ATS612LSG
DYNAMIC, SELF-CALIBRATING,
PEAK-DETECTING, DIFFERENTIAL
HALL-EFFECT GEAR-TOOTH SENSOR
The ATS612LSG gear-tooth sensor is a peak-detecting device
that uses automatic gain control to provide extremely accurate gear
edge detection down to low operating speeds. Each sensor module
consists of an over-molded package, which holds together a
samarium-cobalt magnet, a pole piece and a differential open-
collector Hall IC that has been optimized to the magnetic circuit.
This small package can be easily assembled and used in
conjunction with a wide variety of gear shapes and sizes.
The sensor incorporates a dual-element Hall IC that switches in
response to differential magnetic signals created by ferrous targets.
The sophisticated processing circuitry contains a 5-bit D/A
converter that self-calibrates (normalizes) the internal gain of the
device to minimize the effect of air-gap variations. The patented
peak-detecting filter circuit eliminates magnet and system offsets
and has the ability to discriminate relatively fast changes such as
those caused by tilt, gear wobble, and other eccentricities, yet
provides stable operation to extremely low RPM.
This sensor system is ideal for use in gathering speed, position,
and timing information using gear-tooth-based configurations. The
ATS612 is particularly suited to those applications that require
extremely accurate duty cycle control or accurate edge detection
such as in automotive crankshaft applications. The lower vibration
sensitivity also makes this device extremely useful for transmission
speed sensing.
Pin 1: Supply
Pin 2: Output
Pin 3: Capacitor
Pin 4: Ground
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
..............................….
24 V
Reverse Supply Voltage, V
RCC
.................
–16 V
Output OFF Voltage, V
OUT
.........................
24 V
Continuous Output Current, I
OUT
............
25 mA
Reverse Output Current, I
ROUT
...............
50 mA
Package Power Dissipation, P
D
......
See Graph
Operating Temperature Range,
T
A
..............................
–40°C to +150°C
°
°
Storage Temperature, T
S
......................
+170°C
°
Maximum Junction Temperature,
T
J
..................................................
165° C
°
FEATURES AND BENEFITS
Fully Optimized Differential Digital Gear-Tooth Sensor
Single-Chip Sensing IC for High Reliability
Digital Output Representing Target Profile
Extremely Low Timing Accuracy Drift with Temperature
Large Operating Air Gaps
Small Mechanical Size
Optimized Magnetic Circuit
Patented Peak-Detecting Filter:
80 µs Typical Power-On Time
<10 RPM Operation (single-tooth target)
Uses Small Value Ceramic Capacitors
Under-Voltage Lockout
Wide Operating Voltage Range
Defined Power-On State
ATS612G-DS Rev. 0a
ATS612LSG
DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT GEAR TOOTH SENSOR
Timing Diagrams
MECHANICAL PROFILE
SIG TOOTH
MAGNETIC PROFILE
SENSOR ELECTRICAL OUTPUT PROFILE
NOTE:
Output polarity is dependent upon sensor orientation and target rotation. See Output Polarity
description on page 9.
Page 2 of 15
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2001, 2003 Allegro MicroSystems, Inc.
ATS612LSG
DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT GEAR TOOTH SENSOR
ELECTRICAL CHARACTERISTICS over operating voltage and temperature range,
C
3
= 0.1 µF to 0.47 µF.
Limits
Characteristic
Supply Voltage
Power-On State
Under-Voltage Lockout
Under-Voltage Hysteresis
Low Output Voltage
Supply Zener Clamp Voltage
Output Current Limit
Output Leakage Current
Supply Current
Power-On Delay
Output Rise Time
Output Fall Time
Symbol
V
CC
POS
V
CC(UV)
V
CC(hys)
V
OUT(SAT)
V
Z
Test Condition
Operating, T
J
< 165°C
V
CC
= 0
→
5 V
V
CC
= 0
→
5 V
V
CC(UV)
– V
CC(SD)
(see NOTE below)
I
OUT
= 20 mA
I
CC
= 18 mA
V
OUT
= 12 V
V
OUT
= 24 V
Output OFF
Output ON
V
CC
> 5 V
R
L
= 500
Ω,
C
L
= 10 pF
R
L
= 500
Ω,
C
L
= 10 pF
Min.
3.6
HIGH
2.5
—
—
24
25
—
6.0
8.0
—
—
—
Typ.
—
HIGH
—
0.2
185
—
45
0.2
8.7
10.7
80
0.2
0.2
Max.
24
HIGH
3.6
—
400
—
55
15
13
15
500
5.0
5.0
Units
V
—
V
V
mV
V
I
OUTM
I
OFF
I
CC
t
on
t
r
t
f
mA
µA
mA
mA
µs
µs
µs
NOTES: Typical data is at V
CC
= 8 V and T
A
= +25°C and is for design information only.
V
CC(SD)
= shutdown voltage, V
CC
= 5 V
→
0.
Page 3 of 15
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2001, 2003 Allegro MicroSystems, Inc.
ATS612LSG
DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT GEAR TOOTH SENSOR
OPERATION over operating voltage and temperature range with reference target
(unless otherwise specified).
Limits
Characteristic
Air Gap Range
Calibration Cycle
Calibration Mode Disable
Relative Timing Accuracy,
Sequential
Allowable User Induced
Differential Offset
Symbol
AG
n
cal
n
dis
t
θ
Test Condition
Operating within specification,
Target Speed > 20 RPM
Output edges before which
Calibration is completed*
Output falling edges for startup
calibration to be complete
Target Speed = 1000 RPM,
0.4 mm
≤
AG
≤
2 mm
Output switching only; may not
meet data sheet specifications
Min.
0.4
1
64
—
—
Typ.
—
1
64
±0.3
—
Max.
2.25
1
64
±0.9
±50
Units
mm
Edge
Edges
°
G
*
Non-uniform magnetic profiles may require additional output pulses before calibration is complete.
Page 4 of 15
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2001, 2003 Allegro MicroSystems, Inc.
京公网安备 11010802033920号
EEWORLD
