The HAL^® 700 and the HAL^® 740 are monolithic CMOS Hall-effect sensors consisting of two independent switches controlling two independent open-drain outputs. The Hall plates of the two switches are spaced 2.35 mm apart.

The devices include temperature compensation and active offset compensation. These features provide excellent stability and matching of the switching points in the presence of mechanical stress over the whole temperature and supply voltage range.

The sensors are designed for industrial and automotive applications and operate with supply voltages from 3.8 V to 24 V in the ambient temperature range from -40 °C up to 125 °C.

The HAL 700 and the HAL 740 are available in the SMD-package SOT89B-2.

System Architecture

The HAL 700 and the HAL 740 are monolithic integrated circuits with two independent subblocks each consisting of a Hall plate and the corresponding comparator. Each subblock independently switches the comparator output in response to the magnetic field at the location of the corresponding sensitive area. If a magnetic field with flux lines perpendicular to the sensitive area is present, the biased Hall plate generates a Hall voltage proportional to this field. The Hall voltage is compared with the actual threshold level in the comparator. The subblocks are designed to have closely matched switching points. The output of comparator 1 attached to S₁ controls the open drain output at Pin 3. Pin 2 is set according to the state of comparator 2 connected to S₂.

HAL 700 and HAL 740 block diagram

Main Features

Family Overview

The types differ according to the switching behavior of the magnetic switching points at the both Hall plates S₁ and S₂.

	Feature	HAL 700	HAL 740
	Switching Behavior	S1: latching S2: latching	S1: unipolar north sensitive S2: unipolar south sensitive