SLYA058A June   2022  – September 2024 DRV5021 , DRV5032 , DRV5033 , TMAG5123 , TMAG5124 , TMAG5170 , TMAG5233 , TMAG5273 , TMAG5328

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Hall-Effect Sensors in Smart Locks
    1. 1.1 Tamper Detection
  5. 2Methods for Hall-Effect Based Rotational Position Sensing
    1. 2.1 Switch Implementation
    2. 2.2 Rotational Sensing With 3D Hall-Effect Sensors
  6. 3Summary
  7. 4References
  8. 5Revision History

3 Summary

Using Hall-effect sensors to determine the position of a deadbolt in an electronic smart lock can be done in two main ways. A switched implementation provides a lower power consumption per device while the 3D Hall sensor provides additional information on the position of the deadbolt. The tolerances of the design can also be varied as needed by selecting different magnets or sensors.

Table 3-1 Recommended Devices
Device Characteristics Design Considerations
DRV5032 Ultra-low-power digital switch Hall-effect sensor available in SOT-23, X2SON, and TO-92 packages. Both omnipolar and unipolar options available. Great for low power applications. This device can operate on as little as 1.65V with typical current consumption below 1uA. DU and FD variants in X2SON have dual unipolar functionality.
TMAG5233 In-plane Hall-effect switch (vertical sensor) available in industry-standard SOT-23 package. Has an omnipolar magnetic response that reacts to both north and south magnetic poles parallel to the package marking surface.
TMAG5170 High-precision linear 3D Hall-effect position sensor available in SOT-23, X2SON, and TO-92 packages. Both omnipolar and unipolar options available. Measures magnetic field strength on all 3 axes and reports data over SPI. This device offers high precision and self-diagnostic features beneficial for system monitoring.
TMAG5273 Low power linear 3D Hall-effect position sensor with I2C interface available in 6 pin SOT-23 package. Measures magnetic field strength on all 3 axes and reports data over I2C interface. This device can operate on as little as 1.7V. Configurable power mode options allow for system performance and current consumption optimization.
TMAG3001 Lower power linear 3D linear and angle Hall-effect sensor with I2C interface and wake up detection in YBG package. Measures magnetic field on X, Y, and Z axes and reports data over I2C interface. Great for low power applications. This device can operate on as little as 1.65V. Configurable power mode options allow for system performance and current consumption optimization.