ATS660LSB: True Zero-Speed Hall-Effect Adaptive Gear-Tooth Sensor IC

ATS660LSB
True Zero Speed Hall Effect Adaptive Gear Tooth Sensor IC
Discontinued Product
These parts are no longer in production The device should not be
purchased for new design applications. Samples are no longer available.
Date of status change: May 1, 2006
Recommended Substitutions:
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a
product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information
included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor
for any infringements of patents or other rights of third parties which may result from its use.
Da t a S h e e t
27627.107a
ATS660LSB
TRUE ZERO-SPEED, HALL-EFFECT
ADAPTIVE GEAR-TOOTH SENSOR IC
1
2
3
4
Pin 1 = Supply
Pin 2 = Output
Pin 3 = Internal Connection
Pin 4 = Ground
Dwg. AH-006-4
ABSOLUTE MAXIMUM RATINGS
at TA = 25°C
Supply Voltage, VCC ........................ 26.5 V*
Reverse Supply Voltage, VRCC ............ -24 V
Output OFF Voltage, VOUT ................. 26.5 V
Reverse Output Voltage, VROUT .......... -24 V
Continuous Output Current, IOUT ....... 20 mA
Reverse Output Current, IROUT .......... 50 mA
Package Power Dissipation,
PD .......................................... See Graph
Operating Temperature Range,
TA ............................. -40°C to +150°C*
Junction Temperature,
(continuous), TJ .......................... +165°C
(100 hr), TJM ............................... +180°C
Storage Temperature, TS ................... +170°C
* Operation at increased supply voltages with
external circuitry is described in Applications
Information. Devices for operation at increased temperatures are available on special
order.
The ATS660LSB is an ideal gear-tooth sensor IC solution for uniform
teeth targets as found in today’s demanding transmission applications.
This digital differential Hall-effect circuit is the choice when repeatability and timing accuracy count. The ATS660LSB incorporates patented
self-calibration circuitry (U.S. Pat. 5,917,320) that nulls out the effects
of installation air gap, ambient temperature, and magnet offsets to
provide superior timing accuracy with symmetrical targets over large
operating air gaps — typical of targets used in speed-sensing applications (pitches varying from below 0.5 to over 1.2 teeth per diametric
millimeter). The self-calibration at power up keeps the performance
optimized over the life of the device. The ATS660LSB has an opencollector output for direct digital interfacing with no further signal
processing required. This device is available in a small 9-mm diameter
by 7-mm long package for optimal manufacturing.
The integrated circuit incorporates a dual-element Hall-effect
IC and signal processing that switches in response to differential
magnetic signals created by the ferrous gear teeth. The circuitry
contains a sophisticated digital circuit to eliminate magnet and system
offsets and to achieve true zero-speed operation . D-to-A converters are
used to adjust the device gain at power on and to allow air-gap independent switching, which greatly reduces vibration sensitivity of the
device.
FEATURES AND BENEFITS
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
Fully optimized differential digital gear-tooth sensor IC
Single-chip sensing IC for high reliability
High vibration immunity
Precise duty cycle
Small mechanical size (9 mm diameter x 7 mm length)
Automatic gain control circuitry (self calibration)
True zero-speed operation
Under-voltage lockout
Wide operating temperature range
Optimized Hall IC magnetic circuit
Digital signal processing
Large operating air gap range
Wide operating voltage range
Excellent repeatability performance
Defined power-on state
Always order by complete part number: ATS660LSB .
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
FUNCTIONAL BLOCK DIAGRAM
1 SUPPLY
3 INTERNAL
CONNECTION
32 V
E1
–
–
+
MAGNET
X
REF
POSITIVE PEAK
DIGITAL PROC.
+
E2
NEGATIVE PEAK
DIGITAL PROC.
–
REFERENCE
GENERATOR
X
POWER-ON
LOGIC
UVLO
+
–
THRESHOLD
COMPARATORS
OUTPUT
OUTPUT
LOGIC
REG
+
2
CONTROL
CURRENT
LIMIT
<1Ω
GROUND
4
Dwg. FH-019-2A
Pin 3 must be externally connected to pin 4.
ALLOWABLE PACKAGE POWER DISSIPATION IN mW
1000
2
800
RθJA = 147°C/W
10
0
600
CO
NT
HO
UR
S
IN
UO
M
AX
.
US
400
200
0
20
40
60
100
140
80
120
AMBIENT TEMPERATURE IN °C
160
180
Dwg. GH-065-6
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2002 Allegro MicroSystems, Inc.
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
ELECTRICAL CHARACTERISTICS at VCC = VOUT = 12 V and TA = +25°C (unless otherwise
noted).
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Supply Voltage
VCC
Operating, TJ < 165°C
4.5
12
24
V
Power-On State
POS
VCC = 0 → 5 V
VCC(UV)
VCC = 0 → 5 V
4.1
4.2
4.3
V
Low Output Voltage
VOUT(SAT)
IOUT = 20 mA
–
0.2
0.4
V
Output Current Limit
IOUTM
25
45
55
mA
–
0.2
10
µA
Under-Voltage Lockout
HIGH* HIGH* HIGH*
–
Output LeakageCurrent
IOFF
VOUT = 24 V
Supply Current
ICC
Output off
3.5
7.0
12
mA
Output on
5.0
8.5
14
mA
Output Rise Time
Ir
RL = 500 Ω, CL = 10 pF
–
0.2
5.0
µs
Output Fall Time
If
RL = 500 Ω, CL = 10 pF
–
0.2
5.0
µs
Power-On Time
ton
Reference gear, <100 rpm
–
–
200
µs
Zener Voltage
VZ
IZT = TBD
–
32
–
V
* Output transistor is OFF (high logic level).
www.allegromicro.com
3
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
OPERATION with reference gear at TA = +25°C.
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Ma x .
Units
Air-Gap Range
AG
Operational
0.5
–
2.5
mm
Calibration Cycle
ncal
Output edges before which
calibration is completed
–
2
6
Edges
Recalibration (Update)
nrcal
Operating
64
64
64
Teeth
Minimum Speed
vmin
Teeth (cycles) per second
–
0
–
kHz
Maximum Speed
vmax
Teeth (cycles) per second
–
20
–
kHz
Duty Cycle Range
DC
1000 rpm, 0.5 mm < AG < 2.0 mm
–
–
±5
%
REFERENCE GEAR DIMENSIONS
Limits
Characteristic
Min.
Typ.
Ma x .
Units
DO
–
120
–
mm
Tooth Width
T
–
3.0
–
mm
Valley Width
(pC – T)
–
3.0
–
mm
Valley Depth
ht
–
3.0
–
mm
Thickness
F
3.0
–
–
mm
Diameter
4
Symbol
Description
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
12
12
10
10
SUPPLY CURRENT IN mA
SUPPLY CURRENT IN mA
TYPICAL CHARACTERISTICS
8.0
6.0
4.0
B > BOP
TA = 150°C
TA = +25°C
TA = -40°C
2.0
0
0
5
10
15
20
25
4.0
0
30
B < BRP
TA = 150°C
TA = +25°C
TA = -40°C
0
5
10
15
20
25
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-041-4
30
Dwg. GH-041-3
350
1.2
300
OUTPUT SATURATION VOLTAGE IN mV
1.0
SUPPLY CURRENT IN mA
6.0
2.0
SUPPLY VOLTAGE IN VOLTS
TA = 150°C
TA = +25°C
TA = -40°C
0.8
0.6
0.4
0.2
0
-30
8.0
-25
-20
-15
-10
REVERSE SUPPLY VOLTAGE IN VOLTS
www.allegromicro.com
-5.0
0
Dwg. GH-031-2
B > BOP
TA = 150°C
TA = +25°C
TA = -40°C
250
200
150
100
50
0
0
5.0
10
15
20
25
OUTPUT SINK CURRENT IN mA
Dwg. GH-059-1
5
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
TYPICAL DUTY CYCLE AS A FUNCTION OF AIR GAP
— CURVES COMING
6
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
DEVICE DESCRIPTION
The use of the devuce is simple. After correct power is
applied to the component, it is capable of instantly providing digital information that is representative of the profile
of a rotating gear. No additional optimization or processing circuitry is required. This ease of use should reduce
design time and incremental assembly costs for most
applications.
Sensing technology. The ATS660LSB contains
a single-chip differential Hall-effect sensor IC, a
samarium-cobalt pellet, and a flat ferrous pole piece.
The Hall IC consists of two Hall elements spaced 2.2 mm
apart, located so as to measure the magnetic gradient
created by the passing of a ferrous object (a gear tooth).
The two elements measure the field gradient and convert it
to a voltage that is then processed to provide a digital
output signal.
Internal electronics. The ATS660LSB is a selfcalibrating IC that contains two Hall-effect elements, a
temperature-compensated amplifier, and offset cancellation circuitry. Also contained in the device is a voltage
regulator to provide supply rejection over the operating
voltage range.
The self-calibrating circuitry is unique. After power up,
the device measures the peak-to-peak magnetic signal and
adjusts the gain using an on-chip D-to-A converter to
make the internal signal amplitude constant independent of
the installation air gap of the application. This feature
allows air-gap-independent operational characteristics.
1000
800
DIFFERENTIAL MAGNETIC FIELD IN GAUSS
Device description. The ATS660LSB true zero-speed
gear-tooth sensor IC is a Hall IC + pellet configuration that is fully optimized to provide digital detection of
gear-tooth* edges in a small package size. The IC is
packaged in a miniature plastic housing that has been
optimized for size, ease of assembly, and
manufacturability. High operating-temperature materials
are used in all aspects of construction.
600
400
200
0
-200
-400
-600
AG = 2.75 mm
0.25 mm INTERVALS
AG = 0.25 mm
-800
-1000
RELATIVE TARGET POSITION
Dwg. GH-061-2
IC
POLE PIECE
SOUTH
Magnetic signal
1000
800
RARE EARTH
PELLET
ELECTRICAL SIGNAL IN mV
600
NORTH
400
200
0
-200
-400
-600
-800
1
2
3
4
Dwg. MH-016-4
* In application, the terms “gear” and “target” are often interchanged. However, “gear” is preferred when motion is transferred.
www.allegromicro.com
AG = 2.75 mm
AG = 0.25 mm
-1000
RELATIVE TARGET POSITION
Dwg. GH-061-3
Elecrtical signal after gain control
7
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
DEVICE DESCRIPTION — Continued
In addition to the gain control circuitry, the device also
has provisions to zero out chip, magnet, and installation
offsets. This is accomplished using two D-to-A converters
that capture the peak and valley of the signal and use them
as a reference for the switching comparator. This allows
the switch points to be precisely controlled independent of
air gap or temperature.
The two Hall transducers and the electronics are integrated on a single silicon substrate using a proprietary
BiCMOS process.
Solution advantages. The ATS660LSB true zerospeed detecting gear-tooth sensor IC uses a differential Hallelement configuration. This configuration is superior in
most applications to a classical single-element GTS. The
single-element configuration commonly used requires the
detection of an extremely small signal (often <100 G) that
is superimposed on an extremely large back biased field,
often 1500 G to 3500 G. For most gear configurations, the
back-biased field values change due to concentration
effects, resulting in a varying baseline with air gap, with
eccentricities, and with vibration. The differential configuration eliminates the effects of the back-biased field
through subtraction and, hence, avoids the issues presented
by the single Hall element. The signal-processing circuitry
also greatly enhances the functionality of this device.
Other advantages are
■ temperature drift* — changes in temperature do not
greatly affect this device due to the stable amplifier design
and the offset rejection circuitry,
■ timing accuracy/duty cycle variation due to air gap*
— the accuracy variation caused by air-gap changes is
minimized by the self-calibration circuitry. A two-to-three
times improvement can be seen over conventional zerocrossing detectors,
■ dual edge detection — because this device references
the positive and negative peaks of the signal, dual edge
detection is guaranteed,
■ immunity to magnetic overshoot — the air-gap
independent hysteresis minimizes the impact of overshoot
on the switching of device output,
■ response to surface defects in the gear — the gainadjust circuitry reduces the effect of minor gear anomalies
that would normally causes false switching,
■ immunity to vibration and backlash — the gain-adjust
circuitry keeps the hysteresis of the device roughly proportional to the peak-to-peak signal. This allows the device to
have good immunity to vibration even when operating at
close air gaps,
■ immunity to gear run out — the differential-element
configuration eliminates the base-line variations caused by
gear run out, and
■ use with stamped-gear configurations — the highsensitivity switch points allow the use of stamped gears.
The shallow mechanical slopes created by the stamping
process create an acceptable magnetic gradient down to
zero speed. The surface defects caused by stamping the
gear are ignored through the use of gain control circuitry.
Operation versus air-gap/tooth geometry. Operating specifications are impacted by tooth size, valley size
and depth, gear material, and gear thickness. In general,
the following guidelines should be followed to achieve
greater than 2 mm air gap from the face of unit:
■ tooth width (T) > 2 mm;
■ valley width (pC - T) > 2 mm;
■ valley depth (ht) > 2 mm;
■ gear thickness (F) > 3 mm; and the
■ gear material must be low-carbon steel.
Signal duty cycle. For regular tooth geometry, precise
duty cycle is maintained over the operating air-gap and
temperature range due to an extremely good symmetry in
the magnetic switch points of the device. For irregular
tooth geometry, there will a small but noticeable change in
pulse width versus air gap.
* Target must be rotating for proper update algorithim
operation.
8
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
DEVICE DESCRIPTION — Continued
Power-on state operation. The device is guaranteed
to power on (power up) in the off state (high output
voltage) regardless of the presence or absence of a gear
tooth.
Under-voltage lockout. If the supply voltage falls
below the minimum operating voltage (VCC(UV)), the
device output will turn off (high output voltage) and stay
off irrespective of the state of the magnetic field. This
prevents false signals caused by under-voltage conditions
from propagating through to the output of the IC.
Output. The output of the IC is a short-circuitprotected open-collector stage capable of sinking 20 mA.
An external pull-up (resistor) to a supply voltage of not
more than 26.5 V must be supplied.
Output polarity. The output of the device will switch
from off to on as the leading edge of the target passes the
package in the direction indicated (pin 4 to pin 1), which
means that the output voltage will be low when the unit is
facing a tooth. If rotation is in the opposite direction (pin
1 to pin 4), the output of the device will switch from on to
off as the leading edge of the target passes the package,
which means that the output voltage will be high when the
unit is facing a tooth.
4
3
2
1
Dwg. AH-006-1
APPLICATIONS INFORMATION
Power supply protection. The device contains an onchip regulator and can operate over a wide supply voltage
range. For devices that need to operate from an unregulated power supply, transient protection should be added
externally. For applications using a regulated line, EMI/
RFI protection is still required. Incorrect protection can
result in unexplained pulses on the output line, providing
inaccurate sensing information to the user.
EMI protection circuitry can easily be added to a PC board
for use with this device. Provisions have been made for
easy mounting of this board on the back of the unit. PC
board installation parallel to the device axis is also possible.
www.allegromicro.com
4
3
2
1
Dwg. AH-007
9
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
APPLICATIONS INFORMATION — Continued
Operation from a regulated power supply. These
devices require minimal protection circuitry during
operation from a low-voltage regulated line. The on-chip
voltage regulator provides immunity to power supply
variations between 4.5V and 26.5V. However, even
while operating from a regulated line, some supply and
output filtering is required to provide immunity to coupled
and injected noise on the supply line. A basic RC lowpass circuit (R1C1) on the supply line and an optional
output capacitor (C2) is recommended for operation in
noisy environments. Because the device has an
open-collector output, an output pull-up resistor (RL) must
be included either at the IC output (pin 2) or by the
signal processor input.
Operation from an unregulated power supply. In
automotive applications, where the device receives its
power from an unregulated supply such as the battery, full
protection is generally required so that the device can
withstand the many supply-side transients. Specifications
for such transients vary between car manufacturers, and
protection-circuit design should be optimized for each
application.
In the circuit shown, a standard protection circuit is
constructed using discrete components. The Zener diode
is used to provide over-voltage protection against load
dumps greater than about 40 V; for load dumps less than
about 40 V, the internal Zener is sufficient. The series
resistor (R ) provides current limiting and with the capaci1
tor (C ) noise filtering. The Zener diode and current1
limiting resistor should be sized for power dissipation
requirements. The series diode protects the external Zener
diode against reverse battery and provides protection
against transients greater than -24 V; it must be rated to
withstand the most negative transient. In many transmission applications there is already a Zener diode in the
TCU, and the diode and external Zener are not necessary.
10
SUPPLY
OUTPUT
C2
100 pF
RL
20 Ω
R1
C1
0.1 µF
1
2
3
X
X
4
Vcc
+
-
Dwg. EH-008-7
Operation from regulated supply
OUTPUT
SUPPLY
C2
100 pF
RL
R1
C1
1
2
4
3
Vcc
X
X
+
-
Dwg. EH-008-6
Operation from unregulated supply
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
APPLICATIONS INFORMATION — Continued
The ATS660LSB is designed to minimize performance
variation (caused by the large air-gap variations resulting
from installation) by self-calibrating at power-on. These
functions should be tested using the procedures described
below.
Duty cycle capabilities after correct self-calibration can
be measured as follows:
1. Set the air gap to the desired value.
2. Power down and then power up the device.
3. Rotate the gear at the desired speed.
4. Wait for calibration to complete (64 output pulses to
occur).
5. Monitor output for correct switching and measure
accuracy.
6. Repeat the above for multiple air gaps within the
operating range of the device.
7. This can be repeated over the entire operating temperature range.
There is an internal update algorithm that will maintain
the correct duty cycle as air gap changes with temperature.
Large changes in air gap will require the part to be reset
(by cycling power) to maintain the correct duty cycle.
Measurement of the effect of changing air gap after
power up:
1. Set the air gap to the desired value (nominal, for
example). Rotate the gear at the desired speed. Apply
power to the IC. Wait for 64 output pulses to occur.
Monitor output for correct switching and measure accuracy.
2. Change the air gap by ±0.25 mm. Do not re-power the
IC. Wait for update algorithm to finish adjusting
thresholds, typically 1 to 2 rotations on a 60-tooth gear.
Operation with fine-pitch gears. For targets with a
circular pitch of less than 4mm, a performance improvement can be observed by rotating the front face of the
package. This package rotation decreases the effective
element-to-element spacing and increases the capability of
detecting fine tooth or valley configurations, provided that
the Hall elements are not rotated beyond the width of the
target.
2.2 COS α
Recommended evaluation technique. The selfcalibrating feature of the ATS660LSB requires that a
special evaluation technique be used to measure its highaccuracy performance capabilities. Installation inaccuracies are calibrated out at power on; hence, it is extremely
important that the device be repowered at each air gap
when gathering duty cycle data.
2.2
α
TARGET FACE WIDTH, F
>2.2 SIN α
A
A
Dwg. MH-018-5 mm
Allegro
www.allegromicro.com
11
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
APPLICATIONS INFORMATION — Continued
Signal timing accuracy. The magnetic field profile
width is defined by the Hall element spacing and narrows in degrees as the target diameter increases. This
results in improved timing accuracy performance for larger
gear diameters (for the same number of gear teeth).
Valley-to-tooth transistions will generally provide better
accuracy than tooth-to-valley transitions for large-tooth or
large-valley configurations. For highest accuracy, targets
greater than 100mm in diameter should be used.
Additional applications Information on gear-tooth
and other Hall-effect devices is also available in the “HallEffect IC Applications Guide”, which can be found in the
latest issue of the Allegro MicroSystems Electronic Data
Book, AMS-702 or Application Note 27701, or at
www.allegromicro.com
Signal duty cycle. For repetitive target structures,
precise duty cycle is maintained over the operating air gap
and temperature range due to an extremely good symmetry
in the magnetic switch points and the internal self calibration of the device. For irregular tooth geometries, there
will be a small but measureable change in pulse width
versus air gap.
CRITERIA FOR DEVICE QUALIFICATION
All Allegro devices are subjected to stringent qualification requirements prior to being released to production. To
become qualified, except for the destructive ESD tests, no failures are permitted.
Qualification Test
Test Method and
Test Conditions
Test Length
Samples
Per Lot
Temperature Humidity
Bias Life
JESD22-A101,
TA = 85°C, RH = 85%
1000 hrs
77
Bias Life
JESD22-A108,
TA = 150°C, TJ ≤ 165°C
1000 hrs
77
(Surge Operating Life)
TA = 175°C, TJ ≤ 190°C
168 hrs
77
Autoclave, Unbiased
JESD22-A102,
TA = 121°C, 15 psig
96 hrs
77
High-Temperature
(Bake) Storage Life
JESD22-A103,
TA = 170°C
1000 hrs
77
Temperature Cycle
JESD22-A104
1000 cycles
77
-55°C to +150°C
ESD,
Human Body Model
CDF-AEC-Q100-002
Pre/Post
Reading
3 per
test
Test to failure
All leads > x kV
12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Comments
Device biased for
minimum power
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR IC
MECHANICAL INFORMATION
Component
Package Face
Material
Function
Thermoset epoxy
Units
170
°C*
Maximum temperature
Plastic Housing
Thermoplastic PBT
264 psi deflection temp. (DTUL)
66 psi deflection temp. (DTUL)
Approximate melting temperature
204°C
216°C
225°C
Leads
Copper
—
—
Lead Finish
90/10 tin/lead solder plate
—
†
Lead Pull
—
—
8N
*Temperature excursions to 225 °C for 2 minutes or less are permitted.
† All industry-accepted soldering techniques are permitted for these packages, provided the indicated maximum temperature for each component (e.g., package face, plastic housing) is not exceeded. Reasonable dwell times, which do not cause
melting of the plastic housing, should be used.
Hall element location (in millimeters)
(location relative to package center is the design objective)
2.2 mm
Lead cross section (in millimeters)
0.48
0.36
0.41
NOM.
0.38
0.44
0.35
NOM.
A
0.0076
MIN. PLATING
THICKNESS
Dwg. MH-018-4 mm
Dwg. MH-019A mm
Allegro
www.allegromicro.com
13
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR
DIMENSIONS IN MILLIMETERS
1.27
8.8
7.0
TYP
1
2
3
7.0
4
0.41
0.38
3.9
3.0 NOM
A
0.9 DIA
8.09
2.0
8.96
Dwg. MH-017-1B mm
Tolerances, unless otherwise specified: 1 place ±0.1 mm, 2 places ±0.05 mm.
The products described herein are manufactured under one or more
of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719;
5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents
pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
14
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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