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PDF ATS625LSG Data sheet ( Hoja de datos )
| Número de pieza | ATS625LSG | |
| Descripción | True Zero-Speed Low-Jitter High Accuracy Gear Tooth Sensor | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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ATS625LSG
True Zero-Speed Low-Jitter
High Accuracy Gear Tooth Sensor
Features and Benefits
▪ Highly repeatable over operating temperature range
▪ Tight timing accuracy over operating temperature range
▪ True zero-speed operation
▪ Air-gap–independent switchpoints
▪ Vibration immunity
▪ Large operating air gaps
▪ Defined power-on state
▪ Wide operating voltage range
▪ Digital output representing target profile
▪ Single-chip sensing IC for high reliability
Continued on the next page…
Package: 4 pin SIP (suffix SG)
Description
The ATS625 true zero-speed gear tooth sensor is an optimized
Hall IC and magnet configuration packaged in a molded module
that provides a manufacturer-friendly solution for digital gear
tooth sensing applications. The sensor assembly consists of an
over-molded package that holds together a samarium cobalt
magnet, a pole piece concentrator, and a true zero-speed Hall
IC that has been optimized to the magnetic circuit. This small
package can be easily assembled and used in conjunction with
gears of various shapes and sizes.
The sensor incorporates a dual-element Hall IC that switches
in response to differential magnetic signals created by a ferrous
target. Digital processing of the analog signal provides zero-
speed performance independent of air gap as well as dynamic
adaptation of device performance to the typical operating
conditions found in automotive applications (reduced vibration
sensitivity). High-resolution peak detecting DACs are used to
set the adaptive switching thresholds of the device. Switchpoint
hysteresis reduces the negative effects of any anomalies in
the magnetic signal associated with the targets used in many
automotive applications. This sensor system is optimized
Not to scale
V+
VCC
0.1 F
CBYPASS
Continued on the next page…
Functional Block Diagram
Voltage
Regulator
Hall
Amp
Automatic
Gain
Control
VPROC
PDAC
NDAC
PPeak
NPeak
Reference
Generator
PThresh
NThresh
Threshold
Comparator
Threshold
Logic
ATS625LSG-DS, Rev. 2
GND
(Recommended)
AUX
Current
Limit
Output
Transistor
VOUT
1 page  
ATS625LSG
True Zero-Speed Low-Jitter High Accuracy
Gear Tooth Sensor
Reference Target (Gear) Information
REFERENCE TARGET 60+2
Characteristics
Symbol
Test Conditions
Typ.
Outside Diameter
Face Width
Circular Tooth Length
Signature Region Cir-
cular Tooth Length
Circular Valley Length
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
mm
mm
mm
mm
–
Symbol Key
Branded Face
of Sensor
tV
ØDO F
ht
Air Gap
Signature Region
Pin 4
Pin 1
Branded Face
of Sensor
Reference Target
60+2
Figure 1. Configuration with Radial-Tooth Reference Target
For the generation of adequate magnetic field levels, the fol-
lowing recommendations should be followed in the design and
specification of targets:
• 2 mm < tooth width, t < 4 mm
• Valley width, tv > 2 mm
• Valley depth, ht > 2 mm
• Tooth thickness, F ≥ 3 mm
• Target material must be low carbon steel
Although these parameters apply to targets of traditional
geometry (radially oriented teeth with radial sensing, shown in
figure 1), they also can be applied in applications using stamped
targets (an aperture or rim gap punched out of the target mate-
rial) and axial sensing. For stamped geometries with axial sens-
ing, the valley depth, ht, is intrinsically infinite, so the criteria for
tooth width, t, valley width, tv, tooth material thickness, F, and
material specification need only be considered for reference. For
example, F can now be < 3 mm.
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
ATS625LSG
True Zero-Speed Low-Jitter High Accuracy
Gear Tooth Sensor
Undervoltage Lockout
When the supply voltage falls below the undervoltage lockout
level, VCCUV, the device switches to the OFF state. The device
remains in that state until the voltage level is restored to to the
VCC operating range. Changes in the target magnetic profile
have no effect until voltage is restored. This prevents false sig-
nals caused by undervoltage conditions from propagating to the
output of the sensor.
Power Supply Protection
The device contains an on-chip regulator and can operate over
a wide range of supply voltage levels. For applications using an
unregulated power supply, transient protection must be added
externally. For applications using a regulated supply line, EMI
and RFI protection may still be required. The circuit shown in
figure 5 is the basic configuration required for proper device
operation. Contact Allegro field applications engineering for
information on the circuitry required for compliance to various
EMC specifications.
Internal Electronics
The ATS625LSG contains a self-calibrating Hall effect IC
that possesses two Hall elements, a temperature compensated
amplifier and offset cancellation circuitry. The IC also contains
a voltage regulator that provides supply noise rejection over the
operating voltage range. The Hall transducers and the electron-
ics are integrated on the same silicon substrate by a proprietary
BiCMOS process. Changes in temperature do not greatly affect
this device due to the stable amplifier design and the offset rejec-
tion circuitry.
VS
1
VCC
CBYPASS
ATS625
0.1 µF 3 AUX
2
VOUT
RPU
Sensor Output
GND
4
Figure 5. Power Supply Protection Typical Circuit
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ATS625LSG.PDF ] | |
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