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TMAG5273: Output resolution and data format

haras nosregor
Prodigy 50 points
Part Number: TMAG5273
Other Parts Discussed in Thread: TMAG5173-Q1

I have two questions about the TMAG5273A1 --

What is the output resolution of the CORDIC? I see it specified in the datasheet for the TMAG5173-Q1 but not this part.

How do I interpret MAGNITUDE_RESULT register?  In the data below I calculated X, Y, and Z magnetic flux densities using equation 10 from the datasheet. The MAGNITUDE_RESULT register read 0x3B (59 decimal), but sqrt(x^2 + y^2) = 37.29? 

I am using the following settings:

DEVICE_CONFIG_1 = 0x28

DEVICE_CONFIG_2 = 0x02

SENSOR_CONFIG_1 = 0x70

SENSOR_CONFIG_2 0x07

T_THR_CONFIG = 0x01

Thanks!

  • +1
    TI__Expert 8105 points

    Hi Haras,

    Thank you for posting to the Sensors forum!

    haras nosregor said:
    What is the output resolution of the CORDIC?

    The output resolution of the CORDIC is roughly ¼ of a degree.

    haras nosregor said:
    How do I interpret MAGNITUDE_RESULT register?

    The way you would convert the data from MAGNITUDE_RESULT register to mT is somewhat similar to what you would do to calculate the magnetic flux density using equation 10. Instead, you would do the following below:

    • where BMR = CH1r2 + CH2r2 
    • where CH1r = magnetic range in mT of 1st channel selected for angle calculation
    • where CH2r = magnetic range in mT of 2nd channel selected for angle calculation

    Best,

    ~Alicia