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PDF ATS675LSE Data sheet ( Hoja de datos )
| Número de pieza | ATS675LSE | |
| Descripción | Self-Calibrating TPOS Speed Sensor | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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ATS675LSE
Self-Calibrating TPOS Speed Sensor
Optimized for Automotive Cam Sensing Applications
Features and Benefits
▪ Chopper stabilized; optimized for automotive cam
sensing applications
▪ Optimized absolute timing accuracy step size through
gradual transition from TPOS to Running Mode
▪ High immunity to signal anomalies resulting from
magnetic overshoot and peak-to-peak field variation
▪ Tight timing accuracy over full operating
temperature range
▪ True zero-speed operation
▪ Automatic Gain Control circuitry for air gap
independent switchpoints
▪ Operation at supply voltages down to 3.3 V
▪ Digital output representing target profile
▪ Undervoltage lockout (UVLO)
▪ Patented Hall IC-magnet system
▪ Increased output fall time for improved radiated
emissions performance
Package: 4-pin SIP module (suffix SE)
Not to scale
1
2
34
Description
The ATS675 is the next generation of the Allegro® True
Power-On State (TPOS) sensor family, offering improved
accuracy compared to prior generations, gradual TPOS to
Running Mode adjustment for accuracy-shift reduction,
and longer output fall time for improved radiated emissions
performance. The ATS675 provides absolute zero-speed
performance and TPOS information.
The sensor incorporates a single-element Hall IC with an
optimized custom magnetic circuit that switches in response
to magnetic signals created by a ferromagnetic target. The IC
contains a sophisticated digital circuit designed to eliminate
the detrimental effects of magnet and system offsets. Signal
processing is used to provide device performance at zero target
speed, independent of air gap, and which adapts dynamically
to the typical operating conditions found in automotive
applications, particularly camshaft-sensing applications.
High resolution peak-detecting DACs are used to set the adaptive
switching thresholds of the device, ensuring high accuracy
despite target eccentricity. Internal hysteresis in the thresholds
reduces the negative effects of anomalies in the magnetic signal
(such as magnetic overshoot) associated with targets used in
many automotive applications. The resulting output of the
device is a digital representation of the ferromagnetic target
profile. The ATS675 also includes a low bandwidth filter that
increases the noise immunity and the signal-to-noise ratio of
the sensor.
The device package is lead (Pb) free, with 100% matte tin
leadframe plating.
Typical Application
VS
CBYPASS
0.1 μF
1
VCC
ATS675
32
A TEST
OUT
GND
4
A Recommended
VPU
RPU
Sensor
Output
CL
ATS675LSE-DS
Figure 1. Operational circuit for the ATS675
1 page  
ATS675LSE
Self-Calibrating TPOS Speed Sensor
Optimized for Automotive Cam Sensing Applications
OPERATING CHARACTERISTICS (continued) Valid using reference target 8X, TA, TJ, and VCC within specification, unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.1
Max.
Unit
Tooth Speed
Analog Signal Bandwidth
fSIG Tooth signal frequency, sinusoidal input signal
0
– 8000 Hz
BW Equivalent to –3 dB cutoff frequency
– 20 – kHz
Switchpoint Characteristics
Switchpoint
Internal Hysteresis12
Calibration
Initial Calibration13
BST
BHYS
% of peak-to-peak, referenced to tooth signal
(see figure 4)
% of peak-to-peak signal
CALI
Quantity of mechanical falling edges during
which device is in full TPOS Mode
– 30
– 10
––
–%
–%
4 Edges
Quantity of target teeth after CALI over which
TPO to Running Mode Adjustment
CALTPORM TPOS to Running Mode threshold adjustment
1
–
16 Teeth
occurs
Signal Characteristics
Reduction in VPROC amplitude from VPROC(high)
Breduce(G) to lowest peak VPROC(reduce), all specifications – – 15 %pk-pk
within range (see figure 5)
Maximum Allowable Signal Reduction14
Reduction in VPROC amplitude from VPROC(high)
Breduce(NG)
to lowest peak VPROC(reduce); output switches,
other specifications may be out of range (see
–
–
25 %pk-pk
figure 5)
1Typical values are at TA = 25°C and VCC = 12 V. Performance may vary for individual units, within the specified maximum and minimum limits.
2Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.
3Maximum current limit is equal to ICC(max) + 3 mA.
4Negative current is defined as conventional current coming out of (sourced from) the specified device terminal.
5Power-On Time is the duration from when VCC rises above VCC(min) until a valid output state is realized.
6Output Delay Time is the duration from when a crossing of the magnetic signal switchpoint, BST, occurs to when the electrical output signal, VOUT ,
reaches 90% of VOUT(high).
7Characterization data shows 12 V fall time to be 1.5 times longer than 5 V fall time. See figure 2.
8The Operational Air Gap Range is the range of installation air gaps within which the TPOS (True Power-On State) function is guaranteed to correctly
detect a tooth when powered-on opposite a tooth and correctly detecting a valley when powered-on opposite a valley, using reference target 8X.
9The Extended Air Gap Range is a range of installation air gaps, larger than AGTPOS, within which the device will accurately detect target features in
Running Mode, but TPOS functionality is NOT guaranteed, possibly resulting in undetected target features during Initial Calibration. Relative Timing
Accuracy (ErrREL) not guaranteed in Extended Air Gap Range.
10The term mechanical edge refers to a target feature, such as the side of a gear tooth, passing opposite the device. A rising edge is a transition from a
valley to a tooth, and a falling edge is a transition from a tooth to a valley. See figure 7.
11Relative Timing Accuracy refers to the difference in accuracy, relative to a 0.5 mm air gap, through the entire Operational Air Gap Range. See figure 7.
12Refer to Functional Description section for a description of Internal Hysteresis.
13Signal frequency, fSIG < 200 Hz.
14Running Mode; 4X target used. The Operational Signal Amplitude, VPROC, is the internal signal generated by the Hall detection circuitry and
normalized by Automatic Gain Calibration.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
ATS675LSE
Self-Calibrating TPOS Speed Sensor
Optimized for Automotive Cam Sensing Applications
Sensor and Target Evaluation
Magnetic Profile
In order to establish the proper operating specification for a par-
ticular sensor device and target system, a systematic evaluation
of the magnetic circuit should be performed. The first step is the
generation of a magnetic map of the target. By using a calibrated
device, a magnetic profile of the system is made. Figure 11 is a
magnetic map of the 8X reference target.
A pair of curves can be derived from this map data, and be used
to describe the tooth and valley magnetic field strength, B, versus
the size of the air gap, AG. This allows determination of the mini-
mum amount of magnetic flux density that guarantees operation
of the sensor, so the system designer can determine the maximum
allowable AG for the sensor and target system. One can also
determine the TPOS air gap capabilities of the sensor by compar-
ing the minimum tooth signal to the maximum valley signal.
1600
1400
1200
1000
800
600
400
200
0
0
Magnetic Map, Reference Target 8X with SE Package
60 120 180 240 300
Target Rotation (°)
360
Air Gap Versus Magnetic Field, Reference Target 8X with SE Package
1300
1200
1100
1000
900
800
700
600
500 Tooth
400 Valley
300
200
100
0
0 1.0 2.0 3.0 4.0 5.0 6.0
AG (mm)
Figure 11. Magnetic Data for the 8X Reference Target and SE package. Flux
density measurements are relative to the baseline magnetic field.
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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