2D Speed and Direction Sensor IC


 Allegro MicroSystems, LLC announced the availability of a unique dual-channel Hall-effect latch featuring two-dimensional (2D) sensing via a combination of vertical Hall and planar Hall elements. The quadrature outputs of the A1262 allow rotation direction and position to be determined, such as when sensing a rotating ring-magnet target. The unique 2D operation of the combined planar and vertical Hall elements allows the end user to achieve an ideal 90° of phase separation between channels that is inherently independent of ring magnet geometry (pole pitch). This enables system designers to achieve new mechanical configurations not feasible with traditional planar Hall sensors, including replacing through-hole SIP devices with tiny surface-mount SOT23 ICs, saving space and cost. This new device is targeted at applications in the automotive, industrial, and consumer markets such as motor commutation and rotary position sensing, e.g., window blinds, garage door openers, scroll wheels, power window lifts, sunroof/sliding door/trunk/tailgate motors, white goods, etc.
 
Allegro’s A1262 is available in two options that allow flexibility in end-system magnetic design. Both options feature a planar Hall element that is sensitive to magnetic fields perpendicular to the face of the package (Z). The other channel comes from a vertical Hall element that is sensitive in either the X or Y direction. The Y option features a vertical Hall plate that is sensitive to magnetic fields parallel with the face of the package across the leaded edges of the package. The X option features a vertical Hall plate that is sensitive to magnetic fields parallel with the face of the package across the leadless edges of the package, resulting in lower total effective air gap than can be achieved with competing solutions.
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