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ATS625LSG

ATS625LSG-DS, Rev. 1

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage

, V

.......................................26.5 V

Reverse-Supply Voltage, V

RCC

........................18 V

Reverse-Supply Current, I

RCC

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

Reverse-Output Voltage, V

ROUT

.....................0.5 V

Continuous Output Current, I

OUT

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

Output Sink Current, I

OUT

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

Operating Temperature
Ambient,

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

Maximum

Junction,

J(max)

........................165ºC

Maximum

Junction

100 hr, T

J(max100)

......180ºC

Storage Temperature, T

.................. 65ºC to 170ºC

*See the

Power Derating

section.

Highly repeatable over operating temperature range
Tight timing accuracy over operating temperature range
True zero-speed operation
Air-gapindependent 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

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.

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

True Zero-Speed Low-Jitter

High Accuracy Gear Tooth Sensor

Features and Benefits

Package SG, 4-pin Through Hole

1. VCC
2. VOUT
3. AUX
4. GND

Part Number

Pb-free

Packing

ATS625LSGTN

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

ATS625LSGTN-T

Yes

Contact Allegro for additional packing options.

Available by special request only.

Use the following complete part numbers when ordering:

ATS625LSG-DS, Rev. 1

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

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

ATS625LSG

ELECTRICAL CHARACTERISTICS

Supply Voltage

Operating; T

< T

Jmax

4.0

Undervoltage Lockout

CCUV

< V

CC(min)

Reverse Supply Current

RCC

= 18 V

Supply Zener Clamp Voltage

= 17 mA

Supply Zener Current

= 28 V

Supply Current

Output OFF

8.5

Output ON

8.5

POWER-ON CHARACTERISTICS

Power-On State

High

Power-On Time

Gear Speed < 100 RPM; V

> V

min

200

µs

OUTPUT STAGE

Low Output Voltage

OUT(SAT)

SINK

= 20 mA, Output = ON

200

450

Output Current Limit

OUT(LIM)

OUT

= 12 V, T

< T

Jmax

Output Leakage Current

OUT(OFF)

Output = OFF, V

OUT

= 24 V

µA

Output Rise Time

= 500 , C

= 10 pF

1.0

µs

Output Fall Time

= 500 , C

= 10 pF

0.6

µs

SWITCHPOINT CHARACTERISTICS

Speed

Reference target 60+2

12000

rpm

Bandwidth

Corresponds to switching frequency 3 dB

kHz

Operate Point

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

max

;

transitioning from LOW to HIGH

Release Point

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

max

;

transitioning from HIGH to LOW

CALIBRATION

Initial Calibration

Cal

Start-up

edges

Calibration Update

Cal

Running mode operation

continuous

Operating Characteristics

Valid at T

= 40°C to 150°C, T

J(max)

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

operating parameters: V

= 12 V and T

= 25°C

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Continued on the next page...

ATS625LSG-DS, Rev. 1

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

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

ATS625LSG

OPERATING CHARACTERISTICS with 60+2 reference target

Operational Air Gap

Measured from sensor branded face to
target tooth

0.5

2.5

Relative Timing Accuracy, Sequen-
tial Mechanical Rising Edges

ERR

Relative to measurement taken at
AG = 1.5 mm

±0.4

deg.

Relative Timing Accuracy, Sequen-
tial Mechanical Falling Edges

ERR

Relative to measurement taken at
AG = 1.5 mm

±0.4

deg.

Relative Timing Accuracy, Signa-
ture Mechanical Rising Edge

ERR

SIGR

Relative to measurement taken at
AG = 1.5 mm

±0.4

deg.

Relative Timing Accuracy, Signa-
ture Mechanical Falling Edge

ERR

SIGF

Relative to measurement taken at
AG = 1.5 mm

±1.5

deg.

Relative Repeatability, Sequential
Rising and Falling Edges

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

PEAK

IN(min)

and

6° period

0.08

deg.

Operating Signal

(min)

< AG < AG

(max)

Test condition is I

CC(max)

+ 3 mA.

Upper limit is I

CC(max)

+ 3 mA.

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

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.

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.

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

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

Operating Characteristics, continued

Valid at T

= 40°C to 150°C, T

J(max)

, over full range of AG, unless otherwise noted;

typical operating parameters: V

= 12 V and T

= 25°C

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

ATS625LSG-DS, Rev. 1

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

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

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

ATS625LSG

REFERENCE TARGET 60+2

Characteristics

Symbol

Test Conditions

Typ.

Units

Symbol Key

Outside Diameter

Outside diameter of target

120

t,t

SIG

Branded Face
of Sensor

Air Gap

Face Width

Breadth of tooth, with respect
to sensor

Circular Tooth Length

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

Signature Region Cir-
cular Tooth Length

SIG

Length of signature tooth,
with respect to sensor; mea-
sured at D

Circular Valley Length

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

Tooth Whole Depth

Material

Low Carbon Steel

Reference Target

Signature Region

60+2

of Sensor

Branded Face

Pin 4

Pin 1

Reference Target (Gear) Information

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

· 2 mm < tooth width, t < 4 mm

· Valley width, t

> 2 mm

· Valley depth, h

> 2 mm

· Tooth thickness, F 3 mm

· Target material must be low carbon steel

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, h

, is intrinsically infinite, so the criteria for

tooth width, t, valley width, t

, tooth material thickness, F, and

material specification need only be considered for reference. For
example, F can now be < 3 mm.

Figure 1. Configuration with Spur Gear Reference Target

Part Number ATS625LSG