A3422EKA-T(2009) Просмотр технического описания (PDF) - Allegro MicroSystems

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A3422EKA-T
(Rev.:2009)

Hall Effect Direction Detection Sensor IC

Allegro MicroSystems 

3422

HALL-EFFECT,

DIRECTION-DETECTION

SENSOR IC

Applications Information

Operation with Fine-Pitch Ring Magnets. For

targets with a circular pitch of less than 4mm, a perfor-

mance improvement can be observed by rotating the front

face of the device (see below). This device rotation

decreases the effective element-to-element spacing,

provided that the Hall elements are not rotated beyond the

width of the target.

Applications. It is strongly recommended that an

external 0.01 µF bypass capacitor be connected (in close

proximity to the Hall elements) between the supply and

ground of the device to reduce both external noise and

noise generated by the internal logic.

The simplest form of magnet that will operate these

devices is a ring magnet. Other methods of operation,

such as linear magnets, are possible. Extensive applica-

tions information on magnets and Hall-effect devices is

also available in the “Hsall-Effect IC Applications Guide”

which can be found in the latest issue of the Allegro

MicroSystems Electronic Data Book, AMS-702 or Appli-

cation Note 27701, or at

www.allegromicro.com

0.059"

1.50 mm

A

1

2

3

4

5

α

TARGET FACE WIDTH, F

>1.50 SIN α (mm)

>0.059 SIN α (inch)

A

1

2

3

4

5

Rotated device for

fine-pitch ring

magnets

Dwg. MH-024

www.allegromicro.com

7

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