The HAL 710/730 Hall switch family is produced in CMOS technology. The sensors include two independent temperature-compensated Hall plates each equipped with active offset compensation and a comparator. The sensors provide two open-drain outputs – one for “count” and one for “direction” detection.

The comparator compares the actual magnetic flux through the Hall plates (Hall voltage) with the fixed reference values (switching points). The first comparator directly switches the count output. The phase shift between both comparators determine the state of the direction output.

The active offset compensation leads to magnetic parameters which are robust against mechanical stress effects. In addition, the magnetic characteristics are constant over the full supply voltage and temperature 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 710/730 family is available in the SMD package SOT-89B-3.

System Architecture

The Hall-effect sensor is a monolithic integrated circuit that switches 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. If the magnetic field exceeds the threshold levels, the open-drain output switches to the appropriate state. The built-in hysteresis eliminates oscillation and provides switching behavior of output without bouncing.

Magnetic offset caused by mechanical stress is compensated for by using the “switching offset compensation technique”. Therefore, an internal oscillator provides a two phase clock. The Hall voltage is sampled at the end of the first phase. At the end of the second phase, both sampled and actual Hall voltages are averaged and compared with the actual switching point.

Block diagram of the HAL 710/730

Main Features

Major Applications

Available Types and Switching Behavior

	Type	Direction Output: Definition of Output State
	HAL 710	Output high, when edge of comparator 1 precedes edge of comparator 2
	HAL 730	Output high, when edge of comparator 2 precedes edge of comparator 1