ATS672LSB
Preliminary – Subject to Change
PIN OUT DIAGRAM
Self-Calibrating TPO Gear-Tooth Sensor with
9-Bit Signal Capture
The ATS672LSB 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 small 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 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. 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).
The ATS672LSB 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
ATS672LSB sensor system is optimized for cam applications.
Four versions of this device are available. The sensor can be
chosen to have a high or low output signal in response to a “tooth”.
The sensor is also available with and without TPOS (true power on
state) capability. The low-on-tooth sensor without TPOS is
available through general sales. (Part # ATS672LSB-LN). For
other versions please contact the factory. Some restrictions may
apply.
4321
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
. . . . . . . . . . . . . . . . . . . . . . . . . . 28 V
Reverse Supply Voltage,
V
R
. . . . . . . . . . . . . . . . . . . . . . . . . . . . –18 V
Reverse Current Through Output,
I
R
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA
Continuous Output Current,
I
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Storage Temperature,
T
S
. . . . . . . . . . . . . . . . . . . . . . . . . . . 170° C
Package Power Rating,
R
θJA
. . . . . . . . . . . . . . . . . . . ~150°C/W
Maximum Junction Temperature,
T
Jmax
. . . . . . . . . . . . . . . . . . . . . . . . . 170° C
Maximum Junction Temperature – 100 Hours,
T
Jmax
. . . . . . . . . . . . . . . . . . . . . . . . . 180° C
FEATURES
Tight timing accuracy over temperature
True zero-speed operation
True power-on sensing
Air gap independent switch points
High vibration immunity
Large operating air gaps
Operation down to 3.3 V
Digital output representing target profile
Single-chip solution for high reliability
Small mechanical size
Optimized Hall IC magnetic system
AGC and reference-adjust circuit
Undervoltage lockout
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
OPERATING CHARACTERISTICS
Valid at T
A
= -40°C to +150°C and power supply within specification unless
otherwise noted
Characteristics
Symbol
Test Conditions
Limits
Min.
3.3
28
Tj < Tjmax; pulsed
Output = off
Output = on
Gear Speed < 100 rpm; Vcc> 3.3 V
3.0
3.0
-
-
I
OUT
= 15 mA, Output = on
Output = ON, Tj < Tjmax
Output = off, V
OUT
= Vcc
(Max)
R
L
= 500
Ω,
C
L
= 10 pF, T
A
= 25°C
R
L
= 500
Ω,
C
L
= 10 pF, T
A
= 25°C
-
25
-
-
-
0.9
0.5
0.2
45
6.5
6.5
33
Typ.
Max.
26.5
-18
37
100
11
11
500
<Vcc
Min
0.45
70
10
5.0
5.0
Units
V
V
V
mA
mA
mA
µs
V
V
mA
µA
µs
µs
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
Operating; T
J
< T
J
max
I
RCC
= -5 mA (max)
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
OUT
I
lin
I
OFF
t
r
t
f
t
PO
V
UV
Rise and Fall Time
Output High
90%
90%
100%
10%
10%
t
r
t
f
Output Low
Time
[Seconds]
Rev. 1.2 May 1, 2002
Page
2 of 12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
Characteristics
Symbol
Test Conditions
Limits
Min.
0
40
Typ.
Max.
8.0
Units
kHz
kHz
%
%
SWITCH POINT CHARACTERISTICS
Tooth Speed
Bandwidth
Operate Point
Release Point
S
max
f-3db
Bop%
Brp%
% of peak to peak referenced to tooth
signal, AG < Agmax;
% of peak to peak referenced to tooth
signal, AG < Agmax;
Over valley
Over tooth
Over valley
Over tooth
+30
+40
HIGH
LOW
LOW
HIGH
Output Polarity
ATS672LSB-LN (no TPOS)
V
OUT
ATS672LSB-LT (with TPOS)*
Output Polarity
ATS672LSB-HN (no TPOS)*
V
OUT
ATS672LSB-HT (with TPOS)*
* Restrictions on availability may apply.
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
Switchpoints
Tooth Signal
Bop%
Brp%
Bop%
Brp%
Valley Signal
100%
Rev. 1.2 May 1, 2002
Page
3 of 12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
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
Rising and falling edge, RPM = 1000
3.0
6.0
°
t
ICRel
during initial calibration
gear eccentricity < 0.1 mm
Rising mechanical edge
1
Relative Timing Accuracy
t
Rel
after initial calibration, RPM = 1000
-
0.3
0.6
°
gear eccentricity < 0.1 mm
Falling mechanical edge
t
Rel
-
0.5
0.8
°
after initial calibration, RPM = 1000
gear eccentricity < 0.1 mm
Rising mechanical edge
t
AbsRise
-
-0.2
-
°
air gap: 1.5mm, temperature: 25°C
RPM: 1000
2
Absolute Timing Accuracy
Falling mechanical edge
t
AbsFall
-
+0.6
-
°
air gap: 1.5mm, temperature: 25°C
RPM: 1000
x 10
-5
°
After initial calibration
3
-
6.66
-
Phase Delay
t
RelSpeed
air gap: 1.5 mm, temperature: 25°C
/ RPM
4
Valleys may be detected as teeth:
TPOS Air Gap Min
-
-
0.5
mm
AG
Min
incorrect TPOS
ATS672LSB – LT and HT
TPOS Air Gap Range
ATS672LSB – LT and HT
TPOS Air Gap Max
ATS672LSB – LT and HT
Operational Air Gap Range
Edge Repeatability
6
5
AG
TPOS
AG
Max
AG
t
θE
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
2.25
0.5
-
-
-
0.04
2.25
5.0
2.25
mm
mm
mm
°
1
Relative Timing Accuracy Range is the change in edge position over the operational air gap and temperature range that
can be expected from a single device. This does not include part-to-part variation.
2
The Typical Absolute Timing Accuracy is the difference between the target mechanical edge (rising or falling) and the
corresponding sensor electrical edge.
Phase Delay is the change in edge position over the operational RPM range that can be expected from a single device.
This does not include part-to-part variation or variation due to temperature.
4
3
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.
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.
5
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. 1.2 May 1, 2002
Page
4 of 12
6
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT 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
Phase Delay with RPM
Phase Delay [°]
0
RPM
Max RPM
Rev. 1.2 May 1, 2002
Page
5 of 12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
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