Allegro A1425LK-T High accuracy analog speed sensor with integrated filter capacitor and dual zero-crossing output signal Datasheet

A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor
and Dual Zero-Crossing Output Signal
Package K, 4-pin SIP
The A1425 ac-coupled Hall-effect sensor is a monolithic integrated circuit that
switches in response to changing differential magnetic fields created by rotating
ring magnets and, when coupled with a magnet, by ferrous targets. The device is
a true zero-crossing detector: the output switches precisely when the difference in
magnetic field strength between the two Hall elements is zero. A unique dual-comparator scheme provides for accurate switching at the zero crossing on both the
positive and negative-going regions of the differential signal, while utilizing hysteresis to prevent false switching. The zero-crossing nature of this device provides
excellent repeatability and accuracy for crankshaft applications.
Changes in field strength at the device face, which are induced by a moving
target, are sensed by the two integrated Hall transducers. The transducers generate
signals that are differentially amplified by on-chip electronics. This differential
sensing design provides immunity to radial vibration within the operating air gap
range of the A1425, by rejection of the common mode signal. Steady-state magnet
and system offsets are eliminated using an on-chip differential band-pass filter.
This filter also provides relative immunity to interference from electromagnetic
sources.
The device utilizes advanced temperature compensation for the high-pass filter,
sensitivity, and Schmitt trigger switchpoints, to guarantee optimal operation to low
frequencies over a wide range of air gaps and temperatures.
1
2
3
4
1. VCC
2. VOUT
3. TEST
4. GND
ABSOLUTE MAXIMUM RATINGS
Supply Voltage*, VCC ........................................ 28 V
Reverse-Supply Voltage, VRCC ........................ –18 V
Continuous Output Current, IOUT ...................25 mA
Continuous Reverse-Output Current, IROUT .–50 mA
Operating Temperature
Ambient, TA................................ –40ºC to 150ºC
Maximum Junction, TJ(max)........................165ºC
Storage Temperature, TS .................. –65ºC to 170ºC
*Refer to Power Derating section.
A1425a-DS
Each Hall effect digital integrated circuit includes a voltage regulator, two Hall
effect sensing elements, temperature compensating circuitry, a low-level amplifier,
band-pass filter, Schmitt trigger, and an output driver, which requires a pull-up
resistor. The on-board regulator permits operation with supply voltages from
4.0 to 26.5 V. The output stage can easily switch 20 mA over the full frequency
response range of the sensor, and is compatible with both TTL and CMOS logic
circuits.
The device is packaged in a 4-pin plastic SIP. The lead (Pb) free version (suffix
–T) has a 100% matte tin plated leadframe.
Features and Benefits
•
•
•
•
•
•
•
•
•
•
•
Senses motion of ring magnet or ferrous targets
Integrated filter capacitor
Wide operating temperature range
Operation with magnetic input signal frequency from 20 Hz to 20 kHz
Resistant to EMI
Large effective air gaps
4.0 to 26.5 V supply operating range
Output compatible with both TTL and CMOS logic families
Reverse battery protection
Resistant to mechanical and thermal stress
Accurate true zero crossing switchpoint
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
Product Selection Guide
Part Number
A1425LK-T
Pb-free1
Ambient, TA
(°C)
Yes
–40 to 150
Switchpoints
BRP(MIN)
(G)
BOP(MAX)
(G)
–11
11
Packing2
Bulk, 500
pieces/bag
1Pb-based
variants are being phased out of the product line. These variants are in production
but have been determined to be NOT FOR NEW DESIGN. This classification indicates that
sale of this device is currently restricted to existing customer applications. The device should
not be purchased for new design applications because obsolescence in the near future is
probable. Samples are no longer available. Status change: May 1, 2006. This includes: A1425LK.
2Contact Allegro
for additional packing options
Functional Block Diagram
VS+
VCC
(Pin 1)
TEST
(Pin 3)
Diagnostic
Circuitry
Regulator
Bandpass Filter Integrated
Tracking Capacitor
Dual Hall
Transducers
VOUT
(Pin 2)
Comparator
0.1 uF
Hall
Amp
Gain
Stage
VREF
GND
(Pin 4)
A1425-DS
(Required)
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
OPERATING CHARACTERISTICS Valid at TA = – 40ºC to 150ºC, TJ ≤ 165°C; over operational air gap range and VCC within
operating range, unless otherwise noted. Typical operating parameters: VCC = 12 V and TA = 25°C.
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
4.0
–
26.5
V
–
4.2
7.0
mA
–
140
400
mV
–
–
5
μA
VCC = –18 V
–
–
–1
mA
ELECTRICAL CHARACTERISTICS
Supply Voltage
VCC
Supply Current
ICC
Output Saturation Voltage
Output Leakage Current
Operating; TJ < TJ(max)
VOUT(SAT) ISINK = 20 mA
IOFF
VOUT = 24 V, Bdiff = 0
PROTECTION COMPONENT CHARACTERISTICS
Reverse Supply Current
IRCC
Supply Zener Current
IZSupply
VS = 28 V
–
–
10
mA
Supply Zener Clamp Voltage1
VZSupply
ICC = 10 mA, TA = 25°C
28
33
37
V
Output Zener Current
IZOutput
VOUT = 28 V
–
–
3
mA
Output Zener Clamp Voltage
VZOutput
IOUT = 3 mA, TA = 25°C
28
–
–
V
Output Short Circuit Current Limit2
IOUTS(lim)
–
–
50
mA
t < tResponse
–
High
–
V
tPO
VCC > VCC(min)
–
4.5
9
ms
tSettle
fBdiff ≥ 100 Hz
0
–
50
ms
RESPONSE CHARACTERISTICS
Power-On State
Power-On Time3,7
Settling Time4,7
Response
Time7
POS
4.5
–
59
ms
Upper Corner Frequency
tResponse Equal to tPO + tS; fBdiff ≥ 100 Hz
fcu
–3 dB, single pole
20
–
–
kHz
Lower Corner Frequency
fcl
–3 dB, single pole
–
–
20
Hz
Output Rise Time5
tr
RPU = 1 kΩ, COUT2 = 10 pF
–
–
200
ns
Output Fall Time
tf
RPU = 1 kΩ, ISINK = 20 mA, COUT2 = 10 pF
–
–
200
ns
–11
0
11
G
–11
0
11
G
50
–
1250
G
OUTPUT CHARACTERISTICS
MAGNETIC CHARACTERISTICS
Output Off Switchpoint6,7
BOP
Output On Switchpoint6,7
BRP
Applied Magnetic Field7,8
Bdiff
Bdiff increasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p;
digital output signal switches low to high
Bdiff decreasing, fBdiff = 200 Hz, Bdiff = 50 Gp-p;
digital output signal switches high to low
Differential p-p magnetic field
1I
CC equivalent to ICC(max) + 3 mA.
2I
OUT does not change state when IOUT > IOUTS(lim) , regardless of changes in the sensed magnetic field..
3Time required to initialize device.
4Time required for the output switchpoints to be within specification.
5Output Rise Time will be dominated by the RC time constant.
6For other sinusoidal signal frequencies and magnetic fields, –B
OP = BRP = sinα(Bdiff ⁄ 2) ± 25%, where α is the phase shift shown in the Characteristic
Data section.
7See Definitions of Terms section.
8Exceeding the maximum magnetic field may result in compromised absolute accuracy.
3
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions
RθJA
Package Thermal Resistance
Single-layer PCB, with copper limited to solder pads
177
ºC/W
Maximum Power Dissipation, PD(max)
Power Derating Curve
30
900
28
850
VCC(max)
26
800
750
24
700
22
650
20
18
16
(RθJA = 177 ºC/W)
14
12
10
8
6
VCC(min)
4
2
Power Dissipation, PD (m W)
Maximum Allowable VCC (V)
Rating Units
600
(R
θJ
550
A
500
450
400
=
17
7
ºC
/W
)
350
300
250
200
150
100
50
0
0
20
40
60
80
100
120
140
160
180
Temperature (ºC)
20
40
60
80
100
120
140
160
180
Temperature (°C)
Definitions of Terms
The following provide additional information about some of
the parameters cited in the Operating Characteristics table.
For additional information, visit the Allegro Web site at
www.allegromicro.com.
Applied Magnetic Field, Bdiff – The differential magnetic flux
density which is calculated as the arithmetic difference of the
flux densities observed by each of the two Hall elements.
Output Off Switchpoint (Operate Point), BOP – The value of
increasing differential magnetic flux density at which the device
output switches from low to high. This value may be greater than
or less than 0 G.
Output On Switchpoint (Release Point), BRP – The value of
decreasing differential magnetic flux density at which the device
output switches from high to low. This value may be greater
than or less than 0 G.
Power-On Time, tPO – The time needed by the device, after
power is applied, to initialize all circuitry necessary for proper
operation.
Settling Time, tSettle – The time required by the device, after tPO,
and after a valid magnetic signal has been applied, to provide
proper output transitions. Settling time is a function of magnetic
offset, offset polarity, signal phase, signal frequency, and signal
amplitude.
Response Time tResponse – The total time required for generating zero-crossing output transitions after power-up (the sum of
power-on time and settling time).
4
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
Empirical Results
Output Voltage by Ambient Temperature
Supply Current by Ambient Temperature
7
VCC (V)
6
ICC (mA)
5
VOUT(SAT) (mV)
4.5
12
12.0
26
20.0
4
3
2
1
0
–50
0
50
100
150
200
500
450
400
350
300
250
200
150
100
50
0
–50
ISINK = 20 mA
VCC (V)
4.5
12.0
20.0
0
Supply Current by Supply Voltage
7
ICC (mA)
5
VOUT(SAT) (mV)
150
25
–40
4
3
2
1
10
20
VCC (V)
150
200
Output Voltage by Supply Voltage
TA (ºC)
6
0
100
TA (ºC)
TA (ºC)
0
50
30
500
450
400
350
300
250
200
150
100
50
0
0
ISINK = 20 mA
TA (ºC)
150
25
–40
5
10
15
20
25
VCC (V)
Continued on next page.
5
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
Empirical Results, continued
Repeatability (º of Rotation)
116
Air Gap (mm)
Repeatability (º of Rotation)
116
Air Gap (mm)
6
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
Simulation Results
A1425 Minimum Switching Fields
Over the Range of Ambient Operating Temperatures, TA
fBdiff(low) = 15 Hz, fBdiff(high) ≈ 30 kHz
40
35
30
25
Bdiff(min) (G)
25
150
20
–40
15
10
5
0
0.01
0.1
1
10
40
Frequency, fBdiff (kHz)
A1425 Typical Phase Shift
Over the Range of Applied Magnetic Fields, Bdiff
fBdiff(low) = 15 Hz, fBdiff(high) = 30 kHz
40
30
50
100
500
10 750
Phase Shift (º)
20
0
–10
1250
Bdiff in Gp-p
–20
–30
–40
–50
–60
0.01
0.1
Frequency, fBdiff
1
(kHz)
10
40
Continued on next page.
7
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
Simulation Results, continued
A1425 Typical Delay
Over the Range of Applied Magnetic Fields, Bdiff
fBdiff(low) = 15 Hz, fBdiff(high) = 30 kHz
15
10
Bdiff in Gp-p
50
75
–10
50
100
12
–5
50
IOUT Lagging
0
0
5
0
IOUT Delay (μs)
IOUT Leading
20
–15
–20
0.1
1
Frequency, fBdiff (kHz)
40
10
Positive values of delay indicate a lagging output, while negative values indicate a leading output.
IOUT Delay (μs)
IOUT Leading
A1425 Typical Delay
Over the Range of Applied Magnetic Fields, Bdiff
fBdiff(low) = 15 Hz, fBdiff(high) = 30 kHz
1000
0
–1000
1250
750
500
–2000
IOUT Lagging
–3000
Bdiff in Gp-p
–4000
10
–5000
0
50
–6000
0
100
Frequency, fBdiff (Hz)
Positive values of delay indicate a lagging output, while negative values indicate a leading output.
8
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
Sensor Evaluation: EMC Characterization
Please contact Allegro MicroSystems for EMC performance information.
Test Name
Reference Specification
ESD – Human Body Model*
AEC-Q100-002
ESD – Machine Model*
AEC-Q100-003
Conducted Transients
ISO 7637-1
Direct RF Injection
ISO 11452-7
Bulk Current Injection
ISO 11452-4
TEM Cell
ISO 11452-3
*ESD testing is performed with no external components.
Vs
R1
C1
1
RPU
VCC
4
GND
1425
VOUT
2
COUT2
TEST
3
(Required)
Recommended EMC test circuit.
Component
RPUa
R1b
C1
COUT2c
Value
1.2
100
0.1
4.7
Units
kΩ
Ω
μF
nF
aPull-up resistor not required for protection but for normal operation.
bFor improved CI performance
cFor improved BCI performance
9
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
Functional Description
The A1425 is a versatile high-precision differential sensing
device that can be used in a wide range of applications. Proper
choice of the target material and shape, and assembly techniques
enables large working air gaps and high switchpoint accuracy
over the device operating temperature range.
Start-up
Sensor Operation
Also during tPO, a circuit in the A1425 is briefly enabled that
charges the on-chip capacitor. This feature reduces tPO, relative
to the long RC time constant of a high-pass filter.
During power-on time, tPO, the output signal, VOUT, is high.
Beyond this time, if the applied magnetic field, Bdiff, is absent or
less than 50 G peak-to-peak, the switching state and VOUT polarity are indeterminate. VOUT will be valid for Bdiff > 50 Gp-p,
after the additional settling time, tSettle, has also elapsed.
The A1425 sensor IC contains two integrated Hall transducers
that are used to differentially sense a magnetic field across the
surface of the IC. Referring to figure 1, the trigger switches the
output off (output high) when the differential magnetic field
crosses zero while increasing in strength (referred to as the positive direction), and switches the output on (output low) when
the differential magnetic field crosses zero while decreasing (the
negative direction).
Delay
The on-chip band-pass filter induces delay in the output signal,
VOUT, relative to the applied magnetic field, Bdiff. Simulation
data shown in the Characteristic Data section quantify the effect
of the input signal amplitude on the phase shift of the output.
AC-Coupled Operation
The operation is achieved through the use of two separate
comparators. Both comparators use the same reference point, 0
G, to provide high accuracy, but one comparator has a positive
hysteresis, BHYS1, and the other a negative hysteresis, BHYS2.
Therefore, one comparator switches (BOP) at the zero crossing on
an increasing differential signal and the other switches (BRP) at
the zero crossing on a decreasing differential signal. The hysteresis on each comparator precludes false switching on noise or
target jitter.
Steady-state magnet and system offsets are eliminated using an
on-chip differential band-pass filter. The low and high frequency
poles of this band-pass filter are set using internal integrated
capacitors and resistors. The differential structure of this filter
improves the ability of the IC to reject single-ended noise on
the ground (GND pin) or supply line (VCC pin) and, as a result,
makes it more resistant to electromagnetic interference typically
seen in hostile remote-sensing environments.
11.0
Applied Magnetic
Field, Bdiff
BOP(typ)
0.0
A
–11.0
BOP(max) / BRP(max)
BHYS1 A
BRP(typ)
BHYS2
BOP(min) / BRP(min)
Comparator 1
Comparator 2
Switching State
Output Signal, VOUT
Off
On
Off
t+
Figure 1. Typical output characteristics with dual comparator operation. Characteristics shown without delay, see characteristic
data charts for delay and phase shift contributions.
10
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
Applications Information
Target Selection
Power Supply Protection
The zero-crossing switchpoints and ac-coupled operation of this
device make target selection important. For high-density target
geometries or small target features that produce a sinusoidal
magnetic signal, the high-pass filter is capable of filtering offsets
that may be induced in the final sensor output. If such offset is
present, and the target has larger features, then the high-pass
filter may not be effective at higher speeds and an accuracy shift
may occur. These relationships are shown in figure 2.
The A1425 contains an on-chip voltage regulator and can operate over a wide supply voltage range. In applications that operate
the device from an unregulated power supply, transient protection must be added externally. For applications using a regulated
line, EMI/RFI protection may still be required. The circuit
shown in figure 3 is the most basic configuration required for
proper device operation.
Differential Magnetic
Flux Density, Bdiff
Large Feature (Tooth)
Valley
+B
(a)
0
–B
Differential Magnetic
Flux Density, Bdiff
Device Output
Voltage, VOUT
+V
VCC
1
RPU
0.1 uF
0
+B
t
4
A1425
2
VOUT
3
Output Edge
Shift
(Required)
(b)
0
Figure 3. Basic application circuit. A pull-up resistor, RPU, is
required with the output driver.
–B
Device Output
Voltage, VOUT
+V
0
t
Figure 2. Large Feature Effects. (a) Large target feature but no sensor offset,
normal edge position. (b) Large target feature with sensor offset, shifted
(advanced) output edge position.
11
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
Power Derating
The device must be operated below the maximum junction
temperature of the device, TJ(max). Under certain combinations of
peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating TJ. (Thermal data is also available on
the Allegro MicroSystems Web site.)
The Package Thermal Resistance, RθJA, is a figure of merit summarizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, RθJC, is
relatively small component of RθJA. Ambient air temperature,
TA, and air motion are significant external factors, damped by
overmolding.
The effect of varying power levels (Power Dissipation, PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
PD = VIN × IIN
(1)
ΔT = PD × RθJA
(2)
TJ = TA + ΔT
(3)
For example, given common conditions such as: TA= 25°C,
VCC = 5.0 V, ICC = 4.2 mA, and RθJA = 177 °C/W, then:
PD = VCC × ICC = 5.0 V × 4.2 mA = 21.0 mW
ΔT = PD × RθJA = 21.0 mW × 177 °C/W = 3.7°C
TJ = TA + ΔT = 25°C + 3.7°C = 28.7°C
A worst-case estimate, PD(max), represents the maximum allowable power level (VCC(max), ICC(max)), without exceeding TJ(max),
at a selected RθJA and TA.
Example
Reliability for VCC at TA = 150°C, using minimum-K PCB
Observe the worst-case ratings for the device, specifically:
RθJA = 177°C/W, TJ(max) = 165°C, VCC(max) = 26.5 V, and
ICC(max) = 7.0 mA.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
ΔTmax = TJ(max) – TA = 165 °C – 150 °C = 15 °C
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
PD(max) = ΔTmax ÷ RθJA = 15°C ÷ 177 °C/W = 84 mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max) = 84 mW ÷ 7.0 mA = 12 V
The result indicates that, at TA, the application and device can
dissipate adequate amounts of heat at voltages ≤VCC(est).
Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reliable operation between VCC(est) and VCC(max) requires enhanced
RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and
VCC(max) is reliable under these conditions.
For example, when a standard diode with a 0.7 V drop is used:
VS(max) = 12 V + 0.7 V = 12.7 V
12
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1425
High Accuracy Analog Speed Sensor with Integrated Filter Capacitor and Dual Zero-Crossing Output Signal
Package K, 4-pin SIP
.208 5.28
.203 5.16
.0866 2.20
NOM
.0592 1.50
NOM
.138 3.51
.133 3.38
C
.063 1.60
.059 1.50
.0507 1.29
NOM
B
E1
E2
A
.045 1.14
MIN
.033 0.84
NOM
.021 0.53
MAX
.085 2.16
MAX
.600 15.24
.560 14.23
.017 0.44
.014 0.35
1
.019
.014
0.48
0.36
2
3
4
.050 1.27
NOM
Dimensions in inches
Millimeters in brackets, for reference only
Case dimensions exclusive of mold flash or gate burrs
Mold flash .010 [0.25] MAX, gate burr .008 [0.20] MAX, dambar protrusion .004 [0.10] MAX
Exact case and lead configuration at supplier discretion within limits shown
A Dambar removal protrusion (8X)
B Ejector mark on opposite side
C
Active Area Depth .0165 [0.42] NOM
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 © 2005 Allegro MicroSystems, Inc.
13
A1425-DS
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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