ATS660LSB
Data Sheet
27627.107
Some restrictions may apply to certain types of sales. Contact factory
for details.
1
2
3
4
Pin 1 = Supply
Pin 2 = Output
Pin 3 = Internal Connection
Pin 4 = Ground
Dwg. AH-006-4
PRELIMINARY INFORMATION
(subject to change without notice)
October 20, 2000
ABSOLUTE MAXIMUM RATINGS
at T
= 25°C
A
Supply Voltage, VCC........................ 26.5 V*
Reverse Supply Voltage, V
Output OFF Voltage, V
Reverse Output Voltage, V
Continuous Output Current, I
Reverse Output Current, I
Package Power Dissipation,
PD.......................................... See Graph
Operating Temperature Range,
TA............................. -40°C to +150°C*
Junction Temperature,
(continuous), TJ.......................... +165°C
(100 hr), TJM............................... +180°C
Storage Temperature, TS................... +170°C
* Operation at increased supply voltages with
external circuitry is described in Applications
Information. Devices for operation at increased temperatures are available on special
order.
OUT
............ -24 V
RCC
................. 26.5 V
.......... -24 V
ROUT
....... 20 mA
OUT
.......... 50 mA
ROUT
TRUE ZERO-SPEED, HALL-EFFECT
ADAPTIVE GEAR-TOOTH SENSOR
The ATS660LSB is an ideal gear-tooth sensor solution for uniform
teeth targets as found in today’s demanding transmission applications.
This digital differential Hall-effect sensor is the choice when repeatability and timing accuracy count. The ATS660LSB incorporates patented
self-calibration circuitry (U.S. Pat. 5,917,320) that nulls out the effects
of installation air gap, ambient temperature, and magnet offsets to
provide superior timing accuracy with symmetrical targets over large
operating air gaps — typical of targets used in speed-sensing applications (pitches varying from below 0.5 to over 1.2 teeth per diametric
millimeter). The self-calibration at power up keeps the performance
optimized over the life of the sensor. The ATS660LSB has an opencollector output for direct digital interfacing with no further signal
processing required. This device is available in a small 9-mm diameter
by 7-mm long package for optimal manufacturing.
The integrated circuit incorporates a dual-element Hall-effect
sensor and signal processing that switches in response to differential
magnetic signals created by the ferrous gear teeth. The circuitry
contains a sophisticated digital circuit to eliminate magnet and system
offsets and to achieve true zero-speed operation . D-to-A converters are
used to adjust the device gain at power on and to allow air-gap independent switching, which greatly reduces vibration sensitivity of the
device.
FEATURES AND BENEFITS
■ Fully optimized differential digital gear-tooth sensor
■ Single-chip sensing IC for high reliability
■ High vibration immunity
■ Precise duty cycle
■ Small mechanical size (9 mm diameter x 7 mm length)
■ Automatic gain control circuitry (self calibration)
■ True zero-speed operation
■ Under-voltage lockout
■ Wide operating temperature range
■ Optimized Hall IC magnetic circuit
■ Digital signal processing
■ Large operating air gap range
■ Wide operating voltage range
■ Excellent repeatability performance
■ Defined power-on state
Always order by complete part number: ATS660LSB .
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR
FUNCTIONAL BLOCK DIAGRAM
MAGNET
Dwg. FH-019-2A
X
E1
X
E2
–
+
REF
–
+
Pin 3 must be externally connected to pin 4.
REG
SUPPLY1
32 V
UVLO
POSITIVE PEAK
DIGITAL PROC.
NEGATIVE PEAK
DIGITAL PROC.
POWER-ON
LOGIC
REFERENCE
GENERATOR
THRESHOLD
COMPARATORS
–
+
–
+
LOGIC
OUTPUT
INTERNAL
3
CONNECTION
CONTROL
CURRENT
LIMIT
<1Ω
OUTPUT
2
GROUND
4
1000
800
100 HO
600
400
200
0
ALLOWABLE PACKAGE POWER DISSIPATION IN mW
40 80 120
CO
60 100 140 18020
AMBIENT TEMPERATURE IN °C
URS M
NTINUO
US
2
AX.
R
θJA
= 147°C/W
160
Dwg. GH-065-6
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000 Allegro MicroSystems, Inc.
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR
ELECTRICAL CHARACTERISTICS at VCC = V
= 12 V and TA = +25°C (unless otherwise
OUT
noted).
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Supply Voltage V
CC
Power-On State POS VCC = 0 → 5 V HIGH* HIGH* HIGH* –
Under-Voltage Lockout V
Low Output Voltage V
Output Current Limit I
Output LeakageCurrent I
Supply Current I
Output Rise Time I
Output Fall Time I
CC(UV)
OUT(SAT)
OUTM
OFF
CC
r
f
Operating, TJ < 165°C 4.5 12 24 V
VCC = 0 → 5 V 4.1 4.2 4.3 V
I
= 20 mA – 0.2 0.4 V
OUT
25 45 55 mA
V
= 24 V – 0.2 10 µA
OUT
Output off 3.5 7.0 12 mA
Output on 5.0 8.5 14 mA
RL = 500 Ω, CL = 10 pF – 0.2 5.0 µs
RL = 500 Ω, CL = 10 pF – 0.2 5.0 µs
Power-On Time t
Zener Voltage V
on
Z
* Output transistor is OFF (high logic level).
Reference gear, <100 rpm – – 200 µs
IZT = TBD – 32 – V
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3
ATS660LSB
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR
OPERATION with reference gear at TA = +25°C.
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Air-Gap Range AG Operational 0.5 – 2.5 mm
Calibration Cycle n
Recalibration (Update) n
Minimum Speed v
Maximum Speed v
Duty Cycle Range DC 1000 rpm, 0.5 mm < AG < 2.0 mm – – ±5%
cal
rcal
min
max
Output edges before which 1 1 1 Tooth
calibration is completed
Operating 64 64 64 Teeth
Teeth (cycles) per second – 0 – kHz
Teeth (cycles) per second – 20 – kHz
REFERENCE GEAR DIMENSIONS
Limits
Characteristic Symbol Description Min. Typ. Max. Units
Diameter D
Tooth Width T – 3.0 – mm
Valley Width (pC – T) – 3.0 – mm
O
– 120 – mm
Valley Depth h
Thickness F 3.0 – – mm
4
t
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
–3.0– mm
HALL-EFFECT ADAPTIVE
TYPICAL CHARACTERISTICS
ATS660LSB
TRUE ZERO-SPEED,
GEAR-TOOTH SENSOR
12
10
8.0
6.0
4.0
SUPPLY CURRENT IN mA
2.0
0
0
5
SUPPLY VOLTAGE IN VOLTS
12
10
8.0
6.0
4.0
B > BOP
TA = 150°C
A = +25°C
T
A = -40°C
T
10
15 20 25
30
Dwg. GH-041-4
SUPPLY CURRENT IN mA
2.0
0
0
5
SUPPLY VOLTAGE IN VOLTS
10
15 20 25
B < B
TA = 150°C
A
= +25°C
T
A
= -40°C
T
RP
30
Dwg. GH-041-3
1.2
1.0
0.8
0.6
0.4
SUPPLY CURRENT IN mA
0.2
0
-30
-25
REVERSE SUPPLY VOLTAGE IN VOLTS
-20
TA = 150°C
A = +25°C
T
A = -40°C
T
-15 -10 -5.0
Dwg. GH-031-2
350
300
250
200
150
100
50
B > B
TA = 150°C
A
= +25°C
T
A
= -40°C
T
OP
OUTPUT SATURATION VOLTAGE IN mV
0
0
0
5.0
10 15 20 25
OUTPUT SINK CURRENT IN mA
Dwg. GH-059-1
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5