ALLEGRO ATS535JSB User Manual
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ATS535JSB AND A TS535SSB
PROGRAMMABLE, TRUE
POWER-ON, HALL-EFFECT
PROXIMITY SENSORS
PROGRAMMABLE, TRUE POWER-ON,
HALL-EFFECT PROXIMITY SENSORS
1
2
3
4
Pin 1 = Supply
Pin 2 = Output
Pin 3 = Internal Connection
Pin 4 = Ground
PRELIMINARY INFORMATION
(subject to change without notice)
April 12, 1999
ABSOLUTE MAXIMUM RATINGS
at T
= 25°C
A
Supply Voltage, VCC........................ 26.5 V*
Reverse Supply Voltage, V
Overvoltage Supply Current, ICC..... 100 mA
Output Current, I
Output OFF Voltage, V
Reverse Output Current, I
Package Power Dissipation,
PD.......................................... See Graph
Operating Temperature Range, T
ATS535JSB................ -40°C to +115°C
ATS535SSB ................. -20°C to +85°C
Storage Temperature, TS................... +170°C
* Operation at increased supply voltages with
external circuitry is described in Applications
Information.
OUT
RCC
..... Internally Limited
................. 26.5 V
OUT
ROUT
Dwg. AH-006-4
............ -30 V
......... -50 mA
A
ATS535JSB
AND
ATS535SSB
The ATS535JSB and ATS535SSB programmable, true power-on
(TPOS), proximity sensors are optimized Hall-effect IC/magnet combinations that provide power-on tooth/valley recognition in large geartooth sensing applications and proximity detection in other applications.
Each sensor subassembly consists of a high-temperature plastic shell
that holds together a samarium-cobalt magnet, a pole piece, and a single
element, chopper-stabilized Hall-effect IC that can be programmed to
match the magnetic circuit, optimizing sensor airgap and timing accuracy performance after final packaging. The small package can be
easily assembled and used in conjunction with a wide variety of gear/
target shapes and sizes. The two devices differ only in operating
temperature range.
The sensing technology used for this sensor subassembly is Halleffect based. The sensor incorporates a single-element Hall IC that
switches in response to magnetic signals created by a ferrous target.
The circuit eliminates magnet and system offsets such as those caused
by tilt yet provides zero-speed detection capabilities without the associated running jitter inherent in classical digital solutions.
A proprietary dynamic offset cancelation technique, with an
internal high-frequency clock, reduces the residual offset voltage,
which is normally caused by device overmolding, temperature
dependancies, and thermal stress. This technique produces devices that
have an extremely stable quiescent output voltage, are immune to
mechanical stress, and have precise recoverability after temperature
cycling. Many problems normally associated with low-level analog
signals are minimized by having the Hall element and amplifier in a
single chip. Output precision is obtained by internal gain adjustments
during the manufacturing process and operate-point programming in the
user’s application.
This sensor system is ideal for use in gathering speed, position, and
timing information using gear-tooth-based configurations. The
ATS535JSB/SSB are particularly suited to those applications that
require accurate duty cycle control or accurate edge detection. The
lower vibration sensitivity also makes these devices extremely useful
for transmission speed sensing.
Continued next page
Always order by complete part number, e.g., ATS535JSB .
Data Sheet
27627.130
ATS535JSB AND A TS535SSB
1
234
PROGRAMMABLE, TRUE
POWER-ON, HALL-EFFECT
PROXIMITY SENSORS
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
REG.
MAGNET
X
DYNAMIC
OFFSET CANCELLATION
1000
800
R
θJA
600
400
200
0
ALLOWABLE PACKAGE POWER DISSIPATION IN mW
60 100 140 18020
40 80 120
AMBIENT TEMPERATURE IN °C
= 150°C/W
& HOLD
SAMPLE
160
Dwg. GH-065-3
PROGRAM
FILTER
LOW-PASS
LOGIC
OFFSET
ADJUST
POWER-UP
CONTROL
CURRENT
LIMIT
<1Ω
INTERNAL
CONNECTION
GROUND
Dwg. FH-020-2
FEATURES AND BENEFITS
■ Chopper Stabilized for
Extremely Low Switch-Point Drift and
Immunity to Mechanical Stress
■ Externally Programmed Switch Point
■ On-Chip Supply-Transient Protection
■ Output Short-Circuit Protection
■ True Zero-Speed Operation
■ High Vibration Immunity
■ Single-Chip Sensing IC for High Reliability
■ Small Mechanical Size
■ Optimized Magnetic Circuit
■ <50 µs Power-On Time
■ Wide Operating Voltage Range
■ Defined Power-On State
OUTPUT
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1999, Allegro MicroSystems, Inc.
ATS535JSB AND A TS535SSB
PROGRAMMABLE, TRUE
POWER-ON, HALL-EFFECT
PROXIMITY SENSORS
ELECTRICAL CHARACTERISTICS over operating voltage and temperature range (unless
otherwise noted).
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Supply Voltage V
CC
Operating, T
< 165°C 4.25 – 26 V
J
Power-On State POS After programming, V
Low Output Voltage V
OUT(SAT)
Output Current Limit I
Output Leakage Current I
Supply Current I
OUTM
OFF
CC
I
= 20 mA – 175 400 mV
OUT
V
= 12 V 65 80 95 mA
OUT
V
= 24 V – 0.2 10 µA
OUT
Before programming, output OFF – 4.0 7.0 mA
Before programming, output ON – 5.0 8.0 mA
Reverse Supply Current I
Power-On Delay t
Output Rise Time t
Output Fall Time t
Clock Frequency f
Zener Voltage V
Zener Impedance z
RCC
on
r
f
C
Z
z
V
= -30 V – – -5.0 mA
RCC
V
> 5 V – 20 50 µs
CC
R
= 820 Ω, C
L
R
= 820 Ω, C
L
I
= 100 µA, TA = 25°C2732–V
ZT
IZT = 10 mA, T
= 20 pF – 200 – ns
L
= 20 pF – 100 – ns
L
= 25°C – 50 100 Ω
A
= 0 → 5 V HIGH HIGH HIGH –
CC
– 340 – kHz
NOTE: Typical data is at VCC = 5 V and TA = +25°C and is for design information only.
ATS535JSB AND A TS535SSB
PROGRAMMABLE, TRUE
POWER-ON, HALL-EFFECT
PROXIMITY SENSORS
TYPICAL ELECTRICAL CHARACTERISTICS
5.0
4.0
3.0
2.0
SUPPLY CURRENT IN mA
1.0
-50
B > B
0255075
AMBIENT TEMPERATURE IN °C
300
10
T = +25°C
A
V = 5 V
100
CC
125-25
150
Dwg. GH-053-2
OP
B < B
RP
8.0
6.0
4.0
SUPPLY CURRENT IN mA
2.0
0
0
5
SUPPLY VOLTAGE IN VOLTS
B > B
OP
B < B
RP
10 15 20 25
Dwg. GH-041-2
I = 20 mA
OUT
V = 4.5–24 V
CC
200
100
SATURATION VOLTAGE IN mV
0
-50
-25
0255075
AMBIENT TEMPERATURE IN °C
100
150
125
Dwg. GH-040-4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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