This 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 4 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

If the magnetic field exceeds the threshold levels, the current source switches to the corresponding state. In the low current consumption state, the current source is switched off and the current consumption is caused only by the current through the Hall sensor. In the high current consumption state, the current source is switched on and the current consumption is caused by the current through the Hall sensor and the current source. The built-in hysteresis eliminates oscillation and provides switching behavior of the output signal without bouncing.

HAL 55x, HAL 56x block diagram

Main Features

Current output for two-wire applications

Junction temperature range from –40 °C up to 140 °C.

Operates from 4 V to 24 V supply voltage

Operates with static magnetic fields and dynamic magnetic fields up to 10 kHz

Switching offset compensation at typically 145 kHz

Overvoltage and reverse-voltage protection

Magnetic characteristics are robust against mechanical stress effects

Constant 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 characteristics

Ideal sensor for applications in extreme automotive and industrial environments

EMC corresponding to ISO 7637

Family Overview

	Feature	HAL 556	HAL 560	HAL 566
	Switching Behavior	unipolar	unipolar inverted	unipolar inverted
	Sensitivity	very high	low	very high