ATS672LSB: Self-Calibrating TPOS Gear-Tooth Sensor IC with 9-Bit Signal Capture

ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
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.
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
Package SB, 4-pin SIP
4
3
21
1. VCC
2. VOUT
3. Test pin (tie to GND)
4. GND
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC .......................................... 28 V
Reverse-Supply Voltage, VRCC ........................ –18 V
Reverse-Output Voltage, VROUT ...................... ??? V
Continuous Output Current, IOUT .................. 20 mA
Reverse Output Current, IROUT ...................... 50 mA
Operating Temperature
Ambient, TA, .............................. –40ºC to 150ºC
Maximum Junction, TJ(max)........................170ºC
Maximum Junction ≤ 100 hr, TJ(max) .........180ºC
Storage Temperature, TS .................. –65ºC to 170ºC
Package Thermal Resistance, RθJA ........... 150 °C/W
The ATS672 true zero-speed gear tooth sensor IC provides manufacturer-friendly
solutions for digital gear tooth sensing applications, through an optimized configuration of Hall-effect IC and rare earth pellet, packaged together in a single SIP
(Single In Line Package). The SIP consists of an overmolded enclosure, which
encapsulates a samarium cobalt pellet, a pole piece, and a true zero-speed Halleffect IC that has been optimized to the magnetic circuit. This package can be
easily assembled and used in conjunction with gears of various shapes and sizes.
The ATS672 incorporates a single-element Hall-effect IC that switches in response
to the magnetic signal created by a ferromagnetic target (the gear). 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, such as reducing
sensitivity to vibration. High resolution (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) associated with the targets used in many automotive applications. The
ATS672 also includes a low-bandwidth filter that increases the noise immunity and
the signal-to-noise ratio of the IC. These features result in potential improvements
in both the timing accuracy and the jitter performance of the device.
The ATS672LSB version is optimized for gear tooth sensing applications. The
ATS672LSB-LT is optimized for cam sensing.
Features and Benefits
• Tight timing accuracy throughout
temperature range
• True zero-speed operation
• Air gap-independent switch points
• Large operating air gaps
• Single-chip solution for high reliability
• Small mechanical dimensions
• Optimized Hall-effect IC/magnetic
systems
• AGC and reference-adjust circuits
• Operation down to 3.3 V
• Undervoltage lockout
• Digital output representing target
profiles
Use the following complete part numbers when ordering:
Rev. 1.43
Part Number
Package
Application
ATS672LSB
4-pin plastic SIP
Gear tooth sensing
ATS672LSB-LT
4-pin plastic SIP
Cam sensing
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
Functional Block Diagram
VCC
Regulator
(Analog)
Regulator
(Digital)
Dynamic
Offset
Cancellation
Offset
TC
Low Pass
Filter
Automatic Gain Control (Analog)
Amp
TC Adjust
VREF
Threshold
Comparator
Output
Driver
Power On
Reset
VOUT
VTHRESH
GND
Test
2
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
OPERATING CHARACTERISTICS Valid at Ta = –40ºC to 150ºC, and VCC within specification, unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
3.3
–
26.5
V
–
–
–18
V
Electrical Characteristics
Supply Voltage
VCC
Operating; TJ < TJ(max)
Reverse Supply Voltage
VRCC
IRCC = –5 mA, maximum
Supply Zener Clamp Voltage
VZSupply ICC = 14 mA (≈ICC(max) + 3 mA); TA = 25°C
28
–
–
V
Output Zener Clamp Voltage
VZOutput IOUT = 3 mA; TA = 25°C
30
–
–
V
Supply Zener Current
IZSupply
Test conditions only; VCC = 28 V
–
–
ICC(max) + 3
mA
Output Zener Current
IZOutput
VOUT = 30 V
–
–
3
mA
Output = OFF
3
6.5
11
mA
Output = ON
3
6.5
11
mA
Gear Speed < 100 RPM; VCC > 3.3 V
–
–
500
μs
–
–
< VCC(min)
V
ISINK = 15 mA, Output = ON
–
0.2
0.45
V
Supply Current
ICC
Power-On State Characteristics
Power-On Time
tPO
Undervoltage Lockout
VUV
Output Stage
Low Output Voltage
VLOUT
Output Current Limit
Ilim
Output = ON; TJ < TJ(max)
25
45
70
mA
Output Leakage Current
IOFF
Output = OFF; VOUT = VCC(max)
–
–
10
μA
Output Rise Time
tr
RLOAD = 500 Ω; CLOAD = 10 pF; TA = 25°C
–
0.9
5
μs
Output Fall Time
tf
RLOAD = 500 Ω; CLOAD = 10 pF; TA = 25°C
–
0.5
5
μs
Smax
0
–
8
kHz
f – 3 dB
–
40
–
kHz
–
30
–
%
–
40
–
%
Valley opposite the branded face of package
–
HIGH
–
Tooth opposite the branded face of package
–
LOW
–
–
2
3
–
–
3
Switch Point Characteristics
Tooth Speed
Bandwidth
Operate Point
BOP
Release Point
BRP
Output Polarity
VOUT
% of peak-to-peak, referenced to tooth sensing signal;
AG < AGMax
% of peak-to-peak, referenced to tooth sensing signal;
AG < AGMax
Calibration
Initial Calibration
CI
AGC Disable
Cf
Number of rising mechanical edges on the target that
are required for accurate edge detection
Number of rising mechanical edges on the target that
are required to complete the AGC calibration
3
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
Output Rise Time (tr) and Fall Time (tf)
VOUT (V)
Output High
90%
100%
10%
Output Low
tr
tf
t (s)
Output Voltage Rise Duration
RLOAD = 500 Ω, CLOAD = 10 pF
10.00
VOUT (V)
8.00
6.00
4.00
2.00
0.00
0.0
1.0
2.0
3.0
4.0
5.0
t (μs)
Output Voltage Fall Duration
RLOAD = 500 Ω, CLOAD = 10 pF
10.00
VOUT (V)
8.00
6.00
4.00
2.00
0.00
0.0
1.0
2.0
3.0
4.0
5.0
t (μs)
4
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
OPERATING CHARACTERISTICS using reference target 8X and test circuit #1; air gap within AG range, and over rated ambient
temperature range, unless otherwise noted
Characteristics
Symbol
TICRel
Relative Timing Accuracy*
TRel
Operational Air Gap Range
*Relative
AG
Test Conditions
During initial calibration; rising and falling mechanical
edges; RPM = 1000; gear eccentricity < 0.1 mm
After initial calibration; rising mechanical edge;
RPM = 1000; gear eccentricity < 0.1 mm
After initial calibration; falling mechanical edge;
RPM = 1000; gear eccentricity < 0.1 mm
Output switching: Running mode only
Min.
Typ.
Max.
Units
–
3
6
deg.
–
0.3
0.6
deg.
–
0.5
0.8
deg.
–
0.5
2.5
mm
Timing Accuracy range is the change in edge position over the AG range and the device operating temperature
range.
ICC On, VCC = 4.0 V
10
10
8
8
ICC (mA)
ICC (mA)
ICC Off, VCC = 4.0 V
6
4
6
4
2
2
0
0
-40
25
TA (°C)
150
-40
25
TA (°C)
150
VSAT at ISINK = 15 mA, VCC = 4.0 V
450
VSAT (mV)
375
300
225
150
75
0
-40
25
150
TA (°C)
5
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
Functional Description
POR. (Power-On Reset) Allows complete reset to the original
power-on state, when initial calibration occured, regardless of
the state of the device immediately prior to POR.
needed and minimal processing circuitry is required. This ease
of use should reduce design time and incremental assembly costs
for most applications.
TC. (Temperature Coefficient) This supports fine tuning of the
ATS672 for flat parametric performance over the full rated operating temperature range.
Hall Technology. The device contains a single-chip Hall-effect
IC, a 4-pin leadframe, and a specially-designed rare earth pellet.
The Hall IC possesses a Hall element that measures the magnetic gradient created by the passing of a ferromagnetic object.
The difference in the magnetic gradients created by a tooth and
valley allow the generation of the digital output signal. The
following output diagram corresponds to a customer application
with the standard polarity.
IC Integration. The ATS672 contains a self-calibrating Halleffect IC that possesses temperature compensated amplifier
circuitry and a voltage regulator that provides supply noise rejection over the operating voltage range. The Hall transducer and
the electronics are integrated on the same silicon substrate using
a proprietary BiCMOS process. Changes in temperature do not
greatly affect this device due to the stable amplifier design and
the offset rejection circuitry.
Assembly Description. The ATS672 is integrally molded
into a plastic body that has been optimized for size, ease of
assembly, and manufacturability. High operating temperature
materials are used in all aspects of construction.
Operation. When proper power is applied to the IC, it is
capable of providing digital information that is representative
of the profile of a rotating gear. No additional optimization is
Rare Earth
Pellet
Digital Output Signal
Magnetic Gradient
Ferrous Target
Mechanical Profile
Rare Earth
Pellet
Hall technology. As the target moves by the package, there is a change in the magnetic flux density, B, which is measured in
gauss (G). The left panel shows the effect of a tooth opposite the package, a higher B. The right panel shows the effect of a valley, a lower B.
6
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
Start-Up Detection. The ATS672 generates a digital output
transition when the first rising or falling mechanical edge is
detected after being powered-on, indicating when the first significant motion in the target is detected.
Undervoltage Lockout. When the supply voltage falls below
the minimum operating voltage, VCCUV, the device turns off. It
then stays off, regardless of the state of the magnetic field, until
an operating range VCC is restored. It then turns on again. This
lockout feature prevents false signals, caused by undervoltage
conditions, from propagating to the output of the IC.
Power Supply Protection. The device contains an on-chip
regulator and can operate over a wide VCC range. For devices
that need to operate from an unregulated power supply, transient
protection must be added externally. For applications using a
regulated line, EMI/RFI protection may still be required. Contact
Allegro Microsystems for information on the circuitry needed
for compliance with various EMC specifications.
Automatic Gain Control (AGC). The patented self-calibrating circuitry is unique. Each time the device is powered-on, the
device starts measuring the peak-to-peak magnetic gradient. The
gain of the IC is automatically adjusted, keeping the internal
electrical signal amplitude constant over the air gap range, AG,
of the device. This feature provides consistent operational characteristics independent of variances in the air gap.
Switch Points. Switch points are the levels of magnetic flux
density, B, which trigger switch turn-on and turn-off. When B
exceeds a certain limit, referred to as the Operate point (Bop),
the trigger provides a clean transition from off to on. When the
magnetic field falls below Bop by a certain limit, referred to as
the Release point, Brp, the trigger provides a clean transition
from on to off.
In the ATS672, switch points are established dynamically as a
percentage of the amplitude of the normalized magnetic signal.
Two DACs track the peaks of the normalized magnetic signal,
and the switching thresholds are established at fixed percentages
of the two DAC values. The values of the thresholds have been
carefully selected to provide the most accurate and consistent
switching where the signal is steepest and least affected by air
gap variation.
The figure below graphically demonstrates the establishment of
the switching threshold levels.
The low hysteresis of 10% provides high performance over the
full AG, and immunity to false switching due to noise, vibration,
backlash, or other transient events.
Electrical Signal
Response, with AGC
V
AGMax
AGMin
Valley Signal
AGMin
Magnetic Gradient
(No amplification)
AGMax
Bop
Brp
Bop%
Brp%
100%
Bhys
Tooth Signal
Switch Points. The ATS672 design minimizes hysteresis, Bhys.
t
Ferrous Target
Mechanical Profile
Automatic Gain Control (AGC). The AGC function corrects for
variances in the air gap. Differences in the air gap affect the
magnetic gradient, but AGC prevents that from affecting device
performance.
7
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
Application Information
For additional general application information, visit the Allegro
MicroSystems Web site at www. allegromicro.com.
Target Design
The Hall-effect IC can detect variations in magnetic flux density
generated by features of a target. To distinguish between two
features of a target, such as between a tooth and a valley of a
spur gear, there must be a minimum differential of 120 G in the
magnetic flux densities corresponding to the features, as measured
at the Hall element.
The target must be mounted with an air gap in the range AG, the
distance between the target object and the plane of the Halleffect element as installed. In general, the nearer a target feature
is to the element, the greater the magnetic flux density at the
element.
The following figures and table specify a design that can be used
to construct a reference target. The target represents a ferrous
spur gear, with uniform tooth and valley widths. The target
would be mounted so that its axis of rotation is parallel to the
plane of the Hall-effect element, and centered on the element.
When the target is produced to the specifications listed in the
Reference Target column of the table, the required differential
(tooth peak to valley) in magnetic flux densities is generated.
Also in the table, the Minimum Required for TPOS column
provides specifications for a similar application. These values are
the minimum required for the TPOS function to operate accurately, as defined in the Operating Characteristics table.
Active Area of IC
Target
Branded
face of
Package
8X Reference Target
Reference Target Characteristics
Characteristic
Material
Diameter
Description
Reference
Target 8X
Only
Minimum
Required for
TPOS
Units
Target has uniform composition
CRS1018
–
–
120
–
mm
Symbol
DO
Diameter of target, to valley
Tooth Thickness
F
Breadth of tooth, with respect to branded face of
package
6
5
mm
Tooth Height
Ht
Height of tooth, measured from the valley (DO)
5
5
mm
Tooth Width
T
Width of tooth
22.5*
5
deg.
Valley Width
PC – T
Width of valley, with PC = pitch of teeth
22.5*
13
deg.
*Resulting
arc measures 23.6 mm in length at DO
8
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
Typical Circuit Design
IC/Target Evaluation
The following circuit is the most basic configuration required for
proper device operation. A pull-up resistor is used.
In order to establish the proper operating specification for a
particular IC/target configuration, a systematic evaluation of the
magnetic circuit should be performed. The first step is the generation of a magnetic map of the target. By using a calibrated
device, a magnetic signature of the system is made. A magnetic
map of the 8X reference target, created using the LSB package,
is shown below.
VCC
1
0.1 uF
2
ATS672
3
From this map data, a pair of curves can be derived that describe
the tooth and valley magnetic fields versus air gap. Knowing
the minimum amount of magnetic flux density that guarantees
operation of the IC, one can determine the maximum operational
air gap of the IC/target system.
4
VOUT
Magnetic Map, 8X Reference Target, Using LSB Package
500
Magnetic Flux Density, B (G)
450
400
350
300
250
200
150
100
50
0
-50
-100
-150
-200
0
30
60
90
120
150
180
210
240
270
300
330
360
Position (°)
Magnetic Flux Density, B, Versus Air Gap
8X Reference Target Using LSB Package
Magnetic Flux Density, B (G)
600
500
400
300
200
Tooth
100
0
Valley
-100
-200
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Air Gap (mm)
9
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
DEVICE EVALUATION: ACCURACY
The self-calibration algorithm allows the IC to adapt to system
changes such as air gap increase. However, major changes in air
gap can adversely affect switching performance. When characterizing IC performance over a significant air gap range, be sure
Edge Position vs. Air Gap
Electrical Rising Edge (Mechanical Falling Edge)
ATS672LSB; 8X Reference Target
105
Edge Position (Degrees)
to power-off and then power-on the device at each air gap. This
ensures that self-calibration occurs for each installation condition. See the Operating Characteristics table for information on
timing accuracy performance.
ROOM
150ºC
-40ºC
104.8
104.6
104.4
104.2
104
103.8
103.6
103.4
103.2
103
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
Air Gap (mm)
Edge Position vs. Air Gap
Electrical Falling Edge (Rising Mechanical Edge)
ATS672LSB; 8X Reference Target
Edge Position (Degrees)
127
ROOM
150ºC
-40ºC
126.8
126.6
126.4
126.2
126
125.8
125.6
125.4
125.2
125
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
Air Gap (mm))
Relative Timing Accuracy
Target
Operational Air Gap
Valley
Tooth
Air Gap
Device Output
TAbsRise (Max - Min)
TAbsFall (Max - Min)
10
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
Temperature Compensation
The device should be operated at or below the maximum junction temperature of the device, TJ(max) (see the Absolute Maximum Ratings section, on page 1). The actual operating TJ of the
device is affected by several factors. Under certain combinations
of peak conditions (corresponding to the gray area of the Power
De-Rating Curve chart), operation may require power de-rating
or heat sinking.
The relevent factors are characteristic of the device and package, as well as the application, including the effect of adjacent
external sources of heat. The Package Thermal Resistance, RJA,
indicates the resitance to heat transfer from the heat-generating
portions of the die (the “junction”) through all paths to the ambient air. This includes heat sinking through the PCB, and radiation from the die through the case, RCA. Thermal information
on packages is available on the Allegro Microsystems Web site.
The Allowable Power Dissipation, PD, represents the amount
of power that can be applied to the device at a given RJA and
ambient temperature, TA, without causing the temperature of the
die to exceed TJ(max). This section presents a procedure for correlating these factors with operating voltage, VCC, and operating
current, ICC, to estimate their effect on TJ.
If the estimated operating TJ exceeds TJ(max), then power levels
can be reduced or external heat sinking can be applied. Typically, VCC is the factor reduced, to accommodate the required
TA. A power de-rating curve can be constructed, representing the
maximum allowable VCC per TA.
If the calculated VCC exceeds the power de-rating curve at the
required TA, and heat sinking is not preferred, estimate the
amount to reduce VCC. This can be estimated through calculating PD(max), the maximum allowable PD for the given device and
package. PD(max) is related to RJA and TA. The following formulas represent the fundamental relationships used to calculate the
VCC adjustment, based on the temperature effect, ΔT.
TJ = TA + ΔT
(1)
where T denotes the increase in TJ due to power dissipation
within the device.
T = PD × RJA
(2)
PD = VCC × ICC
(3)
Examples for estimating VCC are provided on the next page.
These formulas and results can also be used to estimate TJ.
For example, given common conditions such as: TA= 25°C,
VCC = 5 V, ICC(on) = 6.5 mA, and RJA = 150 °C/W then:
PD = VCC × ICC(on) = 5 V × 6.5 mA = 32.5 mW

T = PD × RJA = 32.5 mW × 150 °C/W = 4.9°C
TJ = TA + T = 25°C + 4.9°C = 29.9°C
Maximum Allowable VCC (V)
Power De-Rating Curve
VCC(max) = 26.5 V; TJ(max) = 170ºC
28.0
26.0
24.0
22.0
20.0
18.0
16.0
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
Allowable operating range
without additional heat sinking
Some combinations of peak
ratings may require heat sinking
when operating in shaded area
20
40
60
80
100
120
140
160
180
TA (ºC)
11
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
Example: VCC Adjustment, Package SE
Observe the absolute maximum ratings for the package,
specifically:
RJA = 150 °C/W
TJ(max) = 170°C
Also observe the characteristic operating maximums:
VCC(max) = 26.5 V
ICC(max) = 11 mA
For a given TA (e.g., 150°C), first calculate the Maximum Allowable Power Dissipation, PD(max). Invert equation 1:
Tmax = TJ(max) – TA = 170°C – 150°C = 20°C
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
PD(max) = Tmax ÷ RJA = 20°C ÷ 150 °C/W = 133 mW
This provides the corresponding allowable increase in power
level. Finally, invert equation 3 to determine the corresponding
supply voltage VCC:
VCC = PD(max) ÷ ICC(max) = 133 mW ÷ 11 mA = 12 V
The result indicates that the device and package can dissipate
adequate amounts of heat at voltages up to 12 V, at TA = 150ºC.
Because VCC(max) is more than the calculated VCC, however, the
device requires additional heat sinking for operation between the
calculated VCC and VCC(max), under these conditions. If the calculated VCC were greater than or equal to VCC(max), then operation up to VCC(max) would not require additional heat sinking.
PD(max) (m W)
Maxim um Pow er Dissipation
vs. Am bient Temperature
Package SB: RθJA = 150ºC/W, TJ(max) = 170ºC
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
40
60
80
100
120
140
160
180
TA (ºC)
12
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
Package SB, 4-pin SIP
AAD 0.42
13
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ATS672LSB
Self-Calibrating Gear Tooth Sensor IC with 9-Bit Signal Capture
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 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 infringement of patents or other
rights of third parties which may result from its use.
Copyright © 2004-2009 Allegro MicroSystems, Inc.
14
Rev. 1.43
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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