The HAL® 320 from Micronas is a differential Hall switch produced in CMOS technology. The sensor includes two temperature-compensated Hall plates (2.25 mm apart) with active offset compensation, a differential amplifier with a Schmitt trigger, and an open-drain output transistor.
The HAL 320 Differential Sensor responds to spatial differences of the magnetic field. The Hall voltages at the two Hall plates, S1 and S2, are amplified with a differential amplifier. The differential signal is compared with the actual switching level of the internal Schmitt trigger. Accordingly, the output transistor is switched on or off. The sensor has a bipolar switching behavior and requires positive and negative values of B = BS1 - BS2 for correct operation.
The sensor is designed for industrial and automotive applications and operates with supply voltages from 4.5 V to 24 V in the ambient temperature range from –40 °C up to 150 °C. The HAL 320 is an ideal sensor for target wheel applications, ignition timing, anti-lock brake systems, and revolution counting in extreme automotive and industrial environments.
The HAL 320 is available in the SMD-package SOT89B-2 and in the leaded versions TO92UA-3 and TO92UA-4.
