[Micronas]

Introduction

The HAL320 is a differential Hall switch produced in CMOS technology. The sensor includes 2 temperature compensated Hall plates (2.25 mm apart) with active off set compensation, a differential amplifier with a Schmitt trigger, and an open-drain output transistor (see Fig. 2).

The HAL320 is a differential sensor which 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.