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TMAG5273: Sensor accuracy

fujiitk
Prodigy 40 points
Part Number: TMAG5273

Hello,

I would like to calculate the measurement error of TMAG5273.

My application is to measure the angle of rotation of an axis, should I only consider ±0.5°(CONV_AVG = 101, TA =25C) as stated in the datasheet?

I am planning to use the results of CORDIC calculations for the angles.

  • 0
    TI__Expert 7830 points

    Hi, 

    Thank you for posting your question to E2E.

    The accuracy you will see will ultimately depend on the entire system, which includes the magnet, the distance from the magnet to the sensor, mechanical tolerances, and other factors. Our TI Magnetic Sense Simulator (TIMSS) can be used to determine the field that will be observed by our devices based on your system's parameters.

    https://webench.ti.com/timss/ 

    Section 8.1.6 of the TMAG5273 datasheet provides a description of potential error sources and a tool for estimating the total error during angular measurement. The tool is linked here: https://www.ti.com/lit/zip/sbar012 

    Best regards,

    Jesse

  • 0
    Prodigy 40 points

    Hi,

    Thank you for the calculation tool.I will use it.

    What is the difference between SENSER_PC_25C_A1 and SENSMS_XY_A1 in the data sheet?
    Does it mean that SENSER_PC_25C_A1 can be in error to the maximum in each axis?
    For example, does this mean that if the X-axis has a deviation of +20%, the Y-axis could have a deviation of -20%?

    If so, how should the 0.5% in SENSMS_XY_A1 be considered?

  • 0 in reply to fujiitk
    TI__Expert 7830 points

    SENSER_PC_25C_A1 is specifically referring to the sensitivity error of the individual X, Y, or Z axis from the selected magnetic range setting.

    SENSMS_XY_A1 specifically refers to the sensitivity mismatch between the X and Y axis. Essentially this additional spec shows that although the sensitivities of the two individual axes can vary according to the sensitivity error spec, they vary together according to the sensitivity mismatch spec.

    Best regards,

    Jesse