ALLEGRO ATS672LSB User Manual

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Preliminary – Subject to Change

PIN OUT DIAGRAM

4 3 2 1

Pin 1: V
Pin 2: V
Pin 3: Test Pin (Tie to GND)
Pin 4: Gnd

CC

OUT

ATS672LSB

Self-Calibrating TPO Gear-Tooth Sensor with

The ATS672LSB true zero-speed gear-tooth sensors are
optimized Hall IC/magnet configurations packaged in a single in­line package (SIP) that provides a user-friendly solution for digital
gear-tooth-sensing applications. The SIP module consists of an
over-molded package, which holds together a samarium cobalt
magnet, a pole piece 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 single-element Hall IC that switches
in response to magnetic signals created by a ferrous target. The
IC contains a sophisticated digital circuit designed to eliminate the
detrimental effects of magnet and system offsets. Signal
processing is used to provide zero-speed performance
independent of air gap and also to dynamically adapt device
performance to the typical operating conditions found in
automotive applications (reduced vibration sensitivity). High­resolution (9-bit) peak-detecting DACs are used to set the adaptive
switching thresholds of the device. Hysteresis in the thresholds
reduces the negative effects of any anomalies in the magnetic
signal (such as magnetic overshoot).

9-Bit Signal Capture

ABSOLUTE MAXIMUM RATINGS

Supply Voltage,
V
Reverse Supply Voltage,
V
Reverse Current Through Output,
I
Continuous Output Current,
I
Storage Temperature,
T
Package Power Rating,
R
Maximum Junction Temperature,
T
Maximum Junction Temperature – 100 Hours,
T

. . . . . . . . . . . . . . . . . . . . . . . . . . 28 V

CC

. . . . . . . . . . . . . . . . . . . . . . . . . . . . –18 V

R

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

R

. . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

OUT

. . . . . . . . . . . . . . . . . . . . . . . . . . . 170° C

S

. . . . . . . . . . . . . . . . . . . ~150°C/W

θJA

. . . . . . . . . . . . . . . . . . . . . . . . . 170° C

Jmax

. . . . . . . . . . . . . . . . . . . . . . . . . 180° C

Jmax

The ATS672LSB also includes a low-bandwidth filter that
increases the noise immunity and the signal-to-noise ratio of the
sensor. These features result in potential improvements in both
the timing accuracy and the jitter performance of the device. The
ATS672LSB sensor system is optimized for cam applications.
Four versions of this device are available. The sensor can be
chosen to have a high or low output signal in response to a “tooth”.
The sensor is also available with and without TPOS (true power on
state) capability. The low-on-tooth sensor without TPOS is
available through general sales. (Part # ATS672LSB-LN). For
other versions please contact the factory. Some restrictions may
apply.

FEATURES

 Tight timing accuracy over temperature
 True zero-speed operation
 True power-on sensing
 Air gap independent switch points
 High vibration immunity
 Large operating air gaps
 Operation down to 3.3 V
 Digital output representing target profile
 Single-chip solution for high reliability
 Small mechanical size
 Optimized Hall IC magnetic system
 AGC and reference-adjust circuit

 Undervoltage lockout

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

OPERATING CHARACTERISTICS Valid at T

otherwise noted

Characteristics Symbol Test Conditions

ELECTRICAL CHARACTERISTICS

Supply Voltage VCC Operating; TJ < TJmax 3.3 26.5 V

= -40°C to +150°C and power supply within specification unless

A

Limits

Min. Typ. Max. Units

Reverse Supply Voltage V

I

RCC

= -5 mA (max) -18 V

RCC

Supply Zener Clamp Voltage VZ 28 33 37 V

Supply Zener Current IZ Tj < Tjmax; pulsed 100 mA

Output = off 3.0 6.5 11 mA

Supply Current ICC

Output = on 3.0 6.5 11 mA

POWER-ON STATE CHARACTERISTICS

Power Up Time t

Under Voltage Lockout V

PO

UV

Gear Speed < 100 rpm; Vcc> 3.3 V - 500 µs

- <Vcc

Min

V

OUTPUT STAGE

Low Output Voltage V

Output Current Limit I

Output Leakage Current I

Output Rise Time t

Output Fall Time t

I

OUT

lin

OFF

r

f

OUT

Output = ON, Tj < Tjmax 25 45 70 mA

Output = off, V

RL = 500 Ω, CL = 10 pF, TA = 25°C

RL = 500 Ω, CL = 10 pF, TA = 25°C

= 15 mA, Output = on - 0.2 0.45 V

OUT

= Vcc

- 10

(Max)

- 0.9 5.0

- 0.5 5.0

µA

µs

µs

Rise and Fall Time

Output High

90%

100%

10%

t

r

Rev. 1.2 May 1, 2002

Page 2 of 12

90%

10%

t

f

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

Output Low

Time

[Seconds]

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

Limits

Characteristics Symbol Test Conditions

Min. Typ. Max. Units

SWITCH POINT CHARACTERISTICS

Tooth Speed S

Bandwidth f-3db 40 kHz

Operate Point Bop%

Release Point Brp%

Output Polarity
ATS672LSB-LN (no TPOS)
ATS672LSB-LT (with TPOS)*

Output Polarity
ATS672LSB-HN (no TPOS)*
ATS672LSB-HT (with TPOS)*

* Restrictions on availability may apply.

Calibration

Initial Calibration CI

AGC Disable Cf

max

V

OUT

V

OUT

0 8.0 kHz

% of peak to peak referenced to tooth
signal, AG < Agmax;
% of peak to peak referenced to tooth
signal, AG < Agmax;

Over valley HIGH

Over tooth LOW

Over valley LOW

Over tooth HIGH

Number of rising mechanical edges for

accurate edge detection

Number of rising mechanical edges

required to complete AGC calibration

+30 %

+40 %

3 Edges

3 Edges

Switchpoints

Tooth Signal

Bop%

100%

Brp%

Bop%

Brp%

Valley Signal

Rev. 1.2 May 1, 2002

Page 3 of 12

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

OPERATION WITH 8X Reference Target over Operational Air Gap and Temperature with Test Circuit #1 Unless
Otherwise Stated

Characteristics Symbol Test Conditions

Limits

Min. Typ. Max. Units

t

ICRel

Rising and falling edge, RPM = 1000
during initial calibration

3.0 6.0 °

gear eccentricity < 0.1 mm

1

Relative Timing Accuracy

t

Rel

Rising mechanical edge
after initial calibration, RPM = 1000

- 0.3 0.6 °
gear eccentricity < 0.1 mm
Falling mechanical edge

t

Rel

after initial calibration, RPM = 1000

- 0.5 0.8 °
gear eccentricity < 0.1 mm
Rising mechanical edge

t

2

Absolute Timing Accuracy

AbsRise

air gap: 1.5mm, temperature: 25°C
RPM: 1000
Falling mechanical edge

t

AbsFall

air gap: 1.5mm, temperature: 25°C

- -0.2 - °

- +0.6 - °
RPM: 1000

3

Phase Delay t

4

TPOS Air Gap Min

ATS672LSB – LT and HT

5

TPOS Air Gap Range

ATS672LSB – LT and HT

6

TPOS Air Gap Max

ATS672LSB – LT and HT

RelSpeed

AG

AG

TPOS

AG

After initial calibration
air gap: 1.5 mm, temperature: 25°C

Valleys may be detected as teeth:

Min

incorrect TPOS

- 6.66 -

- - 0.5 mm

Distance for correct TPOS functionality 0.5 - 2.25 mm

Teeth may be detected as a valley:

Max

incorrect TPOS

2.25 - 5.0 mm

Operational Air Gap Range AG Output switching: running mode only 0.5 - 2.25 mm

x 10

/ RPM

-5

°

Edge Repeatability

t

θE

360° repeatability, 1000 edges 0.04

°

1

Relative Timing Accuracy Range is the change in edge position over the operational air gap and temperature range that

can be expected from a single device. This does not include part-to-part variation.

2

The Typical Absolute Timing Accuracy is the difference between the target mechanical edge (rising or falling) and the

corresponding sensor electrical edge.

3

Phase Delay is the change in edge position over the operational RPM range that can be expected from a single device.

This does not include part-to-part variation or variation due to temperature.

4

The TPOS Air Gap Min is the Installation Air Gap where the device may detect Valleys as Teeth. The True Power On

Function is NOT guaranteed to operate.

5

The TPOS Air Gap Range is the Installation Air Gap Range where the True Power On Function is guaranteed to

operate. Operating is defined as correctly detecting a tooth when powered up over a tooth and correctly detecting a valley
when powered up over a valley using the Reference Target. This specification is only valid for targets that meet or
exceed the ‘Gear Parameters for Correct TPOS Operation’ section of this document.

6

The TPOS Air Gap Max is the Installation Air Gap where the device may detect a Tooth as a Valley. The True Power On

Function is NOT guaranteed to operate.

Rev. 1.2 May 1, 2002

Page 4 of 12

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

Relative Timing Accuracy

Target

Device Output

T

(Max - Min) T

AbsRise

AbsFall

(Max - Min)

Operational Air Gap

Valley

Tooth

Air Gap

Absolute Timing Accuracy

Target

T

AbsRise

Device Output

T

AbsFall

T

AbsFall

(Max - Min)

TPOS Air Gap

Valley

Tooth

TPOS Air Gap

TPOS Air Gap

Range

Min

TPOS Air Gap

Max

Phase Delay with RPM

Phase Delay [°]

0 Max RPM

RPM

Rev. 1.2 May 1, 2002

Page 5 of 12

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

Output Rise Time: R = 500 Ω, C = 10 pF

Output Fall Time: R = 500 Ω, C = 10 pF

Rev. 1.2 May 1, 2002

Page 6 of 12

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

Reference Target Dimensions

Target

Reference Target 120 mm 6.0 mm 23.6 mm 23.6 mm 5.0 mm

Reference Target

Diameter

)

(D

o

Thickness

(F)

Reference Target Dimensions

GEAR PARAMETERS FOR CORRECT TPOS OPERATION

Valley Depth (ht) Depth of target valley 5.0 - - mm
Valley Width (PC – T) Length and width of target valley 13 - - mm
Tooth Width (T) Width of target tooth 5.0 - - mm
Thickness (F) Thickness or length of target tooth 5.0 - - mm

1

MATERIAL PROPERTIES: CRS 1018

1

The target must generate a minimum of 120 gauss difference between the tooth field and the valley field at the Maximum Installation

Air Gap. With the materiel and dimensions mentioned above the target will generate the required 120 gauss.

Tooth Width

(T)

Valley Width

(PC – T)

Limits Characteristic Description

Min. Typ. Max. Units

Valley Depth

(ht)

Rev. 1.2 May 1, 2002

Page 7 of 12

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

MECHANICAL INFORMATION

Component Material Function Value

Sensor Package

Material

SmCo – R22

Thermoset epoxy Max. temperature 170°C

8 mm D x

4 mm L

Leads Copper, 0.016” dia, 0.050” spacing

2

Lead Coating

1

Temperature excursions of up to 225°C for 2 minutes or less are permitted.

2

All industry accepted soldering techniques are acceptable for this sub-assembly as long as the indicated maximum

Solder, tin / lead 90/10

temperatures for each component are not exceeded.

DEVICE QUALIFICATION PROGRAM

Test Name Test Conditions Test Length

High Temperature
Operating Life

High Temperature Bake

Temperature Humidity
Bias

AEC-Q100 #2 (JA108)
Ta = 150°C, Tj = 165°C
AEC-Q100 #3 (JA103)
Ta = 170°C
AEC-Q100 #5 (JA101)
85°C/85%RH

408 hrs 3 77

1000 hrs 3 77

1008 hrs 3 77

Autoclave AEC-Q100 #6 (JA102) 96 hrs 3 77

Temperature Cycling AEC-Q100 #7(JA104) 500 cycles 3 77

ESD

Early Life Failure Rate

Thermal Shock

AEC-Q100 #20 (AEC-Q100­002, AEC-Q100-003)
AEC-Q100 #25 (AEC-Q100-

008)

-40°C to +150°C, 1 minute
transition, 10 minute dwell

- 1 3/model/step HBM & MM

150°C/24 hrs 3 800

100 cycles 3 77

# of Lots

Sample / lot Comments

-65°C to +160°C, 30 sec.
transition, 30 minute dwell

1

Rev. 1.2 May 1, 2002

Page 8 of 12

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

ATS672LSB

A

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

Functional Block Diagram

OFFSET

HALL AMP

ADJUST

TC
ADJUST

UTOMATIC GAIN CONTROL

LPF

DIFF

Offset TC

POR

Pin1
VCC

Internal

Regulator

(Analog)

Internal

Regulator

(Digital)

COMP_P

AGGRESSIVE

UPDATE

LOGIC

DIFF

OUTPUT

STATE

CLK

9-BIT

COUNTER

9-BIT PDAC

TPOS

TPOS

TRIM

PDAC

TPOS

OUTPUT

VTHRESH

THRESHOLD

POWER ON

OUTPUT

INITIALIZE

VREF

DIFF

THRESHOLD

COMPARATOR

THRESHOLD

OUTPUT

OUTPUT
DRIVER

Pin2

OUTPUT

STATE

COMP_N

OUTPUT

STATE

AGGRESSIVE

UPDATE

LOGIC

CLK

NDAC

9-BIT NDAC

1M OSC

9-BIT

COUNTER

Rev. 1.2 May 1, 2002

Page 9 of 12

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

ATS672LSB

k

Ω

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

EMC CAPABILITY

All EMC tests shall be conducted at 23±5°C

Test Name Reference Specification Circuit Parameters Performance

ISO 7637-1, Test Level
Inductive transient ISO 7637-1, Test pulse 1 Test circuit #1 - - - C
Inductive transient ISO 7637-1, Test pulse 2 Test circuit #1 - - - C
Switching transients ISO 7637-1, Test pulses 3a & 3b Test circuit #1 - - - A
Low voltage drop-out ISO 7637-1, Test pulse 4 Test circuit #1 - - - A
Load dump transient ISO 7637-1, Test pulse 5 Test circuit #1 A C
Starting transient ISO 7637-1, Test pulse 6 Test circuit #1 - ­Power-off transient ISO 7637-1, Test pulse 7 Test circuit #1 - - - C

ESD – Human Body
Model (HMB)
ESD – Machine Model
(MM)

Direct RF Injection ISO 11452-7 Test circuit #1 TBD
Bulk Current Injection ISO 11452-4 Test circuit #1 TBD
TEM Cell ISO 11452-3 Test circuit #1 Passes to 200 V/m

AEC-Q100-002 No additional components Passes to +/- TBD

AEC-Q100-003 No additional components Passes to +/- TBD

Test circuits for electromagnetic compatibility and Typical Operating Schematic

Test circuit 1

V

emc

R

S

100 Ω

0.1
µF

GND

Vs

1

4

5 V

R

1.2

L

2

120 pF

3 (Must be Grounded)

I II III IV

1

C E

1

C E

1

Additional protection circuitry is required to protect the device from destruction above this voltage level.

Rev. 1.2 May 1, 2002

Page 10 of 12

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

Power Derating Curve: ATS672LSB Package

Power Derating

Due to internal power consumption, the temperature of the
IC (junction temperature, Tj) is higher than the ambient
environment temperature, Ta. To ensure that the device
does not operate above the maximum rated junction
temperature use the following calculations:

∆T=P
Where P

∴ ∆T=Vcc * Icc * R

Where ∆T denotes the temperature rise resulting from the
IC’s power dissipation:
TJ = TA + ∆T R

Typical T

T

P
P
∆T=P
T

Maximum Allowable Power Dissipation Calculation

T
T
170 = 160 + ∆T

∆T = 10°C
∆T = P
∴ P

Maximum Vcc for P

P
Vcc = P

* R

D

θJA

=Vcc * Icc

D

θJA

=150°C/W TJ(max) = 170°C

θJA

Calculation:

=25°C, Vcc=5 V, Icc(On)=6.5 mA

A

=Vcc * Icc

D

= 5 V * 6.5 mA = 32.5 mW

D

= TA + ∆T = 25°C + 4.9°C = 29.9°C

J

= TA + ∆T

J

(max) = 170°C, if TA=160°C then:

J

=Vcc * Icc Icc = 10 mA (max) at 160°C

D

J

* R

= 32.5 mW * 150°C/W = 4.9°

D

θJA

* R

(R

D

θJA

= 10°C / 150°C/W = 66.6 mW @ TA = 160°C

D(max)

/ Icc = 66.6 mW / 10 mA = 6.66 V

D

= 150°C/W)

θJA

D(max)

=111 mW at TA=160°C

Maximum Power Dissipation vs. Ambient Temperature

1000

900

800

700

600

500

400

300

Dissipation [mW]

200

Maximum Allowable Power

100

SB Package: Thermal Resistance: 150°C/Watt

0

20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170

Ambient Temperature [°C]

Rev. 1.2 May 1, 2002

Page 11 of 12

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

SB PACKAGE DRAWING

Tolerances unless otherwise specified: 1 place ±0.1 mm, 2 places ±0.05 mm
NOTE: Nominal dimensions and tolerances dependent on package material

Rev. 1.2 May 1, 2002

Page 12 of 12

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1993, 1995 Allegro MicroSystems, Inc.