This Hall effect sensor is a monolithic integrated circuit that switches in response to magnetic fields. If a magnetic field with flux lines at right angles to the sensitive area is applied to the sensor, the biased Hall plate forces a Hall voltage proportional to this field. The Hall voltage is compared with the actual threshold level in the comparator. The temperature-dependent bias increases the supply voltage of the Hall plates and adjusts the switching points to the decreasing induction of magnets at higher temperatures. 

FEATUREs:
– operates from 4.3 to 24 V supply voltage with reverse
   voltage protection
– operates with magnetic fields from DC to 20 kHz
– overvoltage and reverse-voltage protection
– on-chip temperature compensation circuitry minimizes
   shifts in on and off points and hysteresis over
   temperature and supply voltage
– the decrease of magnetic flux density caused by rising
   temperature in the sensor system is compensated by
   a built-in negative temperature coefficient of hysteresis
– ideal sensor for speed measurement, revolution
   counting, positioning, and DC brushless motors
– short-circuit protection