4

651LSH-DS

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

Two-Wire Self-Calibrating Differential Speed and Direction Sensor with Vibration Immunity

ATS651LSH

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Operate Point

% of peak-to-peak referenced from PDAC to NDAC,

–58–

%

Release Point

% of peak-to-peak referenced from PDAC to NDAC,

–42–

%

(Multiple teeth)

–

–

±1.75

mm

Sudden Air Gap

(Single tooth)

Instantaneous air gap change (<500 Hz)

–

–

±0.4

mm

Incremental Air Gap

(Consecutive edges)

Air gap change between edges @ >8 kHz

–

–

±0.1

mm

Air gap change between edges @ 8-4 kHz

±0.15

mm

Air gap change between edges @ <4 kHz

–

–

±0.2

mm

Vibration Immunity

(At power-on)

Rotation allowed due to vibration with temperature change

less than 10°C

–

–

±0.75

(°)

(Running)

Rotation allowed due to vibration with temperature change

less than 10°C

–

–

±0.35

(°)

6

–

–

kHz

12

–

–

kHz

ATS651LSH Switchpoints

100 %

Valley

Tooth

B+

B–

t

Device Characteristics Tables (Continued)

Continued on the next page...