Hall-effect Sensor With Direction Detection

The HAL710 is a monolithic integrated Hall-effect sen- sor manufactured in CMOS technology with two inde- pendent Hall plates S1 and S2 spaced 2.35 mm apart. The device has two open-drain outputs: The Count Output operates like a single latched Hall Switch according to the magnetic field present at Hall plate S1 (see Fig. 33). 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 Sensor forms a system generating the sig- nals 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 Direction Output is high if the target moves from Hall plate S1 to Hall plate S2. It is low if the target first passes plate S2 and later plate S1. The state of the Direction Output only changes at a rising or falling edge of the Count Output. By Unkown
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