The HAL^® 57x, 58x sensor family consists of different two-wire Hall switches produced in CMOS technology. All sensors change the current consumption depending on the external magnetic field and require only two wires between sensor and evaluation circuit. The sensors of this family differ in the magnetic switching behavior and switching points.

The sensors include a temperature-compensated Hall plate with active offset compensation, a comparator, and a current source. The comparator compares the actual magnetic flux through the Hall plate (Hall voltage) with the fixed reference values (switching points). Accordingly, the current source is switched on (high current consumption) or off (low current consumption).

The active offset compensation leads to constant magnetic characteristics in the full supply voltage and temperature range. In addition, the magnetic parameters are robust against mechanical stress effects.

The sensors are designed for industrial and automotive applications and operate with supply voltages from 3.75 V to 24 V in the junction temperature range from –40 °C up to 140 °C. All sensors are available in the SMD package SOT89B-1 and in the leaded versions TO92UA-1 and TO92UA-2.

System Architecture

The HAL 57x, 58x two-wire sensors are monolithic integrated circuits which switch in response to magnetic fields. If a magnetic field with flux lines perpendicular 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.

HAL 57x, 58x block diagram

Main Features

Family Overview

The types differ according to the magnetic flux density values for the magnetic switching points, the temperature behavior of the magnetic switching points.

	Feature	HAL 573	HAL 574	HAL 575	HAL 576	HAL 579	HAL 581	HAL 584
	Switching Behavior	unipolar	unipolar	latching	unipolar	latching	unipolar inverted	unipolar inverted
	Sensitivity	low	medium	medium	medium	medium	medium	medium