A19300LUBATN-RWBGA datasheet(14/17 Pages) ALLEGRO

14 / 17 page

ASIL-Compliant Hall-Effect Wheel Speed Sensor IC

with Speed and Direction Output

A19300

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

Direction Changes, Vibrations,

and Anomalous Events

During normal operation, the A19300 will be exposed to changes

in the direction of target rotation (Figure 12), vibrations of the

target (Figure 13), and anomalous events such as sudden air gap

changes.

During calibration, output pulses with direction information are

immediately transmitted to the output. Depending on target design,

air gap, and the phase of the target, direction may be momentarily

incorrect. Following a direction change in running mode, direction

changes are immediately transmitted to the output. Depending on

target design and the phase of the target, direction may be fleet-

ingly incorrect.

NormalTarget Rotation

tW(FWD)

tW(REV)

tW(FWD)

[or

]

tW(REV)

[or

]

tW(REV)

tW(FWD)

W(REV)

Target

Differential

Magnetic

Proﬁle

Vibration

[or

]

tW(REV)

[or

]

tW(FWD)

[or

]

tW(REV)

Figure 12: Direction Change Behavior

Figure 13: Vibration Behavior

tW(FWD)

Forward

Rota�on

Reverse

Rota�on

Direc�on

Change

Target Diﬀeren�al

Magne�c Proﬁle

ICC

tW(REV)

A19300LUBATN-RWBGA Datasheet(PDF) 14 Page - Allegro MicroSystems

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