tracking Toolkit? We will review your questions while we wait for your response

    -Bryan

  • +1 in reply to Bryan Lizon86
    TI__Guru 51270 points

    Hello Brian Chan,

    The ADS1231/ADS1232 is 4x better than the load cell for gain drift, 10x better for offset drift, and 10x better for linearity.  The measurement accuracy will depend on the actual load cell, and not the ADC.

    Based on the load cell data sheet, assuming a zero-scale before measurement to correct for any system offsets, and room temperature range of 18C to 28C, then yes, you should be able to measure weights in the range of 1.36kg to 11.34kg with an error of about +/-90g.

    Please refer to the Basic guide to Bridge Measurements application note for more details.

    https://www.ti.com/lit/an/sbaa532a/sbaa532a.pdf

    Regards,
    Keith Nicholas
    Precision ADC Applications