High-Accuracy, Pulse-Width or AK Protocol

Hall-Effect Wheel Speed and Direction Sensor IC

A19302

17

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

Revision History

Number

Date

Description

–

February 24, 2020

Initial release

1

April 9, 2020

Updated Selection Guide

2

May 21, 2020

Updated ASIL assessment status (pages 1-2), Operating Differential Magnetic Input test conditions

(page 4), ASIL Fault Pulse Width characteristic name (page 5), and Footnote 6 (page 6).

3

September 18, 2020

Updated ASIL status (pages 1-2) and other minor editorial updates.

4

October 14, 2020

Added Description of AK Protocol (page 10).

5

December 9, 2021

Updated Figure 9 (page 9) and Bit 4 Coding (page 10).

For the latest version of this document, visit our website:

www.allegromicro.com

Copyright 2021, Allegro MicroSystems.

Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit

improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the

information being relied upon is current.

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of

Allegro’s product can reasonably be expected to cause bodily harm.

The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor

for any infringement of patents or other rights of third parties which may result from its use.

Copies of this document are considered uncontrolled documents.