ATS671LSE Specification
Preliminary Subject to Change
Pin Out Diagram
Self Calibrating TPOS Gear Tooth Sensor with
9Bit Signal Capture
Pin 1: V
CC
Pin 2: V
OUT
Pin 3: Test Pin (Tie to GND)
Pin 4: Gnd
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
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,
JA
.SB. . . . . . . . . . . . . . . . . . . ~150
°
C/W
Maximum Junction Temperature,
T
Jmax
. . . . . . . . . . . . . . . . . . . . . . . . . 170
°
C
Maximum Junction Temperature 100 Hours,
T
Jmax
. . . . . . . . . . . . . . . . . . . . . . . . . 180
°
C
FEATURES
s
Tight timing accuracy over temperature
s
True zero speed operation
s
True power on state
s
Air gap independent switch points
s
High vibration immunity
s
Large operating air gaps
s
Operation down to 3.3V
s
Digital output representing target profile
s
Single chip solution for high reliability
s
Small mechanical size
s
Optimized Hall IC magnetic system
s
AGC and reference adjust circuit
s
Under-voltage lockout
ATS671LSE
SELF CALIBRATING TPOS GEAR TOOTH SENSOR WITH 9BIT SIGNAL CAPTURE
Preliminary Subject to Change
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.
OPERATING CHARACTERISTICS
Valid at T
a
= -40C to 150C and power supply within specification unless
otherwise noted
Limits
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
ELECTRICAL CHARACTERISTICS
Supply Voltage
V
CC
Operating; Tj < Tjmax
3.3
26.5
V
Reverse Supply Voltage
V
RCC
I
RCC
= -5mA (max)
-18
V
Supply Zener Clamp Voltage
V
Z
28
33
37
V
Supply Zener Current
I
Z
Tj < Tjmax; pulsed
100
mA
Output = OFF
3
6.5
11
mA
Supply Current
I
CC
Output = ON
3
6.5
11
mA
POWER-ON STATE CHARACTERISTICS
Power Up Time
t
PO
Gear Speed < 100 RPM; Vcc> 3.3V
-
500
uS
Under Voltage Lockout
V
UV
-
<Vcc
Min
V
OUTPUT STAGE
Low Output Voltage
V
LOUT
I
SINK
= 15 mA, Output = ON
-
0.2
0.45
V
Output Current Limit
I
lin
Output = ON, Tj < Tjmax
25
45
70
mA
Output Leakage Current
I
OFF
Output = OFF, V
OUT
= Vcc
(Max)
-
10
µ
A
Output Rise Time
t
r
R
L
= 500
, C
L
= 10 pF, T
a
= 25C
-
0.9
5
µ
s
Output Fall Time
t
f
R
L
= 500
, C
L
= 10 pF, T
a
= 25C
-
0.5
5
µ
s
Time
[Seconds]
Output High
Output Low
100%
Rise and Fall Time
10%
90%
t
r
90%
10%
t
f
ATS671LSE
SELF CALIBRATING TPOS GEAR TOOTH SENSOR WITH 9BIT SIGNAL CAPTURE
Preliminary Subject to Change
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.
Limits
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
SWITCH POINT CHARACTERISTICS
Tooth Speed
S
max
0
8
KHz
Bandwidth
f-3db
40
KHz
Operate Point
Bop%
% of peak to peak referenced to tooth
signal, AG < Agmax;
+40
%
Release Point
Brp%
% of peak to peak referenced to tooth
signal, AG < Agmax;
+50
%
Over Valley
HIGH
Output Polarity
Vout
Over Tooth
LOW
Calibration
Initial Calibration
C
I
Number of Rising Mechanical Edges for
Accurate Edge Detection
3
Edges
AGC Disable
C
f
Number of Rising Mechanical Edges
Required to Complete AGC Calibration
3
Edges
Tooth Signal
Valley Signal
100%
Brp%
Bop%
Brp%
Bop%
Switchpoints
ATS671LSE
SELF CALIBRATING TPOS GEAR TOOTH SENSOR WITH 9BIT SIGNAL CAPTURE
Preliminary Subject to Change
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.
OPERATION WITH 8X Reference Target over Operational Air Gap and Temperature with Test Circuit #1 Unless
Otherwise Stated
Limits
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
T
ICRel
Rising and Falling Edge, RPM = 1000
During Initial Calibration
Gear Eccentricity < 0.1mm
3
6
°
T
Rel
Rising Mechanical Edge
After Initial Calibration, RPM = 1000
Gear Eccentricity < 0.1mm
-
0.5
0.8
°
1
Relative Timing Accuracy
T
Rel
Falling Mechanical Edge
After Initial Calibration, RPM = 1000
Gear Eccentricity < 0.1mm
-
0.8
1.2
°
2
TPOS Air Gap Min
AG
Min
Valleys May be Detected as Teeth:
Incorrect TPOS
-
-
0.5
mm
3
TPOS Air Gap Range
AG
TPOS
Distance for Correct TPOS Functionality
0.5
-
2.5
mm
4
TPOS Air Gap Max
AG
Max
Teeth May be Detected as a Valley:
Incorrect TPOS
2.5
-
5.0
mm
Operational Air Gap Range
AG
Output Switching: Running Mode Only
0.5
-
2.5
mm
Edge Repeatability
t
E
360° Repeatability, 1000 edges
0.04
°
1
Relative Timing Accuracy Range is the change in edge position over the operational air gap and temperature range.
2
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.
ATS671LSE
SELF CALIBRATING TPOS GEAR TOOTH SENSOR WITH 9BIT SIGNAL CAPTURE
Preliminary Subject to Change
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.
Rise and Fall Time
Target
Relative Timing Accuracy
Device Output
T
AbsRise
(Max - Min)
T
AbsFall
(Max - Min)
Tooth
Operational Air Gap
Valley
Air Gap
Target
Absolute Timing Accuracy
Device Output
T
AbsRise
T
AbsFall
T
AbsFall
(Max - Min)
Tooth
TPOS Air Gap
Valley
TPOS Air Gap
Min
TPOS Air Gap
Range
TPOS Air Gap
Max
Output Rise Time: R=500Ohms C=10pF
Output Fall Time: R = 500Ohms C = 10pF
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