A19302PUBATN-RPE datasheet(11/17 Pages) ALLEGRO

11 / 17 page

High-Accuracy, Pulse-Width or AK Protocol

Hall-Effect Wheel Speed and Direction Sensor IC

A19302

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

BOP

BRP

Device Orientation

to Target

Package Case Branded Face

Target Magnetic Proﬁle

–B

Mechanical Position (Target moves past device pin 1 to pin 2)

Target

(Radial Ring Magnet)

IC Internal Differential Analog Signals, BDIFF

Detected Channel Switching

Output Events

(Pin 2 Side)

(Pin 1 Side)

(Top View of

Package Case)

This pole

sensed later

This pole

sensed earlier

Channel A

Channel B

Package Case Branded Face

(Pin 2 Side)

(Pin 1 Side)

(Top View of

Package Case)

Back-Biasing Magnet

This tooth

sensed

earlier

This tooth

sensed

later

Device Orientation to Target

Mechanical Position (Target moves past device pin 1 to pin 2)

Target

(Gear)

Target Magnetic Proﬁle

South Pole

North Pole

BOP

BRP

IC Internal Differential Analog Signals, BDIFF

Detected Channel Switching

Output Events

Channel A

Channel B

Figure 10:BasicOperation

Channel A or Channel B can be used as the output switching

channel. This is determined on startup by the first channel

that switches. The non-switching channel is used for direction

detection.

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