Hall-Effect Unipolar Switches

Hall-effect switches are most commonly used in sensing absolute position, because they require a south pole of sufficient strength to turn the output on and then removal of that field to turn the output off. These contactless sensing solutions require few external components and can withstand the hostile operating conditions of automotive applications. Typical applications include: shift selectors, wiper end/home position, door ajar/open, and vane-interrupt systems. Allegro also offers a wide selection of two-wire devices, which are often used in safety critical applications, such as seat belt buckle and seat position sensing.

Specific advantages of Allegro’s solutions include:

• 4× chopper-stabilization for offset cancellation provides: enhanced switch point stability that increases accuracy in measuring motor speed or duty cycle, and industry leading jitter performance that is twice as better than competitor devices
• Low voltage (3 V) operation and lower ICC for more power efficient devices
• Designed to survive harsh automotive environments

Allegro has a broad range of devices sensitivities that cover just about any application requirement.