ATS651LSH datasheet(3/12 Pages) ALLEGRO

Part #	ATS651LSH

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

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Manufacturer	ALLEGRO [Allegro MicroSystems]

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

ATS651LSH

3

651LSH-DS, Rev. 3

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

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

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Supply Voltage

VCC

Running, TJ ≤ 165°C

4.3

–

24

V

Undervoltage Lockout

VCC(UV)

VCC = 5 → 0 V

–

4.3

V

Reverse Supply Current

IRCC

VCC = –18 V

–

–10

mA

Supply Zener Clamp Voltage

VZ

ICC(Low)max + 3 mA

28

–

40

V

Supply Zener Resistance

RZ

–20–

Ω

Output Current Slew Rate

SRI

I(High) → I(Low), I(Low) → I(High)

RSENSE = 100 Ω, CSENSE = 10 pF, 10 to 90% points

2

16

–

mA/

μs

Power-On State

POS

ION state

–

ICC(Low)

–mA

Power-On Time1

tPO

Gear speed < 100 rpm

–

1

ms

Supply Current

ICC(Low)

Low-current state

4

7

9

mA

ICC(High)

High-current state

12

14.5

17

mA

Supply Current Difference

ΔICC

ICC(High) - ICC(Low); difference between high-current state level

and low-current state level

5.3

–

mA

CALIBRATION

Direction Information2

NDir

First output transition

–

8

Edge

Speed Information2

NSpd

First output transition

–

8

Edge

Direction Change Detection3

NCD

Running mode direction change

–

1

Edge

Signal Variation4

(At calibration)

ECAL

Over four edges

–

±0.3

mm

DAC CHARACTERISTICS

Dynamic Offset Cancellation5

As shipped

–

±60

–

G

1Power-On Time is the time required to complete the internal automatic offset adjust; the DACs are then ready for peak acquisition.

2Edge count is based on mechanical edges. First output edge is available on or before NDir or NSpd edges.

3Edge count is based on mechanical edges. On the NCD edge, direction and speed information is valid.

4If the peak-to-peak amplitude of the signal varies more than the specified amount during the direction verification process, then additional edges may

be required for calibration.

5The device will compensate for magnetic and installation offsets up to ±60 gauss. Offsets greater than ±60 gauss may cause inaccuracies in the

output.

OPERATING CHARACTERISTICS Using Reference Target 60-0 and valid over operating temperature range

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Operational Air Gap Range*

AGOP

Within specification

0.5

–

2.8

mm

Operating Signal Range

Sig

Within specification

30

–

1200

G

*Operational Air Gap Range is dependent on the available differential magnetic field. The available field is dependent on target geometry and material,

and should be independently characterized. The field available from the Reference Target is given in the Reference Target Parameters section of this

datasheet.

Device Characteristics Tables

Continued on the next page...

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