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PDF ATS617LSG Data sheet ( Hoja de datos )
| Número de pieza | ATS617LSG | |
| Descripción | Differential Hall Effect Gear Tooth Sensor | |
| Fabricantes | Allegro Micro Systems | |
| Logotipo |  |
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ATS617LSG
Dynamic, Self-Calibrating, Peak-Detecting, Differential
Hall Effect Gear Tooth Sensor
Features and Benefits
www.da▪taSsehlef-ect4auli.bcoramting for tight timing accuracy
▪ First-tooth detection
▪ Immunity to air gap variation and system offsets
▪ Immunity to signature tooth offsets
▪ Integrated capacitor provides analog peak and
valley information
▪ Low timing-accuracy drift with temperature changes
▪ Low radiated emissions
▪ Integrated, series resistor on VCC pin for improved
transient immunity
▪ Large air gap capability
▪ Small, integrated package
▪ Optimized magnetic circuit
▪ Undervoltage lockout (UVLO)
▪ Wide operating voltage range
Package: 4-pin SIP (suffix SG)
Description
The ATS617 gear-tooth sensor is a peak-detecting device
that uses automatic gain control and an integrated capaci-
tor to provide extremely accurate gear edge detection down
to low operating speeds. Each sensor module consists of a
high-temperature plastic shell that holds together a samar-
ium-cobalt magnet, a pole piece, and a differential open-
collector Hall IC that has been optimized to the magnetic
circuit. This small package can be easily assembled and
used in conjunction with a wide variety of gear shapes and
sizes.
The gear-sensing technology used for this sensor module is
Hall-effect based. The sensor incorporates a dual-element
Hall IC that switches in response to differential magnetic
signals created by ferrous targets. The sophisticated pro-
cessing circuitry contains an A-to-D converter that self-
calibrates (normalizes) the internal gain of the device to
minimize the effect of air gap variations. The patented
peak-detecting filter circuit provides immunity to magnet
and system offsets and has the ability to discriminate rela-
tively fast changes such as those caused by tilt, gear wobble,
and eccentricities. This easy-to-integrate solution provides
first falling edge detection and stable operation to extremely
low rpm. The ATS617 can be used as a replacement for the
ATS616.
Not to scale
Continued on the next page…
Functional Block Diagram
VCC
Hall
Amp
Hall
Amp
RS Voltage
Regulator
UVLO
Gain
Reference
Generator
Power-On
Logic
Tooth and Valley
Comparator
Track and
Hold
Current
Limit
Track and
Hold
VOUT
ATS617LSG-DS
GND
(Recommended)
TEST
1 page  
ATS617LSG
Dynamic, Self-Calibrating, Peak-Detecting, Differential
Hall Effect Gear Tooth Sensor
www.datasheet4u.com
Reference Target (Gear) Information
REFERENCE TARGET 60+2
Characteristics
Symbol
Test Conditions
Typ.
Outside Diameter
Face Width
Angular Tooth
Thickness
Signature Region
Angular Tooth
Thickness
Angular Valley
Thickness
Tooth Whole Depth
Material
Do Outside diameter of target
120
F
Breadth of tooth, with respect
to sensor
6
t
Length of tooth, with respect
to sensor; measured at Do
3
Length of signature tooth,
tSIG with respect to sensor; mea- 15
sured at Do
tv
Length of valley, with respect
to sensor; measured at Do
3
ht 3
Low Carbon Steel
–
Units
mm
mm
deg.
deg.
deg.
mm
–
Symbol Key
t Do
ht
tSIG
F
tv
Air Gap
Branded Face of Sensor
Signature Region
Pin 4
Pin 1
Branded Face
of Sensor
Reference Target
60+2
Figure 1. Configuration with Radial-Tooth Reference Target
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
ATS617LSG
Dynamic, Self-Calibrating, Peak-Detecting, Differential
Hall Effect Gear Tooth Sensor
Functional Description
www.datasheet4u.com
Assembly Description The ATS617 gear-tooth sensor is a
Hall IC/magnet configuration that is fully optimized to pro-
vide detection of gear tooth edges. This sensor is packaged in a
molded miniature plastic body that has been optimized for size,
ease of assembly, and manufacturability. High operating tem-
perature materials are used in all aspects of construction.
After proper power is applied to the component, the sensor is
capable of instantly providing digital information that is repre-
sentative of the profile of a rotating gear. No additional optimi-
zation or processing circuitry is required. This ease of use should
reduce design time and incremental assembly costs for most
applications.
Sensing Technology The gear tooth sensor module contains
a single-chip differential Hall effect sensor IC, a samarium
cobalt magnet, and a flat ferrous pole piece (figure 2). The Hall
IC consists of 2 Hall elements (spaced 2.2 mm apart) located so
as to measure the magnetic gradient created by the passing of a
ferrous object. The two elements measure the magnetic gradient
and convert it to an analog voltage that is then processed in order
to provide a digital output signal.
The Hall IC is self-calibrating and also possesses a tempera-
ture compensated amplifier and offset cancellation circuitry. Its
voltage regulator provides supply noise rejection throughout the
operating voltage range. Changes in temperature do not greatly
affect this device due to the stable amplifier design and the offset
rejection circuitry. The Hall transducers and signal processing
electronics are integrated on the same silicon substrate, using a
proprietary BiCMOS process.
Internal Electronics The processing circuit uses a patented
peak detection scheme to eliminate magnet and system offsets.
This technique allows dynamic coupling and filtering of offsets
without the power-up and settling time disadvantages of classical
high-pass filtering schemes. The peak signal of every tooth and
valley is detected by the filter and is used to provide an instant
reference for the operate and release point comparator. In this
manner, the thresholds are adapted and referenced to individual
signal peaks and valleys, providing immunity to zero line varia-
tion from installation inaccuracies (tilt, rotation, and off-center
placement), as well as for variations caused by target and shaft
eccentricities.
The ATS617 also includes self-calibration circuitry that is
engaged at power on. The signal amplitude is measured, and
then the device gain is normalized. In this manner switchpoint
drift versus air gap is minimized, and excellent timing accuracy
can be achieved.
The AGC (Automatic Gain Control) circuitry, in conjunction
with a unique hysteresis circuit, also eliminates the effect of gear
edge overshoot as well as increases the immunity to false switch-
ing caused by gear tooth anomalies at close air gaps. The AGC
circuit sets the gain of the device after power-on.
Target (Gear)
Hall Element 2
Dual-Element
Hall Effect Device
(Pin n >1 Side)
South Pole
North Pole
Element Pitch
Hall Element 1
Hall IC
(CPoolnecPeinetcraetor)
Back-biasing Magnet
Case
(Pin 1 Side)
Figure 2. Relative motion of the target is detected by the dual Hall ele-
ments mounted on the Hall IC.
V+
Differential
Input Signal
VPROC
0
V–
BOP
BOP
BRP
BRP
VCC
Device Output
VOUT
VOUT(sat)
Figure 3. The peaks in the resulting differential signal are used to set the
operate, BOP, and release, BRP, switchpoints.
Allegro MicroSystems, Inc.
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 ATS617LSG.PDF ] | |
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