ATS671LSE Specification
Preliminary – Subject to Change
Pin Out Diagram
Self Calibrating TPOS Gear Tooth Sensor with
9Bit Signal Capture
The ATS671LSE true zero speed gear tooth sensors are
optimized Hall IC/magnet configurations packaged in a Single In
Line Package (SIP) that provides a user-friendly solution for digital
gear tooth sensing applications. The SIP module consists of an
over-molded package, which holds together a samarium cobalt
magnet, a pole piece and a true zero-speed Hall IC that has been
optimized to the magnetic circuit. This package can be easily
assembled and used in conjunction with gears of various shapes
and sizes.
The sensor incorporates a single element Hall IC that switches
in response to the magnetic signal created by a ferrous 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 zero speed performance independent of air gap
and also to dynamically adapt device performance to the typical
operating conditions found in automotive applications (reduced
vibration sensitivity). High-resolution (9-bit) 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 (such as magnetic overshoot)
associated with the targets used in many automotive applications.
The ATS671LSE also includes a low bandwidth filter that increases
the noise immunity and the signal to noise ratio of the sensor.
These features result in potential improvements in both the timing
accuracy and the jitter performance of the device.
The ATS671LSE-LT sensor system is optimized for cam
applications and is available with or without the TPOS function
FEATURES
Pin 1: V
CC
Pin 2: V
OUT
Pin 3: Test Pin (Tie to GND)
Pin 4: Gnd
ABSOLUTE MAXIMUM RATINGS
Supply Voltage,
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . 26.5 V
Reverse Supply Voltage,
V
R
. . . . . . . . . . . . . . . . . . . . . . . . . . . . –18 V
Reverse Output Voltage,
V
ORout
. . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V
Continuous Output Current,
I
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Storage Temperature,
T
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . 170° C
Package Power Rating,
ϑ
JA
.SB. . . . . . . . . . . . . . . . . . . ~150° C/W
Maximum Junction Temperature,
T
Jmax
. . . . . . . . . . . . . . . . . . . . . . . . . 170° C
Maximum Junction Temperature – 100 Hours,
T
Jmax
. . . . . . . . . . . . . . . . . . . . . . . . . 180° C
s
s
s
s
s
s
s
s
s
s
s
s
s
Tight timing accuracy over temperature
True zero speed operation
True power on state
Air gap independent switch points
High vibration immunity
Large operating air gaps
Operation down to 3.3V
Digital output representing target profile
Single chip solution for high reliability
Small mechanical size
Optimized Hall IC magnetic system
AGC and reference adjust circuit
Under-voltage lockout
ATS671LSE
SELF CALIBRATING TPOS GEAR TOOTH SENSOR WITH 9BIT SIGNAL CAPTURE
Preliminary – Subject to Change
OPERATING CHARACTERISTICS
Valid at T
a
= -40C to 150C and power supply within specification unless
otherwise noted
Characteristics
Symbol
Test Conditions
Min.
ELECTRICAL CHARACTERISTICS
Supply Voltage
Reverse Supply Voltage
Supply Zener Clamp Voltage
Supply Zener Current
Supply Current
V
CC
V
RCC
V
Z
I
Z
I
CC
Tj < Tjmax; pulsed
Output = OFF
Output = ON
3
3
6.5
6.5
Operating; Tj < Tjmax
I
RCC
= -5mA (max)
28
33
3.3
26.5
-18
37
100
11
11
V
V
V
mA
mA
mA
Limits
Typ.
Max.
Units
POWER-ON STATE CHARACTERISTICS
Power Up Time
Under Voltage Lockout
OUTPUT STAGE
Low Output Voltage
Output Current Limit
Output Leakage Current
Output Rise Time
Output Fall Time
V
LOUT
I
lin
I
OFF
t
r
t
f
I
SINK
= 15 mA, Output = ON
Output = ON, Tj < Tjmax
Output = OFF, V
OUT
= Vcc
(Max)
R
L
= 500
Ω,
C
L
= 10 pF, T
a
= 25C
R
L
= 500
Ω,
C
L
= 10 pF, T
a
= 25C
-
25
-
-
-
0.9
0.5
0.2
45
0.45
70
10
5
5
V
mA
µA
µs
µs
t
PO
V
UV
Gear Speed < 100 RPM; Vcc> 3.3V
-
-
500
<Vcc
Min
uS
V
Rise and Fall Time
Output High
90%
90%
100%
10%
10%
t
r
t
f
Output Low
Time
[Seconds]
Rev. 1.3, MHN, 09.May.2003
Page
2 of 11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS671LSE
SELF CALIBRATING TPOS GEAR TOOTH SENSOR WITH 9BIT SIGNAL CAPTURE
Preliminary – Subject to Change
Characteristics
Symbol
Test Conditions
Min.
Limits
Typ.
Max.
Units
SWITCH POINT CHARACTERISTICS
Tooth Speed
Bandwidth
Operate Point
Release Point
Output Polarity
S
max
f-3db
Bop%
Brp%
Vout
% of peak to peak referenced to tooth
signal, AG < Agmax;
% of peak to peak referenced to tooth
signal, AG < Agmax;
Over Valley
Over Tooth
Calibration
Initial Calibration
AGC Disable
C
I
C
f
Number of Rising Mechanical Edges for
Accurate Edge Detection
Number of Rising Mechanical Edges
Required to Complete AGC Calibration
3
3
Edges
Edges
0
40
+40
+50
HIGH
LOW
8
KHz
KHz
%
%
Switchpoints
Tooth Signal
Bop%
Brp%
Bop%
Brp%
Valley Signal
100%
Rev. 1.3, MHN, 09.May.2003
Page
3 of 11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS671LSE
SELF CALIBRATING TPOS GEAR TOOTH SENSOR WITH 9BIT SIGNAL CAPTURE
Preliminary – Subject to Change
OPERATION WITH 8X Reference Target over Operational Air Gap and Temperature with Test Circuit #1 Unless
Otherwise Stated
Characteristics
Symbol
Test Conditions
Min.
T
ICRel
1
Limits
Typ.
3
Max.
6
Units
°
Relative Timing Accuracy
T
Rel
T
Rel
2
3
4
TPOS Air Gap Min
TPOS Air Gap Range
TPOS Air Gap Max
AG
Min
AG
TPOS
AG
Max
AG
t
θE
Rising and Falling Edge, RPM = 1000
During Initial Calibration
Gear Eccentricity < 0.1mm
Rising Mechanical Edge
After Initial Calibration, RPM = 1000
Gear Eccentricity < 0.1mm
Falling Mechanical Edge
After Initial Calibration, RPM = 1000
Gear Eccentricity < 0.1mm
Valleys May be Detected as Teeth:
Incorrect TPOS
Distance for Correct TPOS Functionality
Teeth May be Detected as a Valley:
Incorrect TPOS
Output Switching: Running Mode Only
360° Repeatability, 1000 edges
-
0.5
0.8
°
-
-
0.5
2.5
0.5
0.8
-
-
-
-
0.04
1.2
0.5
2.5
5.0
2.5
°
mm
mm
mm
mm
°
Operational Air Gap Range
Edge Repeatability
1
2
Relative Timing Accuracy Range is the change in edge position over the operational air gap and temperature range.
The TPOS Air Gap Min is the Installation Air Gap where the device may detect Valleys as Teeth. The True Power On
Function is
NOT
guaranteed to operate.
3
The TPOS Air Gap Range is the Installation Air Gap Range where the True Power On Function is guaranteed to
operate. Operating is defined as correctly detecting a tooth when powered up over a tooth and correctly detecting a valley
when powered up over a valley using the Reference Target. This specification is only valid for targets that meet or
exceed the ‘Gear Parameters for Correct TPOS Operation’ section of this document.
4
The TPOS Air Gap Max is the Installation Air Gap where the device may detect a Tooth as a Valley. The True Power On
Function is
NOT
guaranteed to operate.
Rev. 1.3, MHN, 09.May.2003
Page
4 of 11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS671LSE
SELF CALIBRATING TPOS GEAR TOOTH SENSOR WITH 9BIT SIGNAL CAPTURE
Preliminary – Subject to Change
Relative Timing Accuracy
Target
Absolute Timing Accuracy
Target
T
AbsRise
T
AbsFall
Device Output
Device Output
T
AbsRise
(Max - Min)
T
AbsFall
(Max - Min)
T
AbsFall
(Max - Min)
Operational Air Gap
Valley
Tooth
Air Gap
TPOS Air Gap
Valley
Tooth
TPOS Air Gap
TPOS Air Gap
Range
Min
TPOS Air Gap
Max
Rise and Fall Time
Output Rise Time: R=500Ohms C=10pF
Output Fall Time: R = 500Ohms C = 10pF
Rev. 1.3, MHN, 09.May.2003
Page
5 of 11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
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