ALLEGRO ATS625LSG User Manual

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Package SG, 4-pin Through Hole

ATS625LSG

True Zero-Speed Low-Jitter

High Accuracy Gear Tooth Sensor

The ATS625 true zero-speed gear tooth sensor is an optimized Hall IC and magnet
configuration packaged in a molded module that provides a manufacturer-friendly
solution for digital gear tooth sensing applications. The sensor assembly consists
of an over-molded package that holds together a samarium cobalt magnet, a
pole piece concentrator, and a true zero-speed Hall IC that has been optimized
to the magnetic circuit. This small package can be easily assembled and used in
conjunction with gears of various shapes and sizes.

The sensor incorporates a dual-element Hall IC that switches in response to
differential magnetic signals created by a ferrous target. Digital processing of the
analog signal provides zero-speed performance independent of air gap as well
as dynamic adaptation of device performance to the typical operating conditions
found in automotive applications (reduced vibration sensitivity). High-resolution
peak detecting DACs are used to set the adaptive switching thresholds of the
device. Switchpoint hysteresis reduces the negative effects of any anomalies in the
magnetic signal associated with the targets used in many automotive applications.
This sensor system is optimized for crank applications that utilize targets that
possess signature regions.

1

2

3

4

1. VCC

2. VOUT

3. AUX

4. GND

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage*, VCC.......................................26.5 V

Reverse-Supply Voltage, V
Reverse-Supply Current, I
Reverse-Output Voltage, V
Continuous Output Current, I
Output Sink Current, I
Operating Temperature
Ambient, T
Maximum Junction, T
Maximum Junction ≤100 hr, T
Storage Temperature, T

*See the Power Derating section.

OUT

, Range L................–40ºC to 150ºC

A

........................–18 V

RCC

........................50 mA

RCC

.....................–0.5 V

ROUT

...................25 mA

OUT

............................. 10 mA

........................165ºC

J(max)

.................. –65ºC to 170ºC

S

J(max100)

......180ºC

TheATS625 is provided in a 4-pin SIP. The Pb (lead) free option, available by
special request, has a 100% matte tin plated leadframe.

Features and Benefits

Highly repeatable over operating temperature range
Tight timing accuracy over operating temperature range
True zero-speed operation
Air-gap–independent switchpoints
Vibration immunity
Large operating air gaps
Defined power-on state
Wide operating voltage range
Digital output representing target profile
Single-chip sensing IC for high reliability
Small mechanical size
Optimized Hall IC magnetic system
Fast start-up
AGC and reference adjust circuit
Undervoltage lockout

Use the following complete part numbers when ordering:

Part Number Pb-free Packing

ATS625LSGTN –

ATS625LSGTN-T Yes

1

Contact Allegro for additional packing options.

2

Available by special request only.

2

Tape and Reel 13-in. 800 pcs./reel

1

ATS625LSG-DS, Rev. 1

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

V+

0.1 F
C

BYPASS

VCC

ATS625LSG

True Zero-Speed Low-Jitter High Accuracy Gear Tooth Sensor

Functional Block Diagram

Voltage

Regulator

Threshold

Comparator

Threshold

Logic

Hall

Amp

Automatic

Gain

Control

PPeak

PDAC

V

PROC

NDAC

NPeak

Reference
Generator

PThresh

NThresh

GND

(Recommended)

AUX

Current

Limit

Output

Transistor

VOUT

ATS625LSG-DS, Rev. 1

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

2

ATS625LSG

True Zero-Speed Low-Jitter High Accuracy Gear Tooth Sensor

Operating Characteristics Valid at T

= –40°C to 150°C, TJ ≤ T

A

operating parameters: VCC = 12 V and TA = 25°C

Characteristic Symbol Test Conditions Min. Typ. Max. Units

ELECTRICAL CHARACTERISTICS

Supply Voltage V

Undervoltage Lockout V

Reverse Supply Current I

Supply Zener Clamp Voltage

Supply Zener Current

1

2

Supply Current I

CC

CCUV

RCC

V

Z

I

Z

CC

POWER-ON CHARACTERISTICS

Power-On State S

Power-On Time t

PO

PO

OUTPUT STAGE

Low Output Voltage V

Output Current Limit I

Output Leakage Current I

Output Rise Time t

Output Fall Time t

OUT(SAT)ISINK

OUT(LIM)VOUT

OUT(OFF)

r

f

SWITCHPOINT CHARACTERISTICS

, over full range of AG, unless otherwise noted; typical

J(max)

Operating; TJ < T

Jmax

4.0 – 24 V

– – < V

CC(min)

V

VCC = –18 V – – –10 mA

ICC = 17 mA 28 – – V

VS = 28 V – – 17 mA

Output OFF – 8.5 14 mA

Output ON – 8.5 14 mA

– High – V

Gear Speed < 100 RPM; VCC > VCC min – – 200 µs

= 20 mA, Output = ON – 200 450 mV

= 12 V, TJ < T

Output = OFF, V

Jmax

= 24 V – – 10 µA

OUT

25 45 70 mA

RL = 500 Ω, CL = 10 pF – 1.0 2 µs

RL = 500 Ω, CL = 10 pF – 0.6 2 µs

Speed S Reference target 60+2 0 – 12000 rpm

Bandwidth BW Corresponds to switching frequency – 3 dB – 20 – kHz

Operate Point B

Release Point B

% of peak-to-peak signal, AG < AG

OP

BIN transitioning from LOW to HIGH
% of peak-to-peak signal, AG < AG

RP

BIN transitioning from HIGH to LOW

max

max

;

;

–60 – %

–40 – %

CALIBRATION

Initial Calibration

3

Cal

Start-up – 1 6 edges

PO

Calibration Update Cal Running mode operation continuous –

Continued on the next page...

Allegro MicroSystems, Inc.

ATS625LSG-DS, Rev. 1

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

3

ATS625LSG

True Zero-Speed Low-Jitter High Accuracy Gear Tooth Sensor

Operating Characteristics, continued Valid at T

= –40°C to 150°C, TJ ≤ T

A

, over full range of AG, unless otherwise noted;

J(max)

typical operating parameters: VCC = 12 V and TA = 25°C

Characteristic Symbol Test Conditions Min. Typ. Max. Units

OPERATING CHARACTERISTICS with 60+2 reference target

Operational Air Gap AG

Relative Timing Accuracy, Sequen­tial Mechanical Rising Edges

Relative Timing Accuracy, Sequen­tial Mechanical Falling Edges

Relative Timing Accuracy, Signa­ture Mechanical Rising Edge

4

Relative Timing Accuracy, Signa­ture Mechanical Falling Edge

5

Relative Repeatability, Sequential
Rising and Falling Edges

Operating Signal

1

Test condition is I

2

Upper limit is I

3

Power-on speed ≤ 200 rpm. Refer to the Sensor Description section for information on start-up behavior.

4

Detection accuracy of the update algorithm for the first rising mechanical edge following a signature region can be adversely affected by the magnetic

bias of the signature region. Please consult with Allegro field applications engineering for aid with assessment of specific target geometries.

5

Detection accuracy of the update algorithm for the falling edge of the signature region is highly dependent upon specific target geometry. Please consult

with Allegro field applications engineering for aid with assessment of specific target geometries.

6

The repeatability specification is based on statistical evaluation of a sample population.

7

Peak-to-peak magnetic flux strength required at Hall elements for complying with operational characteristics.

7

CC(max)

CC(max)

6

+ 3 mA.

+ 3 mA.

ERR

ERR

ERR

ERR

T

B

Measured from sensor branded face to
target tooth

Relative to measurement taken at

RR

AG = 1.5 mm

Relative to measurement taken at

FF

AG = 1.5 mm

Relative to measurement taken at

SIGR

AG = 1.5 mm

Relative to measurement taken at

SIGF

AG = 1.5 mm

360° Repeatability, 1000 edges; peak-peak
sinusoidal signal with B

θE

PEAK

6° period

AG

IN

< AG < AG

(min)

(max)

≥ B

IN(min)

and

0.5 – 2.5 mm

– – ±0.4 deg.

– – ±0.4 deg.

– – ±0.4 deg.

– – ±1.5 deg.

– – 0.08 deg.

60 – – G

ATS625LSG-DS, Rev. 1

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

4

ATS625LSG

True Zero-Speed Low-Jitter High Accuracy Gear Tooth Sensor

Reference Target (Gear) Information

REFERENCE TARGET 60+2

Characteristics Symbol Test Conditions Typ. Units Symbol Key

Outside Diameter D

Face Width F

Circular Tooth Length t

Signature Region Cir­cular Tooth Length

Circular Valley Length t

Tooth Whole Depth h

Material Low Carbon Steel – –

t

SIG

Outside diameter of target

o

Breadth of tooth, with respect
to sensor

Length of tooth, with respect
to sensor; measured at D

Length of signature tooth,
with respect to sensor; mea­sured at D

Length of valley, with respect

v

to sensor; measured at D

t

o

Pin 4

120 mm

6mm

3mm

o

15 mm

3mm

o

3mm

Branded Face
of Sensor

t,t

Air Gap

Signature Region

SIG

Ø

D

O

V

t

F

h

t

Pin 1

Branded Face

of Sensor

Reference Target
60+2

Figure 1. Configuration with Spur Gear Reference Target

For the generation of adequate magnetic field levels, the fol­lowing recommendations should be followed in the design and
specification of targets:

• 2 mm < tooth width, t < 4 mm

• Valley width, tv > 2 mm

• Valley depth, ht > 2 mm

• Tooth thickness, F ≥ 3 mm

• Target material must be low carbon steel

ATS625LSG-DS, Rev. 1

Although these parameters apply to targets of traditional

geometry (radially oriented teeth with radial sensing, shown in

figure 1), they also can be applied in applications using stamped

targets (an aperture or rim gap punched out of the target mate-

rial) and axial sensing. For stamped geometries with axial sens-

ing, the valley depth, ht, is intrinsically infinite, so the criteria for

tooth width, t, valley width, tv, tooth material thickness, F, and

material specification need only be considered for reference. For

example, F can now be < 3 mm.

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

5

True Zero-Speed Low-Jitter High Accuracy Gear Tooth Sensor

I

Versus V

CC(ON)

14

13

12

11

10

9

8

Current (mA)

7

6

5

0 5 10 15 20 25 30

Voltage (V)

CC

ATS625LSG

Characteristic Data: Electrical

14

13

TA (°C)

-40
0

25
85

150

12

11

10

9

8

Current (mA)

7

6

5

-50 -25 0 25 50 75 100 125 150 175

I

Versus T

CC(ON)

Temperature (°C)

A

Vcc = 26.5V

Vcc = 20V

Vcc = 12V

Vcc = 4V

(V)

V

CC

26.5

20.0

12.0

4.0

I

Versus V

CC(OFF)

14

13

12

11

10

9

Current (mA)

8

7

6

5

0 5 10 15 20 25 30

CC

Voltage (V)

I

10

8

6

4

2

0

-2

Current (uA)

-4

-6

-8

-10

-50 -25 0 25 50 75 100 125 150 175

OUT(OFF)

Versus T

A

Temperature (°C)

TA (°C)

V

OUT

150

(V)

26.5

20.0

12.0

4.0

-40

I

Versus T

CC(OFF)

14

13

12

11

0

25
85

10

9

8

Current (mA)

7

6

5

-50 -25 0 25 50 75 100 125 150 175

A

Vcc = 24V

Vcc = 20V

Vcc = 12V

Vcc = 4V

VCC (V)

24.0

20.0

12.0

4.0

Temperature (°C)

V

400

350

300

250

200

150

Voltage (mV)

100

50

0

-50 -25 0 25 50 75 100 125 150 175

Temperature (°C)

OUT(SAT)

Versus T

A

I

(mA)

OUT

25
20
15
10

5

ATS625LSG-DS, Rev. 1

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

6

ATS625LSG

True Zero-Speed Low-Jitter High Accuracy Gear Tooth Sensor

Characteristic Data: Relative Timing Accuracy

Relative Timing Accuracy Versus Speed

Signature Tooth Rising Edge

0.5 mm Air Gap

1.5

1.0

0.5

0.0

-0.5

Edge Position (°)

-1.0

-1.5
500 1000 1500 2000 2500

0

Target Speed, S (rpm)

Relative Timing Accuracy Versus Speed

Signature Tooth Falling Edge

0.5 mm Air Gap

1.5

1.0

0.5

0.0

-0.5

Edge Position (°)

-1.0

-1.5
0 500 1000 1500 2000 2500

Target Speed, S (rpm)

TA (°C)

–40

150

TA (°C)

–40

150

Relative Timing Accuracy Versus Ambient

Signature Tooth Rising Edge

0.5 mm Air Gap

1.5

1.0

0.5

0

25

85

0.0

-0.5

Edge Position (°)

-1.0

-1.5

-50 0 50 100 150 200

S (rpm)

50

100

500

1000

1500

2000

Tem perature, TA (°C)

Relative Timing Accuracy Versus Ambient

Signature Tooth Falling Edge

0.5 mm Air Gap

1.5

1.0

0.5

0

25

85

0.0

-0.5

Edge Position (°)

-1.0

-1.5

-50 0 50 100 150 200

Tem perature, TA (°C)

S (rpm)

50

100

500

1000

1500

2000

Relative Timing Accuracy Versus Speed

Rising Edge Follow ing Signature Tooth

1.5

1.0

0.5

0.0

-0.5

Edge Position (°)

-1.0

-1.5
0 500 1000 1500 2000 2500

ATS625LSG-DS, Rev. 1

0.5 mm Air Gap

Target Speed, S (rpm)

TA (°C)

–40

150

Relative Timing Accuracy Versus Ambient

Rising Edge Follow ing Signature Tooth

0.5 mm Air Gap

1.5

1.0

0.5

0

25

85

0.0

-0.5

Edge Position (°)

-1.0

-1.5

-50 0 50 100 150 200

Tem perature, TA (°C)

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

S (rpm)

50

100

500

1000

1500

2000

7