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PDF ATS667LSG Data sheet ( Hoja de datos )
| Número de pieza | ATS667LSG | |
| Descripción | High Accuracy Gear Tooth Sensor | |
| Fabricantes | Allegro Micro Systems | |
| Logotipo |  |
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ATS667LSG
True Zero-Speed, High Accuracy Gear Tooth Sensor
Features and Benefits
www.da▪taOsphetiemt4iuz.ecdomrobustness against magnetic offset variation
▪ Small signal lockout for immunity against vibration
▪ Tight duty cycle and timing accuracy over full operating
temperature range
▪ True zero-speed operation
▪ Air gap independent switchpoints
▪ Large operating air gaps achieved through use of gain
adjust and offset adjust circuitry
▪ Defined power-on state (POS)
▪ Wide operating voltage range
▪ Digital output representing target profile
▪ Single chip sensing IC for high reliability
▪ Small mechanical size
▪ Optimized Hall IC magnetic system
▪ Fast start-up
▪ Undervoltage lockout (UVLO)
Package: 4-pin SIP Module (suffix SG)
Description
The ATS667 is a true zero-speed gear tooth sensor consisting
of an optimized Hall IC-magnet configuration in a single
overmolded module. The unique IC and package design
provides a user-friendly solution for digital gear tooth sensing
applications. 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. The IC contains a sophisticated compensating
circuit designed to eliminate the detrimental effects of magnet
and system offsets. Digital processing of the analog signal
provides zero-speed performance independent of air gap and
also 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.
Hysteresis in the thresholds reduces the negative effects of any
anomalies in the magnetic signal associated with the targets
used in many automotive applications.
The ATS667 is optimized for transmission applications. It is
available in a lead (Pb) free 4-pin SIP module package with a
100% matte tin plated leadframe.
Not to scale
VCC
Functional Block Diagram
Voltage
Regulator
Hall
Amp
Offset
Adjust
Automatic
Gain
Control
VPROC
PDAC
NDAC
PThresh
Reference
Generator
NThresh
Threshold
Comparator
Threshold
Logic
TEST
ATS667-DS
GND
Current
Limit
Output
Transistor
VOUT
1 page  
ATS667LSG True Zero-Speed, High Accuracy Gear Tooth Sensor
Reference Target 60-0 (60 Tooth Target)
www.datasheet4u.com
Characteristics
Symbol
Test Conditions
Outside Diameter
Face Width
Angular Tooth Thickness
Angular Valley Thickness
Do Outside diameter of target
F
Breadth of tooth, with respect
to sensor
t
Length of tooth, with respect
to sensor
tv
Length of valley, with respect
to sensor
Tooth Whole Depth
Material
ht
Low Carbon Steel
Typ.
120
6
3
3
3
–
Units
mm
mm
deg.
deg.
mm
–
Symbol Key
t Do
ht
F
tv
Air Gap
Branded Face of Sensor
1400
1200
1000
800
600
400
200
0
0.5
Reference Gear Magnetic Gradient Amplitude
With Reference to Air Gap
1.0 1.5
2.0 2.5
Air Gap (mm)
Branded Face
of Sensor
3.0 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
3.10 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
3.10
2 4 6 8 10 12
Gear Rotation (°)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
ATS667LSG True Zero-Speed, High Accuracy Gear Tooth Sensor
Undervoltage Lockout
wwWwh.deantatshheeesut4pup.clyomvoltage falls below the undervoltage lockout
voltage, VCC(UV) , the device enters Reset, where the output
state returns to the Power-On State (POS) until sufficient VCC
is supplied. ICC levels may not meet datasheet limits when VCC
< VCC(min). This lockout feature prevents false signals, 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 VCC range. For devices that must operate from an unregu-
lated power supply, transient protection must be added externally.
For applications using a regulated line, EMI/RFI protection may
still be required. Contact Allegro for information on the circuitry
needed for compliance with various EMC specifications. Refer
to figure 6 for an example of a basic application circuit.
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). At power-on, 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 7 illustrates the
effect of this feature.
Automatic Offset Adjust (AOA)
The AOA circuitry automatically compensates for the effects of
chip, magnet, and installation offsets. This circuitry is continu-
ously active, including during both power-on mode and running
mode, compensating for any offset drift (within the Allowable
User Induced Differential Offset). Continuous operation also
allows it to compensate for offsets induced by temperature varia-
tions over time.
Running Mode Lockout
The ATS667 has a running mode lockout feature to prevent
switching in response to small signals that are characteristic of
vibration signals. The internal logic of the chip considers small
signal amplitudes below a certain level to be vibration. The out-
put is held to the state prior to lockout until the amplitude of the
signal returns to normal operational levels.
Assembly Description
The ATS667 is integrally molded into a plastic body that has
been optimized for size, ease of assembly, and manufacturability.
High operating temperature materials are used in all aspects of
construction.
VCC
CBYPASS
0.1 μF
(Required)
ATS667
1 VCC
VOUT 2
GND TEST
43
VPULLUP
RPULLUP
CL
Ferrous Target
Mechanical Profile
V+
Internal Differential
Analog Signal
Response, without AGC
V+
Internal Differential
Analog Signal
Response, with AGC
AGLarge
AGSmall
AGSmall
AGLarge
Figure 6. Typical circuit for proper device operation.
Figure 7. Automatic Gain Control (AGC). The AGC function corrects for
variances in the air gap. Differences in the air gap cause differences in
the magnetic field at the device, but AGC prevents that from affecting
device performance, as shown in the lowest panel.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ATS667LSG.PDF ] | |
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