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TMAG5170-Q1: Magnetic Stray Field immunity

Part Number: TMAG5170-Q1
Other Parts Discussed in Thread: TMAG5170

Does the TMAG5170-Q1 sensor provide an immunity against external magnetic stray fields of 4kA/m according ISO 11452-8?

The sensor is intended for an on-axis measurement of an diametrically magnetised magnet with a flux density of approx. 30 mT at the position of the sensor.

  • Florian,

    This device will detect the absolute magnetic fields present at the sensor location, regardless of the source.  Stray fields which are present may impact the desired magnetic input field if strong enough to influence the source magnet, and this may cause deviations from the expected system behavior. The strength of the stray field will depend on the proximity to the source.

    Most Hall-effect sensors are only sensitive to a single component of the magnetic B-field.  As a result it is very difficult to detect erroneous inputs from stray fields.  TMAG5170 has a few features which are useful to this purpose, however.  Firstly, as a 3D Hall-effect sensor, it is able to monitor all three axes.  It is possible then to better predict erroneous inputs by looking for unusual behavior with the additional field information.  For example, if the system is setup such that the magnetic field will be primarily directed in the XY plane, with little to no Z component, then any significant signal observed on the Z output would indicate a stray field event.  The device additionally offers programmable thresholds which may be used to trigger an ALERT signal for interrupt control.  With this feature enabled, an SPI read would not be necessary to alert the MCU of the stray field event.  

    Thanks,

    Scott