ATS665LSG.pdf

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ATS665LSG
PRELIMINARY INFORMATION
(subject to change without notice)
September 16, 2002
TRUE ZERO-SPEED, HALL-EFFECT
ADAPTIVE GEAR-TOOTH SENSOR
1
The ATS665LSG is an optimized Hall IC/magnet configuration
packaged as a molded module that provides a user-friendly solution for
digital gear-tooth-sensing applications. This digital differential Hall-
effect sensor is the choice when repeatability and timing accuracy
count. The module incorporates patented self-calibration circuitry 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 automotive transmission applications. The self-calibration at
power up keeps the performance optimized over the life of the sensor.
The ATS665LSG has an open-collector output for direct digital inter-
facing with no further signal processing required.
The integrated circuit incorporates a dual-element Hall-effect
sensor and signal processing that switches in response to differential
magnetic signals created by a ferrous target. The circuitry contains a
sophisticated digital circuit to reduce the detrimental effects of magnet
and system offsets and to achieve true zero-speed operation. Digital
processing of the analog signal provides zero-speed performance
independent of air gap and also dynamic adaptation of device perfor-
mance to the typical operating conditions found in automotive applica-
tions (reduced vibration sensitivity). High-resolution, peak-detecting
DACs are used to set the switching thresholds; hysteresis reduces the
negative effects of any anomalies in the magnetic signal associated with
the target.
2
3
4
Pin 1 = Supply
Pin 2 = Output
Pin 3 = Test
Pin 4 = Ground
Dwg. AH-013
ABSOLUTE MAXIMUM RATINGS
at T A = 25
C
Supply Voltage, V CC ........................... 26.5 V
Reverse Supply Voltage, V RCC ............ -18 V
Output OFF Voltage, V OUT ................. 26.5 V
Reverse Output Voltage, V ROUT .......... -18 V
Continuous Output Current, I OUT ....... 20 mA
Reverse Output Current, I ROUT ......... -50 mA
Package Power Dissipation,
P D .......................................... See Graph
Operating Temperature Range,
T A ............................. -40
FEATURES & BENEFITS
True zero-speed operation
Air-gap independent switch points
High vibration immunity
Precise duty cycle over temperature
Large operating air gap range
Defined power-on state
Wide operating voltage range
Digital output representing target profile
C to +160
C*
Single-chip sensing IC for high reliability
Small mechanical size (8 mm diameter x 5.5 mm length)
Junction Temperature,
(continuous), T J .......................... +170
Optimized Hall IC magnetic circuit
C
Short power up time
(100 hr), T JM ............................... +185
C
AGC and reference adjust circuit
C
* Devices for operation at increased tempera-
tures are available on special order.
Undervoltage lockout
Always order by complete part number: ATS665LSG .
Storage Temperature, T S ................... +170
420959571.023.png 420959571.024.png
ATS665LSG
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR
FUNCTIONAL BLOCK DIAGRAM
1
SUPPLY
3
TEST
32 V
POWER-ON
LOGIC
REG
UVLO
X
E1
–
+
THRESHOLD
COMPARATORS
–
+
POSITIVE PEAK
DIGITAL PROC.
–
+
MAGNET
OUTPUT
REF
X
2
E2
CONTROL
–
+
NEGATIVE PEAK
DIGITAL PROC.
CURRENT
LIMIT
<1
GROUND
4
Dwg. FH-019-4
1000
800
R θ
JA = 126°C/W
600
R θ JA is measured on typical two-
sided PCB with minimal copper
ground area. R θ
JA can be
C/W with 1
square inch copper ground area
at pin 4 or to 86
400
C/W with 3.5
square inch copper ground area
at pin 4.
200
0
20
40
60
80
100
120
140
160
180
AMBIENT TEMPERATURE IN °C
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2002 Allegro MicroSystems, Inc.
reduced to 95
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ATS665LSG
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR
ELECTRICAL CHARACTERISTICS over operating voltage and temperature ranges (unless
otherwise noted).
Limits
Characteristic
Symbol
Test Conditions
Min. Typ. Max.
Units
Supply Voltage
V CC
Operating, T J < 170
C
3.3
12
24
V
Power-On State
POS
V CC = 0
5 V
HIGH* HIGH* HIGH*
–
Undervoltage Lockout
V CC(UV)
V CC = 0
5 V
–
–
3.3
V
Low Output Voltage
V OUT(SAT)
I OUT = 20 mA
–
200
400
mV
Output Current Limit
I OUTM
V OUT = 12 V
25
45
70
A
Output LeakageCurrent
I OFF
V OUT = 24 V
–
–
10
A
Supply Current
I CC
Output off
–
8.2
15
mA
Output on
–
8.2
15
mA
Reverse Supply Current
I RCC
V CC = -18 V
–
–
-10
mA
Output Rise Time
I r
R L = 500
, C L = 10 pF
–
1.0
2.0
s
Output Fall Time
I f
R L = 500
, C L = 10 pF
–
0.6
2.0
s
Power-On Time
t on
Reference gear, <100 rpm
–
–
200
s
Zener Voltage
V Z
I ZT = TBD
26.5
32
38
V
* Output transistor is off (high logic level).
www.allegromicro.com
3
420959571.014.png
ATS665LSG
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR
OPERATION with reference gear over operating voltage and temperature ranges.
Limits
Characteristic
Symbol
Test Conditions
Min. Typ. Max.
Units
Air-Gap Range
AG
Operational
0.5
–
2.5
mm
Calibration Cycle
n cal
Output edges before which
3
3
3
Teeth
calibration is completed
Recalibration (Update)
n rcal
Operating
Continuous
Teeth
Minimum Speed
v min
–
0
–
rpm
Maximum Speed
v max
12000*
–
–
rpm
Bandwidth
f max
-3 dB
20*
–
–
kHz
Operate Point
B OP%
% of peak-to-peak signal, output high to low†
–
70
–
%
Release Point
B RP%
% of peak-to-peak signal, output low to high†
–
30
–
%
Duty Cycle Range
DC
1000 rpm, 0.5 mm < AG < 2.5 mm
43
48
53
%
Operating Signal
–
Bmax - Bmin
60
–
–
G
* Operation at a frequency (teeth per second) greater than the specified minimum value is possible but not warranteed.
† See switching references figure, page 11.
60-0 REFERENCE TARGET/GEAR DIMENSIONS (low carbon steel)
Limits
Characteristic
Symbol
Description
Min. Typ. Max.
Units
Diameter
D O
–
120
–
mm
Tooth Width
T
–
3.0
–
mm
Valley Width
(p C – T)
–
3.0
–
mm
Valley Depth
h t
–
3.0
–
mm
Thickness
F
–
6.0
–
mm
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
420959571.015.png
ATS665LSG
TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR
TYPICAL CHARACTERISTICS
12
12
10
10
8.0
8.0
6.0
6.0
4.0
B > B OP
4.0
B< B RP
T A = 150°C
T A = +85°C
T A = +25°C
T A = 0°C
T A = -40°C
T A = 150°C
T A = +85°C
T A = +25°C
T A = 0°C
T A = -40°C
2.0
2.0
0
0
5
10
15
20
25
30
0
0
5
10
15
20
25
30
SUPPLY VOLTAGE IN VOLTS
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-041-5
Dwg. GH-041-6
300
250
I OUT = 20 mA
V CC = 4.25–26 V
200
150
100
50
0
-50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN °C
Dwg. GH-040-6
www.allegromicro.com
5
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