SLIA086A June   2014  – December 2021 DRV5013 , DRV5013-Q1 , DRV5023 , DRV5023-Q1 , DRV5033 , DRV5033-Q1 , DRV5053 , DRV5053-Q1

 

  1.   Trademarks
  2. 1Units
  3. 2Practical Concepts
  4. 3Polarity
  5. 4Digital Hall Sensor Functionality
    1. 4.1 Design Example with Digital Hall Sensors
  6. 5Linear Hall Sensor Functionality
    1. 5.1 Linearity
    2. 5.2 Noise
    3. 5.3 Magnetic Flux Density Calculator
    4. 5.4 Design Example with Analog Hall Sensors
  7. 6Information on Additional Data Sheet Specifications
  8. 7Revision History

4 Digital Hall Sensor Functionality

Digital Hall sensors either have an open-drain or push-pull output that pulls low if B exceeds the threshold BOP (the operate point). The output then stays low until B decreases below the threshold BRP (the release point), then the output becomes High-Impedance for an open-drain output and pulled high for a push-pull output. BOP and BRP are always separated with hysteresis (Bhys), which prevents noise-induced toggling at a threshold. Omnipolar devices have an output that reacts to positive and negative fields the same while unipolar devices have an output that reacts to either a positive field or a negative field only.

GUID-1F100557-4C1C-45A2-BCB1-CFB4A267FE86-low.gifFigure 4-1 B-field Response of the DRV5032 Omnipolar Device Variants

Like all data sheet parameters, the actual B thresholds vary due to semiconductor process variation, operating voltage, and temperature.

Table 4-1 B Thresholds for DRV5032AJ
PARAMETER MIN TYP MAX UNIT
BOP Operate point ±4 ±7 ±9.4 mT
BRP Operate point ±3 ±5.6

±7.5
Bhys Hysteresis; Bhys = (BOP – BRP) 0.5 1.4 3

A magnet and Hall sensor should be selected so that the field at the sensor exceeds the specified max-BOP, to guarantee that the magnetic threshold is crossed.