ATS651LSH datasheet(4/12 Pages) ALLEGRO

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

ATS651LSH

651LSH-DS, Rev. 3

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

SWITCHING CHARACTERISTICS Valid for –40°C ≤ TA ≤ 150°C, TJ ≤ 165°C, unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Operate Point

BOP

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

AGOP < AGOP(max)

–58–

Release Point

BRP

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

AGOP < AGOP(max)

–42–

Axial/Radial Runout1

(Multiple teeth)

ROA/R

–

±1.75

Sudden Air Gap

(Single tooth)

ΔAGSAG

Instantaneous air gap change (<500 Hz)

–

±0.4

Incremental Air Gap

(Consecutive edges)

ΔAGIR+

Air gap change between edges @ >8 kHz

–

±0.1

Air gap change between edges @ 8-4 kHz

±0.15

ΔAGIR-

Air gap change between edges @ <4 kHz

–

±0.2

Vibration Immunity

(At power-on)

ROTVIBS

Rotation allowed due to vibration with temperature change

less than 10°C

–

±0.75

(°)

Vibration Immunity2

(Running)

ROTVIBR

Rotation allowed due to vibration with temperature change

less than 10°C

–

±0.35

(°)

Maximum Operating Frequency3

ffwd

Forward target rotation (pin 4 to pin 1), tLD = 38 μs

–

kHz

frev

Reverse target rotation (pin 1 to pin 4), tLD = 38 μs

–

kHz

1Inclusive of all Sudden Air Gap and Incremental Air Gap changes during operation.

2Device may output one reverse pulse at the start of vibration.

3Maximum Operating Frequency may be increased if the customer can resolve Minimum Low-State Duration levels down to the specified value.

100 %

Valley

Tooth

Forward

Reverse

B+

B–

BOP %

BOP(fwd)b

BRP(fwd)

BRP %

BOP(rev)b

BRP(rev)

Sensed Edgea

aSensed Edge: leading (rising) edge in forward rotation, trailing (falling) edge in reverse rotation

OP(fwd) triggers the output pulse during forward rotation, and BOP(rev) triggers the output pulse during reverse rotation

Device Characteristics Tables (Continued)

Continued on the next page...

ATS651LSH Switchpoints

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