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PDF ATS642LSH Data sheet ( Hoja de datos )
| Número de pieza | ATS642LSH | |
| Descripción | Two-Wire True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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ATS642LSH
Two-Wire True Zero Speed Miniature Differential
Peak-Detecting Gear Tooth Sensor with Continuous Calibration
Features and Benefits
▪ Running mode calibration for continuous optimization
▪ Single chip IC for high reliability
▪ Internal current regulator for 2-wire operation
▪ Small mechanical size (8 mm diameter × 5.5 mm depth)
▪ Precise duty cycle signal over operating temperature range
▪ Large operating air gaps
▪ Automatic Gain Control (AGC) for air gap independent
switchpoints
▪ Automatic Offset Adjustment (AOA) for signal processing
optimization
▪ True zero-speed operation
▪ Undervoltage lockout
▪ Wide operating voltage range
Package: 4-pin Module (suffix SH)
Not to scale
Description
TheATS642LSH is an optimized Hall effect sensing integrated
circuit and magnet combination that provides a user-friendly
solution for true zero-speed digital gear-tooth sensing in two-
wire applications. The sensor consists of a single-shot molded
plastic package that includes a samarium cobalt magnet, a
pole piece, and a Hall effect IC that has been optimized to the
magnetic circuit. This small package, with optimized two-wire
leadframe, can be easily assembled and used in conjunction
with a wide variety of gear shapes and sizes.
The integrated circuit incorporates a dual element Hall effect
sensor and signal processing that switches in response to
differential magnetic signals created by ferrous gear teeth.
The circuitry contains a sophisticated digital circuit to reduce
magnet and system offsets, to calibrate the gain for air gap
independent switchpoints, and to achieve true zero-speed
operation. Signal optimization occurs at power-up through
the combination of offset and gain adjust and is maintained
throughout the operating time with the use of a running mode
calibration. The running mode calibration allows immunity to
environmental effects such as microoscillations of the target
or sudden air gap changes.
The regulated current output is configured for two wire
applications and the sensor is ideally suited for obtain-
Continued on the next page…
Engineering samples available on a limited basis. Contact your local
sales or applications support office for additional information.
Functional Block Diagram
Hall
Amplifier
Gain
VCC
Automatic Offset
Control
AOA DAC
Tracking
DAC
Peak Hold
AGC DAC
Gain Control
ATS642LSH-DS, Rev. 1
Internal Regulator
Test Signals
GND
Test
1 page  
ATS642LSH
Two-Wire True Zero Speed Miniature Differential
Peak-Detecting Gear Tooth Sensor with Continuous Calibration
REFERENCE TARGET, 60-0 (60 Tooth Target)
Characteristics
Symbol
Test Conditions
Typ. Units
Outside Diameter
Face Width
Angular Tooth Thickness
Angular Valley Thickness
Do Outside diameter of target 120 mm
F
Breadth of tooth, with
respect to sensor
6 mm
t
Length of tooth, with
respect to sensor
3 deg
tv
Length of valley, with
respect to sensor
3 deg
Tooth Whole Depth
Material
ht
Low Carbon Steel
3 mm
––
Symbol Key
t Do
ht
F
tv
Air Gap
Branded Face of Sensor
800
700
600
500
400
300
200
100
0
0.5
Reference Gear Magnetic Gradient Amplitude
With Reference to Air Gap
1 1.5 2 2.5
Air Gap (mm)
Branded Face
of Sensor
3 Reference Target
60-0
500
400
300
200
100
0
-100
-200
-300
-400
-500
0
Reference Gear Magnetic Profile
Two Tooth-to-Valley Transitions
3.00 mm AG
0.50 mm AG
Air Gap
(mm)
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
2 4 6 8 10 12
Gear Rotation (°)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
ATS642LSH
Two-Wire True Zero Speed Miniature Differential
Peak-Detecting Gear Tooth Sensor with Continuous Calibration
Automatic Gain Control (AGC)
This feature allows the device to operate with an optimal internal
electrical signal, regardless of the air gap (within the AG speci-
fication). During calibration, the device determines the peak-to-
peak amplitude of the signal generated by the target. The gain of
the sensor is then automatically adjusted. Figure 5 illustrates the
effect of this feature.
Automatic Offset Adjust (AOA)
The AOA is patented circuitry that automatically compensates
for the effects of chip, magnet, and installation offsets. (For
capability, see Dynamic Offset Cancellation, in the Operat-
ing Characteristics table.) This circuitry is continuously active,
including both during calibration mode and running mode, com-
pensating for any offset drift. Continuous operation also allows it
to compensate for offsets induced by temperature variations over
time.
Digital Peak Detection
A digital DAC tracks the internal analog voltage signal VPROC,
and is used for holding the peak value of the internal analog
signal. In the example shown in figure 6, the DAC would first
track up with the signal and hold the upper peak’s value. When
VPROC drops below this peak value by BOP, the device hyster-
esis, the output would switch and the DAC would begin tracking
the signal downward toward the negative VPROC peak. Once the
DAC acquires the negative peak, the output will again switch
states when VPROC is greater than the peak by the value BRP. At
this point, the DAC tracks up again and the cycle repeats. The
digital tracking of the differential analog signal allows the sensor
to achieve true zero-speed operation.
Ferrous Target
Mechanical Profile
V+
Internal Differential
Analog Signal
Response, without AGC
V+
Internal Differential
Analog Signal
Response, with AGC
AGLarge
AGSmall
AGSmall
AGLarge
V+
Internal
Differential
Analog Signal
I+
Device
Output Current
BOP
Figure 5. 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, a
shown in the lowest panel.
Figure 6: Peak Detecting Switchpoint Detail
BRP
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
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| PDF Descargar | [ Datasheet ATS642LSH.PDF ] | |
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