Introduction
The HAL411 is a Linear Hall Effect Sensor produced in CMOS technology. The sensor includes a temperature compensated Hall plate with choppered offset compensation, two linear output stages, and protection devices (see Fig. 2–1).
The output voltage is proportional to the magnetic flux density through the hall plate. The choppered offset compensation leads to stable magnetic characteristics over supply voltage and temperature.
The HAL411 can be used for magnetic field measurements, current measurements, and detection of any mechanical movement. Very accurate angle measurements or distance measurements can also be done. The sensor is very robust and can be used in electrically and mechanically hostile environments.
The sensor is designed for industrial and automotive applications and operates in the ambient temperature range from –40 °C up to 100 °C and is available in the SMD-package SOT-89B.

FEATUREs:
– switching offset compensation at 147 kHz
– low magnetic offset
– extremely sensitive
– operates from 4.9 to 5.1 V supply voltage
– overvoltage protection
– reverse voltage protection of VDD-pin
– differential output
– accurate absolute measurements of DC and low 
   frequency magnetic fields
– on-chip temperature compensation
– low 1/f-noise