The HAL® 710 and the HAL® 730 are monolithic integrated Hall-effect sensors manufactured in CMOS technology with two independent Hall plates S1 and S2 spaced 2.35 mm apart. The devices have two open-drain outputs. The Count Output operates like a single latched Hall switch according to the magnetic field present at Hall plate S1, while the Direction Output indicates the direction of a linear or rotating movement of magnetic objects. In combination with an active target providing a sequence of alternating magnetic north and south poles, the sensors generate the signals required to control position, speed, and direction of the target movement. The internal circuitry evaluates the direction of the movement and updates the Direction Output at every edge of the Count Signal (rising and falling). The state of the Direction Output only changes at a rising or falling edge of the Count Output. The design ensures a setup time for the Direction Output with respect to the corresponding Count Signal edge of 1/2 clock periods (1 µs minimum).
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. This is required by systems determining the direction from the comparison of two signals.
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.