ALLEGRO ATS616LSG User Manual

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Dynamic Self-Calibrating Peak-Detecting Differential

Package SG, 4-pin SIP

1

2

3

4

1. VCC

2. VOUT

3. Test Pin (Tie to GND)

4. GND

ATS616LSG

Hall Effect Gear Tooth Sensor

The ATS616 gear-tooth sensor is a peak-detecting device that uses automatic gain
control and an integrated capacitor to provide extremely accurate gear edge detec­tion down to low operating speeds. Each sensor module consists of a high-tem­perature plastic shell that holds together a samarium-cobalt magnet, a pole piece,
and a differential open-collector Hall IC that has been optimized to the magnetic
circuit. This small package can be easily assembled and used in conjunction with a
wide variety of gear shapes and sizes.

The gear-sensing technology used for this sensor module is Hall-effect based. The
sensor incorporates a dual-element Hall IC that switches in response to differential
magnetic signals created by ferrous targets. The sophisticated processing circuitry
contains an A-to-D converter that self-calibrates (normalizes) the internal gain
of the device to minimize the effect of air-gap variations. The patented peak­detecting filter circuit eliminates magnet and system offsets and has the ability to
discriminate relatively fast changes such as those caused by tilt, gear wobble, and
eccentricities. This easy-to-integrate solution provides first-tooth detection and
stable operation to extremely low rpm. The ATS616 can be used as a replacement
for the ATS612LSB, eliminating the external peak-holding capacitor needed by
the ATS612LSB.

The ATS616 is ideal for use in systems that gather speed, position, and timing
information using gear-tooth-based configurations. This device is particularly
suited to those applications that require extremely accurate duty cycle control or
accurate edge-detection, such as automotive camshaft sensing.

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, V
Reverse-Supply Voltage, V
Output Off Voltage, V
Continuous Output Current, I
Reverse-Output Current, I
Operating Temperature
Ambient, T
Maximum Junction, T
Storage Temperature, T

*See Power Derating section.

ATS616LSG-DS, Rev. 1

.....................................26.5 V*

CC

OUTOFF

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

A

........................–18 V

RCC

............................ 24 V

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

OUT

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

ROUT

........................165ºC

J(max)

.................. –65ºC to 170ºC

S

TheATS616 is provided in a 4-pin SIP that is Pb (lead) free, with a 100% matte
tin plated leadframe.

Features and Benefits

• Self-calibrating for tight timing accuracy

• First-tooth detection

• Immunity to air gap variation and system offsets

• Eliminates effects of signature tooth offsets

• Integrated capacitor provides analog peak and valley information

• Extremely low timing-accuracy drift with temperature changes

• Large air gap capability

• Small, integrated package

• Optimized magnetic circuit

• Undervoltage lockout (UVLO)

• Wide operating voltage range

Use the following complete part numbers when ordering:

Part Number Package Packing*

ATS616LSGTN-T 4-pin plastic SIP 13-in. reel, 800 pieces/reel

*Contact Allegro for additional packaging and handling options.

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

www.allegromicro.com

ATS616LSG

Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor

Functional Block Diagram

VCC

Hall

Amp

Hall

Amp

Voltage

Regulator

Gain

UVLO

Reference

Generator

GND

Track and

Hold

Track and

Hold

(Recommended)

Power-On

Logic

Tooth and Valley
Comparator

TEST

Current

Limit

VOUT

ATS616LSG-DS, Rev. 1

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

www.allegromicro.com

2

ATS616LSG

Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor

OPERATING CHARACTERISTICS over operating voltage and temperature range, unless otherwise noted

Characteristic Symbol Test Condition Min. Typ.1Max. Units

ELECTRICAL CHARACTERISTICS

Supply Voltage

2

Power-On State POS VCC = 0 → 5 V – HIGH – V

V

Operating, TJ < 165°C 3.5 – 24 V

CC

Undervoltage Lockout Threshold V

Output On Voltage V

OUT(SAT)IOUT

Supply Zener Clamp Voltage V

Output Zener Clamp Voltage V

Supply Zener Current I

Output Zener Current I

Output Current Limit I

Output Leakage Current I

OUTOFFVOUT

Supply Current I

Power-On Time t

Output Rise Time

Output Fall Time

3

3

CC(UV)VCC

ZsupplyICC

ZoutputIOUT

ZsupplyVS

ZoutputVOUT

OUTMVOUT

CC

PO

t

r

t

f

= 0 → 5 V; VCC = 5 → 0 V – – 3.5 V

= 20 mA – 200 400 mV

= 16 mA, TA = 25°C 28 – – V

= 3 mA, TA = 25°C 30 – – V

= 28 V – – 15 mA

= 30 V – – 3 mA

= 12 V 25 45 55 mA

= 24 V – – 15 μA

VCC > V

CC(min)

3 6 12 mA

VCC > 5 V – 80 500 μs

R

= 500 Ω, CS = 10 pF – 0.3 5.0 μs

LOAD

R

= 500 Ω, CS = 10 pF – 0.2 5.0 μs

LOAD

PERFRORMANCE CHARACTERISTICS

Operating Air Gap Range AG Operating within specification, Target Speed > 10 rpm 0.4 – 2.5 mm

Operating Magnetic Flux Density

Differential

4

B

AG(p-p)

Operating within specification, Target Speed > 10 rpm 60 – – G

Operating Frequency ƒ 10 – 10 000 Hz

Initial Calibration Cycle

Calibration Mode Disable n

Relative Timing Accuracy, Sequential E

Allowable User Induced Differential Offset

1

Typical data is at VCC = 8 V and TA = 25°C. Performance may vary for individual units, within the specified maximum and minimum limits.

2

Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.

3

CS is the probe capacitance of the oscilloscope used to make the measurement.

4

10 G = 1 mT (millitesla), exactly.

5

Non-uniform magnetic profiles may require additional edges before calibration is complete.

5

n

Output edges before calibration is completed, at f

cal

Output falling edges for startup calibration to be complete 64 64 64 Edge

dis

Target Speed = 1000 rpm, B

θ

Target Speed = 1000 rpm, B

4

ΔB

Output switching only; may not meet data sheet specifica-

App

tions

> 100 G – ±0.5 ±0.75

AG(p-p)

> 60 G – – ±1.5

AG(p-p)

< 100 Hz 1 1 1 Edge

sig

– – ±50 G

(°)

(°)

ATS616LSG-DS, Rev. 1

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

www.allegromicro.com

3

ATS616LSG

Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect 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 Radial-Tooth 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

ATS616LSG-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

4

ATS616LSG

Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor

Characteristic Data

Supply Current (Off) versus Supply Voltage

9

8

7

6

(mA)

5

4

CCOFF

I

3

2

1

0

010201552530

VCC (V)

TA (°C)

–40

150

25
85

Supply Current (Off) versus Ambient Temperature

9

8

7

6

(mA)

5

4

CCOFF

I

3

2

1

0

–50 0 50 100 150 200

TA (°C)

VCC (V)

3.5

5.0
12
24

Supply Current (On) versus Supply Voltage

9

8

7

6

5

(mA)

4

CCON

I

3

2

1

0

010201552530

Supply Current (On) versus Ambient Temperature

9

8

7

6

(mA)

5

4

CCON

I

3

2

1

0

–50 0 50 100 150 200

V

(V)

VCC (V)

CC

TA (°C)

T

(°C)

A

–40

150

VCC (V)

3.5

12
24

25
85

5.0

Output Voltage (On) versus Ambient Temperature

350

300

250

(mV)

200

150

OUT(SAT)

V

100

50

0

–50 0 50 100 150 200

(°C)

T

A

Continued on the next page.

ATS616LSG-DS, Rev. 1

I

SINK

(mA)

20

Output Leakage Current versus Ambient Temperature

1.2

1.0

0.8

(µA)

0.6

OUTOFF

0.4

I

0.2

0

–50 0 50 100 150 200

TA (°C)

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

www.allegromicro.com

V

(V)

OUT

10

5