Unipolar Hall Effect Sensors for Position Sensing

Unipolar Hall Effect Sensors for Position Sensing

Texas Instruments’ DRV5056 ratiometric unipolar Hall effect sensors can be used for highly accurate position sensing in a wide range of applications. They respond proportionally to the flux density of a magnetic south pole and operate from a 3.3V to 5V power supply. A unipolar magnetic response feature drives analog output of 0.6V when no magnetic field is present and increases when a south magnetic pole is applied. The output swing is further maximized with four magnetic sensitivity options of 200mV/mT, 20mT range; 100mV/mT, 39mT range; 50mV/mT, 79mT range; and 25mV/mT, 158mT range. Two package options are available, the surface mount SOT-23 and the through hole TO-92, offering different sensing directions. These devices’ ratiometric architecture minimizes errors from VCC tolerance when the external analog-to-digital converter (ADC) uses the same VCC for its reference.