HAL114

operates from 4.5 V to 24 V supply voltage
overvoltage protection
reverse-voltage protection at V_DD-pin
short-circuit protected open-drain output by thermal shutdown
operates with magnetic fields from DC to 20 kHz
stable magnetic switching points over a wide supply voltage range
the decrease of magnetic flux density caused by rising temperature in the sensor system is compensated by a built-in negative temperature coefficient of the magnetic switching points
ideal sensor for contactless switches and speed measurement in hostile automotive and industrial environments

The HAL114 is a CMOS integrated circuit with a switching output in response to magnetic fields. HAL114 processes the "Hall Voltage" internally: The Hall Voltage is proportional to the magnetic flux component Bz orthogonal to an integrated Hall Plate, in case an electric current is imposed to the plate. The HAL114 compares the Hall Voltage with a predefined threshold and generates the output signal dependent of the direction of the magnetic field. A special circuit compensates for the temperature dependent effects of the IC, as well as the external magnet.A built-in hysteresis eliminates possible oscillations of the output signal adjacent to its switching point so that "output bouncing" is avoided. The output is short-circuit protected by limiting high currents and by sensing excess temperature. Shunt protection devices clamp voltage peaks at the Output-Pin and V_DD-Pin together with external series resistors. Reverse current is limited at the VDD-Pin by an internal series resistor up to 15 V.No external reverse protection diode is needed at the V_DD-Pin for values ranging from 0 V to 15 V.