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TMAG5170: Temperature compensation of TMAG5170

Kevin Huang8
Genius 3805 points
Part Number: TMAG5170

Tool/software:

Hi Team,

Customer designed TMAG5170 position sensing, TMAG5170 is placed outside the tube,

and the magnet device is designed inside the tube. The temperature inside the tube will change (0~ +38 C) due to long-term operation (compression/release);

Can TMAG517 be compensated? Or can it only be compensated based on the ambient temperature where TMAG5170 is located?

In addition, what should we pay attention to when selecting magnets? Due to the variation in the manufacturing process of each magnet, do we need to perform individual calibration on each magnet?

  • 0
    TI__Genius 17420 points

    Kevin,

    The internal temperature compensation for TMAG5170 is configured assuming that the magnet and sensor are at the same relative temperature.  Magnets will derate their strength as temperature increases, and there are typical values for each magnetic material.  For instance NdFeB type magnets the change in the remanence (Br) is typically -0.12%/C.  TMAG5170 can be set to increase the gain by +0.12%/C to counter this, but it requires the internal temperature sensor to measure the same relative temperature as the magnet.

    A customer could implement a manual temperature compensation if they had a method to measure the temperature of the magnet and then to use that data to scale the output result from the device. It would likely be alright to use a single derating value based on the material spec from the magnet supplier.

    Thanks,

    Scott