ATS610LSC: Dynamic, Peak-Detecting, Differential Hall-Effect Gear-Tooth Sensor ICs

ATS610LSA and ATS611LSB
Dynamic Peak-Detecting Differential
Hall Effect Gear Tooth Sensor ICs
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:
For new applications, refer to the Allegro ATS617.
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.
Data Sheet
27627.100a
ATS610LSA AND
ATS611LSB
DYNAMIC, PEAK-DETECTING, DIFFERENTIAL
HALL
EFFECT GEAR-TOOTH
SENSOR
HALL-EFFECT
GEAR-TOOTH SENSOR
ICSICS
2
4
The ATS610LSA and ATS611LSB gear-tooth sensor ICs are optipackages
mized Hall IC plus rare earth pellet
devices providing a user-friendly solupackage
tion for digital gear-tooth sensing applications. Each device
combines
in a compact high-temperature plastic package, a samarium-cobalt pellet, a
pole piece, and a differential Hall-effect IC that has been optimized to
the magnetic circuit. These devices can be easily used in conjunction
with a wide variety of gear or target shapes and sizes.
1
3
The ATS610LSA is designed to provide increased immunity to
false switching in applications that require the sensing of large-tooth
gears (e.g., crank angle or cam angle). The ATS611LSB is optimized
to sense fine-pitch gears over large working air gaps (e.g., transmission or ABS). These devices are ideal for use in gathering speed,
position, and timing information using gear-tooth-based configurations.
Pin 1 = Supply
Pin 2 = Output
Pin 3 = Capacitor
Pin 4 = Ground
The technology used for these IC plus rare earth pellet
Dwg. AH-006
devices is Hall-effect based. The IC incorporates a dual-element
packages
Hall IC that switches in response to differential magnetic signals
created by the ferrous target. The circuitry contains a patented
track-and-hold peak-detecting circuit to eliminate magnet and system
offset effects. This circuit has the ability to detect relatively fast changes,
such as those caused by gear wobble and eccentricities, and provides
stable operation at extremely low rotation speeds.
ABSOLUTE MAXIMUM RATINGS
over operating temperature range
Supply Voltage, V CC .........................
16 V*
Reverse Supply Voltage, V RCC ....... -0.5 V
Output OFF Voltage, V OUT ................. 18 V
Reverse Output Voltage, V OUT ....... -0.5 V
Continuous Output Current, I OUT ... 25 mA
Minimum External Capacitance,
C 3 .............................................
0.1 µF
Package Power Dissipation,
See Graph
P D ....................................
Operating Temperature Range,
-40°C to +150°C*
T A ...........................
Storage Temperature, T S ............ +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.
continued next page…
FEATURES AND BENEFITS
■
■
■
■
■
■
■
■
■
■
Fully Optimized Differential Digital Gear-Tooth Sensor IC
Single-Chip Sensing IC for High Reliability
Extremely Low Timing Accuracy Drift with Temperature
Large Operating Air Gaps
Small Mechanical Size
Optimized Magnetic Circuit
Patented Peak-Detecting Filter:
<200 µs Power-On Time
<10 RPM Operation (single-tooth target)
Correct First-Edge Detection
Uses Small Value Ceramic Capacitors
Under-Voltage Lockout
Wide Operating Voltage Range
Defined Power-Up State
Always order by complete part number, e.g.,
ATS610LSA .
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
ATS610LSA: Large-tooth, gear-position sensing —
crank angle, cam angle.
ATS611LSB: Fine-pitch, large air gap, gear-speed
sensing — transmission, ABS.
1000
ALLOWABLE PACKAGE POWER DISSIPATION IN mW
Both devices are packaged in miniature plastic
housings that have been optimized for size, ease of assembly,
and manufacturability. High operating temperature materials are used in all aspects of construction. Devices for
operation at increased temperatures are also available on
special order.
800
"SA" PACKAGE
R θJA = 147 °C/W
"SB" PACKAGE
R θJA ~ 150 °C/W
600
400
200
0
20
40
80
120
60
100
140
AMBIENT TEMPERATURE IN ° C°
FUNCTIONAL BLOCK DIAGRAM
1
SUPPLY
REG
POWER-ON
LOGIC
UVLO
OUTPUT
X
E1
MAGNET
X
E2
+
–
TRACK &
HOLD
+
–
4
GROUND
3
CAPACITOR
2
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
W
Copyright © 2003 Allegro MicroSystems, Inc.
Dwg. FH-014
160
180
Dwg. GH-065
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
ELECTRICAL CHARACTERISTICS over operating voltage and temperature range,
C3 = 0.1 µF to 0.47 µF.
Limits
Characteristic
Symbol
Supply Voltage
V CC
Power-On State
POS
Under-Voltage Lockout
V
Operating, T J < 165 °C
V
Lockout (V
CC(hys)
Output Saturation Voltage
V
OUT(SAT)
Supply Current
=0 → 5V
I OUT = 20 mA, V
V
I
CC
CC(UV)
Under-Voltage Hysteresis
Output Leakage Current
Test Conditions
CC(UV)
CC
=0 →5V
) – Shutdown
Min.
Typ.
Max.
Units
V CC(UV)
–
16
V
HIGH
HIGH
HIGH
–
2.5
–
3.5
V
–
0.1
–
V
I OUT = 20 mA
–
90
400
mV
OFF
V OUT = 16 V
–
0.2
15
µA
I CC
Output OFF
5.5
7.7
11
mA
Output ON
8.5
10.5
13
mA
–
–
200
µs
Power-On Delay
ton
Output Rise Time
tr
R L = 500 Ω, C L = 10 pF
–
0.2
2.0
µs
Output Fall Time
tf
R L = 500 Ω, C L = 10 pF
–
0.2
2.0
µs
NOTE: Typical data is at V
CC
www.allegromicro.com
= 5 V and T
A
= +25 °C and is for design information only.
3
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
ATS610LSA OPERATION over operating voltage and temperature range with reference target
(unless otherwise specified).
Limits
Characteristic
Symbol
Air Gap Range
AG
Minimum Air Gap
AG
Maximum Air Gap
AG
Timing Accuracy
min
max
tθ
Test Conditions
Min.
Typ.
Max.
Units
Operating,
Target Speed > 20 RPM
0.4
–
2.25
mm
Operating, One-Tooth (180 °)
Target, Target Speed = 1000 RPM
–
0.25
–
mm
Operating, One-Tooth (180 °)
Target, Target Speed = 1000 RPM
–
2.75
–
mm
Target Speed = 1000 RPM,
0.4 mm ≤ AG ≤ 2 mm
–
±0.5
±1.0
°
ATS611LSB OPERATION over operating voltage and temperature range with reference target
(unless otherwise specified).
Limits
Characteristic
Symbol
Air Gap Range
AG
Minimum Air Gap
AG
Maximum Air Gap
AG
Timing Accuracy
min
max
tθ
Test Conditions
Min.
Typ.
Max.
Units
Operating,
Target Speed > 20 RPM
0.4
–
2.5
mm
Operating, One-Tooth (180 °)
Target*, Target Speed = 1000 RPM
–
0.75
–
mm
Operating, One-Tooth (180 °)
Target*, Target Speed = 1000 RPM
–
3.25
–
mm
Target Speed = 1000 RPM,
0.4 mm ≤ AG ≤ 2 mm
–
±0.5
* The one-tooth (180 °) target is not recommended for use with the ATS611LSB.
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
±1.0
°
h
t =5
m
m
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
D o= 115 mm
TARGET
≥ 3 mm
F (THICKNESS)
3m
T=
3m
m
m
E1
REFERENCE TARGET
AIR GAP
E2
IC
POLE PIECE
SOUTH
RARE EARTH
PELLET
NORTH
1
2
3
4
Dwg. MH-016 mm
D o= 115 mm
TARGET
T = 180 °
(ONE TOOTH)
E1
=5
ht
≥ 3 mm
F (THICKNESS)
E2
mm
AIR GAP
ONE-TOOTH (180°) TARGET
IC
POLE PIECE
SOUTH
RARE EARTH
PELLET
NORTH
1
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2
3
4
Dwg. MH-016-1 mm
5
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
TYPICAL ATS610LSA AND ATS611LSB ELECTRICAL CHARACTERISTICS
14
13
12
12
11
SUPPLY CURRENT IN mA
SUPPLY CURRENT IN mA
11
OUTPUT ON
10
9.0
V =5V
CC
8.0
7.0
OUTPUT OFF
OUTPUT ON
10
9.0
8.0
OUTPUT OFF
7.0
T
6.0
A
= 25 °C
6.0
4.0
0
-40
40
80
120
160
5.0
200
2.0
AMBIENT TEMPERATURE IN ° C°
6.0
10
14
18
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-058
Dwg. GH-014-1
175
150
125
I
OUT
OUTPUT SATURATION VOLTAGE IN mV
OUTPUT SATURATION VOLTAGE IN mV
150
= 20 mA
100
75
50
-40
0
40
80
120
160
200
125
100
75
T
= 25 °C
50
25
0
0
10
20
30
40
OUTPUT SINK CURRENT IN mA
AMBIENT TEMPERATURE IN °C°
Dwg. GH-013-1
6
A
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Dwg. GH-059
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
TYPICAL ATS610LSA OPERATING CHARACTERISTICS
(with reference target)
3.0
3.0
LEADING TARGET EDGE
2.5
RELATIVE ACCURACY IN DEGREES
-40 °C
+25°C
+150 °C
2.0
1.5
1.0
0.5
0
0
0.5
1.0
1.5
2.5
2.0
-40 °C
+25°C
+150 °C
2.0
1.5
1.0
0.5
0
3.5
3.0
AIR GAP IN MILLIMETERS
0
0.5
1.0
1.5
2.0
AIR GAP IN MILLIMETERS
Dwg. GH-008
2.5
3.0
3.5
Dwg. GH-008-2
53.0
52.8
DUTY CYCLE IN PER CENT
RELATIVE ACCURACY IN DEGREES
TRAILING TARGET EDGE
2.5
-40 °C
+25°C
+150 °C
52.6
52.4
52.2
52.0
51.8
51.6
51.4
0
0.5
1.0
1.5
2.0
AIR GAP IN MILLIMETERS
2.5
3.0
3.5
Dwg. GH-008-1
continued next page…
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7
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
4.5
4.5
4.0
4.0
MAXIMUM AIR GAP IN MILLIMETERS
MAXIMUM AIR GAP IN MILLIMETERS
TYPICAL ATS610LSA OPERATING CHARACTERISTICS
(with reference target) — Continued
3.5
3.0
2.5
-40 °C
+25°C
+150 °C
2.0
1.5
1.0
0
10
20
30
50
40
REFERENCE TARGET SPEED IN RPM
3.0
2.5
-40 °C
+25°C
+150 °C
2.0
1.5
1.0
70
60
3.5
0
500
1000
1500
Dwg. GH-011-1
TYPICAL ATS611LSB OPERATING CHARACTERISTICS
(with reference target)
4.5
MAXIMUM AIR GAP IN MILLIMETERS
4.0
3.5
3.0
2.5
-40 °C
+25°C
+150 °C
2.0
1.5
1.0
0
500
1000
1500
2000
2500
REFERENCE TARGET SPEED IN RPM
8
2000
2500
REFERENCE TARGET SPEED IN RPM
3000
3500
Dwg. GH-011-2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3000
3500
Dwg. GH-011
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
DEVICE DESCRIPTION
The application of these devices is uncomplicated.
After power is applied to the device, they are capable of
quickly providing digital information that is representative
of a rotating gear or specially designed target. No additional optimization or processing circuitry is required. This
ease of use should reduce design time and incremental
assembly costs for most applications.
Hall Technology.
Both ATS61x packages
contain 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 2.235
mm (0.088") apart, which sense the magnetic gradient
created by the passing of a ferrous object (a gear tooth).
The two Hall voltages are compared and the difference is
then processed to provide a digital output signal.
The processing circuit uses a patented peak-detection
technique to eliminate magnet and system offsets. This
technique allows coupling and filtering of offsets without
the power-up and settling time disadvantages of classical
high-pass filtering schemes. Here, the peak signal of
every tooth and valley is detected and is used to provide
an instant reference for the operate-point and releasepoint comparators. In this manner, the thresholds are
adapted and referenced to individual signal peaks and
valleys, thereby providing immunity to zero-line variation
due to installation inaccuracies (tilt, rotation, and
off-center placement), as well as for variations caused by
target and shaft eccentricities. The peak detection
concept also allows extremely low-speed operation when
used with small-value capacitors.
DIFFERENTIAL
MAGNETIC FLUX
OPERATE
OPERATE
0
RELEASE
RELEASE
V
BB
OUTPUT
The ATS610LSA and ATS611LSB dynamic,
peak-detecting, differential Hall-effect gear-tooth sensor ICs
are Hall IC plus pellet devices that are fully optimized
to provide digital detection of gear-tooth edges in a small
package size. Both devices are packaged in identical
miniature plastic housings that have been optimized for
size, ease of assembly, and manufacturability.
High operating temperature materials are used in all aspects of
construction.
V
OUT(SAT)
Dwg. WH-011
Power-On Operation. The device will power on in the
OFF state (output high) irrespective of the magnetic field
condition. The power-on time of the circuit is no greater
than 200 µs. The circuit is then ready to accurately detect
the first target edge that results in a HIGH-to-LOW transition.
Under-Voltage Lockout. When the supply voltage is
below the minimum operating voltage (V CC(UV) ), the device
is OFF and stays OFF irrespective of the state of the
magnetic field. This prevents false signals, which may be
caused by under-voltage conditions (especially during turn
on), from appearing at the output.
Output. The device output is an open-collector stage
capable of sinking 25 mA. An external pull-up (resistor) to
a supply voltage of not more than 18 V must be supplied.
Superior Performance. The ATS610LSA and
ATS611LSB peak-detecting differential gear-tooth sensor ICs have several advantages over conventional
Hall-effect gear-tooth sensors.
continued next page…
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9
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
DEVICE DESCRIPTION — Continued
Differential vs. Single-Element Design. The differential Hall-element configuration is superior in most applications to the classical single-element gear-tooth sensor.
The single-element configuration commonly used
(Hall-effect sensor mounted on the face of a simple
permanent magnet) requires the detection of a small
signal (often <100 G) that is superimposed on a large
back-biased field, often 1500 G to 3500 G. For most
gear/target configurations, the back-biased field values
change due to concentration effects, resulting in a varying
baseline with air gap, with valley widths, with eccentricities, and with vibration. The differential configuration
cancels the effects of the back-biased field and avoids
many of the issues presented by the single Hall element.
perform properly after the filter has been allowed to settle,
which is typically greater than one second. Also, highpass filter solutions cannot easily track rapidly changing
baselines such as those caused by eccentricities. Peak
detection switches on the change in slope of the signal
and is baseline independent at power up and during
running.
Track-and-Hold Peak Detecting vs. Zero-Crossing
Reference. The usual differential zero-crossing sensors
are susceptible to false switching due to off-center and
tilted installations, which result in a shift in baseline that
changes with air gap. The track-and-hold peak-detection
technique ignores baseline shifts versus air gaps and
provides increased immunity to false switching. In addition, using track-and-hold peak-detecting techniques,
increased air gap capabilities can be expected because a
peak detector utilizes the entire peak-to-peak signal range
as compared to zero-crossing detectors that switch on
fixed thresholds.
NOTE — 10 G = 1 mT, exactly.
Peak-Detecting vs. AC-Coupled Filters. High-pass
filtering (normal AC coupling) is a commonly used technique for eliminating circuit offsets. AC coupling has
errors at power up because the filter circuit needs to hold
the circuit zero value even though the circuit may power
up over a large signal. Such filter techniques can only
T
TARGET
= 25 °C
A
DIFFERENTIAL MAGNETIC FIELD IN GAUSS
SINGLE ELEMENT MAGNETIC FIELD IN GAUSS
TARGET
NOTE — “Baseline” refers to the zero-gauss differential where each Hall-effect element is subject to the
same magnetic field strength.
-2000
-2500
AIR GAP = 2.5 mm
AIR GAP = 2.0 mm
-3000
AIR GAP = 1.5 mm
-3500
AIR GAP = 1.0 mm
-4000
AIR GAP = 0.5 mm
-4500
-5000
0
10
20
30
40
50
60
ANGLE OF TARGET ROTATION IN DEGREES
T
= 25 °C
A
1500
AIR GAP = 0.5 mm
1000
AIR GAP = 1.0 mm
500
0
AIR GAP = 2.5 mm
AIR GAP = 2.0 mm
AIR GAP = 1.5 mm
-500
-1000
-1500
0
10
20
30
40
Dwg. GH-061-1
Single-element flux maps
showing the impact of varying valley widths
10
50
60
ANGLE OF TARGET ROTATION IN DEGREES
Dwg. GH-061
Differential flux maps vs. air gaps
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
APPLICATIONS INFORMATION
non-uniformities in the gear or target. For applications
that require the sensing of a target with a repetitive target
structure (valley width less than 5 mm), the optimal
choice is the ATS611LSB. Here, the lower switching
thresholds make the device more sensitive to magnetic
field changes and will provide larger operating air gaps.
Operation with Fine-Pitch Gears. For targets with a
circular pitch of less than 4 mm, 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.
2.235 COS α
Gear Diameter and Pitch. Signal frequency is a direct
function of gear pitch and rotational speed (RPM). The
width of the magnetic signal in degrees and, hence, the
signal slope created by the tooth is directly proportional to
the circumference of the gear ( πD o). Smaller diameters
limit the low-speed operation due to the slower rate of
change of the magnetic signal per degree of gear rotation
(here the limitation is the droop of the capacitor versus the
signal change). Larger diameters limit high-speed operation due to the higher rate of change of magnetic signal
per degree of rotation (here the limitation is the maximum
charge rate of the capacitor versus the rate of signal
change). These devices are optimized for a 50 mm gear
diameter (signal not limited by tooth width), 0.33 µF
capacitor, and speeds of 10 RPM to 8000 RPM. For very
large diameter gears (diameter >200 mm), the devices
must be configured with a lower value capacitor, but not
less than 0.1 µF. This allows for a range of 5:1 in gear
diameters.
2.235
α
Air Gap and Tooth Geometry. Operating specifications
are impacted by tooth width (T), valley width (p c - T) and
depth (h t), gear material, and gear face thickness (F). The
target can be a gear or a specially cut shaft-mounted tone
wheel made of stamped ferrous metal. In general, the
following gear or target guidelines must be followed to
achieve greater than 2 mm air gap from the face of unit:
Tooth width, T .............................. >2 mm
Valley width, p c - T ...................... >2 mm
(Whole) depth, h t ......................... >3 mm
Gear material ............................... low-carbon steel
Gear face width (thickness), F .... >3 mm
Deviation from these guidelines will result in a reduction of air gap and a deterioration in timing accuracy. For
applications that require the sensing of large-tooth targets,
the optimal choice is the ATS610LSA. Here, the
higher switching thresholds provide increased immunity to
false switching caused by magnetic overshoot and other
TARGET FACE WIDTH, F
>2.235 SIN α
A
A
NOTE — In application, the terms “gear” and “target” are
often interchanged. However, “gear” is preferred when
motion is transferred.
Dwg. MH-018-1 mm
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). The
slope of this magnetic profile also changes with air gap,
resulting in timing accuracy shift with air gap (refer to
typical operating characteristic curves). Valley-to-tooth
transitions will generally provide better accuracy than
tooth-to-valley transitions for large-tooth or large-valley
configurations. For highest accuracy, targets greater than
100 mm in diameter should be used.
continued next page…
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11
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
APPLICATIONS INFORMATION — Continued
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 of the device. For
nonrepetitive target structures, there will be a small but
measureable change in pulse width versus air gap.
Output Polarity. The output of the device will switch from
HIGH to LOW as the leading edge of the target passes
the module in the direction indicated below (pin 4 to pin
1), which means that the output 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
LOW to HIGH as the leading edge of the target passes
the module, which means that the output will be HIGH
when the unit is facing a tooth.
2
4
1
3
4
3
2
Dwg. AH-007
1
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 3.5 V and 16 V. 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 low-pass
circuit (R 1 C 1 ) on the supply line and an optional output
capacitor (C 2 ) is recommended for operation in noisy
environments. Because the device has an open-collector
output, an output pull-up resistor (R L ) must be included
either at the device output (pin 2) or by the signal processor input.
SUPPLY
OUTPUT
C2
100 pF
RL
Dwg. AH-006-1
Power Supply Protection. The devices contain an onchip voltage regulator and can operate over a wide supply
voltage range. For devices that need to operate from an
unregulated power supply, transient and double-battery
protection should be added externally. For applications
using a regulated supply, external EMI/RFI protection is
often required. Insufficient protection can result in unexplained pulses on the output line, providing inaccurate
sensing information to the user.
20 Ω
R1
C1
0.033 µF
0.22 µF
C3
1
The filter capacitor and EMI protection circuitry can
easily be added to a PC board for use with these devices.
Provisions have been made for simple mounting of a
board on the back of the unit.
12
2
4
3
Vcc
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
X
X
+
-
Dwg. EH-008-1A
continued next page…
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
APPLICATIONS INFORMATION — Continued
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 below, a simple
Zener-controlled regulator is constructed using discrete
components. The RC low-pass filter on the supply line
(R 1 C 1 ) and a low-value supply bypass capacitor (C S ) can
be included, if necessary, so as to minimize susceptibility
to EMI/RFI. The npn transistor should be chosen with
sufficiently high forward breakdown voltage so as to
withstand supply-side transients. The series diode should
be chosen with sufficiently high reverse breakdown
capabilities so as to withstand the most negative transient. The current-limiting resistor (R Z ) and the Zener
diode should be sized for power dissipation requirements.
Capacitor leakage current at pin 3 will cause degradation in the low-speed performance of the device. Excess
capacitor leakage can result in the IC changing output
state without movement of the gear tooth being sensed.
In addition to the capacitor leakage, it is extremely important to minimize the leakage at the PC board and between
the pins of the device. Up to 50 nA of external leakage
can be tolerated at the capacitor pin node to ground.
Choice of low-leakage-current potting compounds and the
use of clean PC board techniques are extremely important.
OUTPUT
SUPPLY
C2
100 pF
RL
20 Ω
R1
2.5 k Ω
RZ
Capacitor Requirements. The choice of the capacitor at
pin 3 (C 3 ) defines the minimum operating speed of the
target. This capacitor (0.1µF minimum) is required to
stabilize the internal amplifiers as well as to eliminate the
signal offsets. Typically, a 0.33 µF low-leakage ceramic
capacitor is recommended. Values greater than 0.47µF
should not be used as this may cause high-speed performance degradation.
C1
0.033 µF
0.22 µF
C3
6.8 V
0.033 µF
CS
1
2
4
3
Additional applications Information on gear-tooth and
other Hall-effect devices is provided in the Allegro Electronic Data Book AMS-702 or Application Note 27701.
Vcc
X
X
+
-
Dwg. EH-008A
www.allegromicro.com
13
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
MECHANICAL INFORMATION
Component
Material
Function
Package Face
Thermoset epoxy
Maximum temperature
170 °C*
264 psi deflection temp. (DTUL)
66 psi deflection temp. (DTUL)
Approximate melting temperature
204 °C
216 °C
225 °C
Plastic Housing
Thermoplastic PBT,
30% glass filled
Units
Leads
Copper
–
–
Lead Integrity
–
–
8 oz.
Lead Finish
90/10 tin/lead solder plate
Flame Class Rating
–
–
†
–
UL94V-0
* 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.
Element Location (in millimeters)
(element location relative to package center is the design
objective)
2.235
Lead Cross-Section (in millimeters)
0.48
0.36
1.1
0.41
NOM.
0.1
0.38
0.44
0.35
NOM.
A
Dwg. MH-018 mm
0.0076
MIN. PLATING
THICKNESS
Dwg. MH-019A mm
continued next page…
14
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
ATS610LSA DIMENSIONS IN MILLIMETERS
1.27
7.25
5.00
TYP
1
2
3
9.0
4
0.41
0.38
3.9
3.0 NOM
A
0.9 DIA
8.3
8.0
2.0
9.0
SEE NOTE
Dwg. MH-017A mm
ATS611LSB 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.
NOTE — Nominal dimension and tolerances dependent on package material. Contact factory.
www.allegromicro.com
15
ATS610LSA AND ATS611LSB
DYNAMIC, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT
GEAR-TOOTH SENSOR ICS
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.
16
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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