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PDF ATS673 Data sheet ( Hoja de datos )
| Número de pieza | ATS673 | |
| Descripción | (ATS673 / ATS674) Self-Calibrating TPOS Gear Tooth Sensor Optimized | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ATS673 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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ATS673 and ATS674
Self-Calibrating TPOS Gear Tooth Sensor Optimized for
Automotive Cam Sensing Applications
Features and Benefits
▪ Tight timing accuracy over operating temperature range
▪ True zero-speed operation
▪ TPOS (True Power-On State)
▪ Air-gap-independent switchpoints
▪ High immunity to vibration
▪ Large operating air gaps
▪ Operation with supply voltages down to 3.3 V
▪ Digital output representing target profile
▪ Single-chip solution for high reliability
▪ Optimized Hall IC/magnet system
Continued on the next page…
Packages: 4 pin SIP (suffix SE)
Description
Recognizing the increasingly stringent requirements for EMC/
EMI in automotive applications,Allegro has taken the necessary
steps to design devices that are capable of withstanding the
effects of radiated and conducted transients. The ATS673
and ATS674 devices have been designed specifically for this
purpose. Advanced circuitry on the die allows them to survive
positive and negative transient pulses on both the input and
output.
The ATS673 and ATS674 devices retain all of the same
characteristics as theATS671 andATS672. The devices remain
true zero-speed gear tooth sensors with optimized Hall IC/
magnet configuration in an SIP (single in-line package). The
SIP assembly consists of a molded package that holds together
a samarium cobalt magnet, a pole piece, and a true zero-speed
Hall IC that has been optimized to the magnetic circuit.
The sensor incorporates a single element Hall IC that switches
in response to magnetic signals created by a ferrous target.
The IC contains a sophisticated digital circuit designed
to eliminate the detrimental effects of magnet and system
offsets.www.DataSheet4U.com Signal processing is used to provide zero-speed
Not to scale
ATS673-DS, Rev. 1
Continued on the next page…
V+
VCC
0.1 μF
CBYPASS
Functional Block Diagram
Hall
Amp
Voltage
Regulator
(Analog)
VREG(A)
Voltage
Regulator
(Digital)
VREG(D)
Offset Adjust
Temperature
Coefficient
Adjust
LPF
Automatic
Gain
Control
VPROC
Offset TC
VREF
Comp_P
Clock
Continuous
Update Logic
Output State
Clock
Continuous
Update Logic
Comp_N
Output State
9-Bit
PDAC
9
9-Bit
Counter
9-Bit
Counter
9
9-Bit
NDAC
Threshold
Output
TPOS
VREG(A)
Power-On
Reset
TPOS Trim
GND
(Recommended)
TEST
VREG(D)
Output
Driver
Threshold
Comparator
VOUT
1 page  
ATS673 and
ATS674
Self-Calibrating TPOS Gear Tooth Sensor Optimized
for Automotive Cam Sensing Applications
Air Gap Comparisons
Installation Air Gap
Branded Face
Target (Gear)
Sensor Device
Extended Maximum Air Gap, AGEXTMAX
Operational Air Gap Range, AG
9 TPOS Air Gap Range, AGTPOS
Extended Minimum Air Gap Air Gap, AGEXTMIN
Relative Timing Accuracy
Target
Mechanical Profile
Sensor Output
Electrical Profile
-HT Option
V+
VOUT
ErrRELR(Max – Min)
ErrRELF(Max – Min)
t
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
ATS673 and
ATS674
Self-Calibrating TPOS Gear Tooth Sensor Optimized
for Automotive Cam Sensing Applications
AGC (Automatic Gain Control)
The AGC feature is implemented by a unique patented self-
calibrating circuitry. After each power-on, the devices measure
the peak-to-peak magnetic signal. The gain of the sensor is then
adjusted, keeping the internal signal amplitude constant over the
air gap range of the device. This feature ensures that operational
characteristics are isolated from the effects of changes in AG.
The effect of AGC is shown in figure 7.
600
500
400
300
200
100
0
0
Magnetic Flux Density Versus Target Edge Position
AG (mm):
1.50
2.00
2.50
3.00
3.50
10 20 30 40 50 60 70 80 90
Target Rotation (°)
Internal Analog Signal after AGC Versus Target Edge Position
2.0
AG (mm):
1.5 1.50
2.00
2.50
3.00
3.50
1.0
0.5
0
0 10 20 30 40 50 60 70 80 90
Target Rotation (°)
Figure 7. Effect of AGC. The upper panel shows the magnetic gradient detected at the Hall element, with no amplification.
The lower panel displays the corresponding internal processed signal, VPROC. This normalized electrical signal allows optimal
performance by the rest of the circuits that reference this signal.
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ATS673.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ATS672LSB | Self-Calibrating TPO Gear-Tooth Sensor | Allegro MicroSystems |
| ATS673 | (ATS673 / ATS674) Self-Calibrating TPOS Gear Tooth Sensor Optimized | Allegro MicroSystems |
| ATS674 | (ATS673 / ATS674) Self-Calibrating TPOS Gear Tooth Sensor Optimized | Allegro MicroSystems |
| ATS675LSE | Self-Calibrating TPOS Speed Sensor | Allegro MicroSystems |
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