Datasheet ATS535JSB Datasheet (ALLEGRO)

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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
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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
<1
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.
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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 , C
L
R
= 820 , C
L
I
= 100 µA, TA = 25°C2732V
ZT
IZT = 10 mA, T
= 20 pF 200 ns
L
= 20 pF 100 ns
L
= 25°C 50 100
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.
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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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ATS535JSB AND A TS535SSB
PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
FUNCTIONAL DESCRIPTION
Chopper-Stabilized Technique. These devices use a
proprietary dynamic offset cancellation technique, with an internal high-frequency clock to reduce the residual offset voltage of the Hall element that is normally caused by device overmolding, temperature dependencies, and thermal stress. This technique produces devices that have an extremely stable quiescent Hall output voltage, are immune to thermal stress, and have precise recoverability after temperature cycling. This technique will also slightly degrade the device output repeatability.
The Hall element can be considered as a resistor array similar to a Wheatstone bridge. A large portion of the offset is a result of the mismatching of these resistors. The chopper-stabilizing technique cancels the mismatching of the resistors by changing the direction of the current flowing through the Hall plate and Hall voltage measure­ment taps, while maintaining the Hall-voltage signal that is induced by the external magnetic flux. The signal is, then, captured by a sample-and-hold circuit.
Operation. The output of these devices switches low (turns ON) when a magnetic field (south pole) perpendicu­lar to the Hall sensor exceeds the operate point threshold (BOP). After turn-ON, the output is capable of sinking 25 mA and the output voltage is V
OUT(SAT)
netic field is reduced below the release point (B
. When the mag-
), the
RP
device output goes high (turns OFF). The difference in the magnetic operate and release points is the hysteresis (B
hys
of the device. This built-in hysteresis allows clean switch­ing of the output even in the presence of external mechani­cal vibration and electrical noise.
Applications. It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor) between the supply and ground of the device to reduce both external noise and noise generated by the chopper-stabilization technique.
REG
& HOLD
SAMPLE
X
B
+V
Dwg. EH-012
HALL VOLTAGE
+
DWG. FRD-903-2
+V
V
CC
OUTPUT VOLTAGE
B
RP
B
OP
)
V
OUT(SAT)
0
0
FLUX DENSITY
+B
Dwg. GH-007-2
Many other methods of operation are possible. Exten­sive applications information on magnets and Hall-effect sensors is also available in the Allegro Electronic Data Book AMS-702 or Application Note 27701, or
www.allegromicro.com
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ATS535JSB AND A TS535SSB
PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
PROGRAMMING PROTOCOL
The ATS535JSB and ATS535SSB operate points are programmed by serially addressing the device through the supply terminal (pin1). After the correct operate point is determined, the device programming bits are selected and then a “lock” set to prevent any further (accidental) programming.
Program Enable. To program the device, a sequence of pulses is used to activate/enable the addressing mode as shown in figure 1. This sequence of a V seven V
pulses, and a VPP pulse with no supply interrup-
PH
tions, is designed to prevent the device from being pro­grammed accidentally (for example, as a result of noise on the supply line).
pulse, at least
PP
V
PP
V
PH
V
PL
t
d(1)
0
PROGRAM ENABLE
(AT LEAST 7 PULSES)
t
d(1)
t
d(0)
Dwg. WH-013
Figure 1 — Program enable
PROGRAMMING PROTOCOL over operating temperature range.
Limits
Characteristic Symbol Description Min. Typ. Max. Units
Programming Voltage V
Programming Current I
Pulse Width t
Pulse Rise Time t
Pulse Fall Time t
V
V
t
PH
PP
PP
d(0)
d(1)
t
dP
PL
r
f
NOTE: Typical data is at TA = +25°C and is for design information only.
Minimum voltage during programming 4.5 5.0 5.5 V
9.0 10 11 V
20 23 25 V
Max. supply current during programming 250 mA
OFF time between bits 20 µs
Enable, address, program, or lock bit ON time
20 µs
Program pulse ON time 100 300 µs
VPL to VPH or V
VPH or VPP to V
PP
PL
11 µs
5.0 µs
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
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ATS535JSB AND A TS535SSB
PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
Address Determination. The operate point is adjust­able in 64 increments. With the appropriate target or gear* in position, the 64 switch points are sequentially selected (figure 2) until the required operate point is reached. Note that the difference between the operate point and the release point (hysteresis) is a constant for all addresses.
Set-Point Programming. After the desired set-point address is determined (0 through 63), each bit of the equivalent binary address is programmed individually. For example, as illustrated in figure 3, to program address code 5 (binary 000101), bits 1 and 3 need to be programmed. Each bit is programmed during the wide V
Lock Programming. After the desired set point is programmed, the program lock is then activated (figure 4) to prevent further programming of the device.
pulse and is not reversible.
PP
ADDRESS N-2
ADDRESS 0
ADDRESS 1
V
PH
V
PL
0
ADDRESS 2
t
d(1)
ADDRESS N-1
ADDRESS N
t
d(0)
Dwg. WH-014
(UP TO 63)
Figure 2 — Address determination
V
PP
V
PH
V
PL
0
t
d(1)
PROGRAM ENABLE
t
d(1)
BIT 3 PROGRAM
t
d(0)
Figure 3 — Set-point programming
V
PP
V
PH
V
PL
0
t
PROGRAM ENABLE LOCK PROGRAM
t
d(1)
d(1)
t
d(0)
Figure 4 — Lock programming
* In application, the terms “gear” and “target” are often interchanged. However, “gear” is preferred when motion is transferred.
PROGRAM ENABLE
BIT 1 PROGRAM
t
dP
Dwg. WH-015
(65 PULSES)
t
dP
Dwg. WH-016
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ATS535JSB AND A TS535SSB
PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
CRITERIA FOR DEVICE QUALIFICATION
All Allegro sensors are subjected to stringent qualification requirements prior to being released to production. To become
qualified, except for the destructive ESD tests, no failures are permitted.
Test Method and Samples
Qualification Test Test Conditions Test Length Per Lot Comments
Temperature Humidity JESD22-A101, 1000 hrs 77 Device biased for Bias Life T
Bias Life JESD22-A108, 1000 hrs 77
(Surge Operating Life) JESD22-A108, 168 hrs 77
Autoclave, Unbiased JESD22-A102, 96 hrs 77
= 85°C, RH = 85% minimum power
A
T
= 150°C, TJ = 165°C
A
T
= 175°C, TJ = 190°C
A
T
= 121°C, 15 psig
A
High-Temperature JESD22-A103, 1000 hrs 77 (Bake) Storage Life T
Temperature Cycle JESD22-A104 1000 cycles 77 -55°C to +150°C
ESD, CDF-AEC-Q100-002 Pre/Post 3 per Test to failure Human Body Model Reading test All leads > TBD
= 170°C
A
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
Page 9
ATS535JSB AND A TS535SSB
312
4
3
124
PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
APPLICATIONS INFORMATION
Operation From a Regulated Power Supply. These
devices require minimal protection circuitry during operation from a low-voltage regulated line. The on-chip voltage regulator provides immunity to power supply variations between 4.25 V and 26 V. However, even while operating from a regulated line, some supply and output filtering is required to provide immunity to coupled and injected noise on the supply line. A basic RC low-pass circuit (R1C1) on the supply line and an optional output capacitor (C2) is recommended for operation in noisy environments. Because the device has an open-collector output, an output pull-up resistor (RL) must be included either at the sensor output (pin 2) or by the signal proces­sor input.
SUPPLY
20
R
L
C
R
1
0.033 µF
1
Vcc
OUTPUT
C
100 pF
2
Operation From an Unregulated Power Supply. In automotive applications, where the device receives its power from an unregulated supply such as the battery, full protection is generally required so that the device can withstand the many supply-side transients. Specifications for such transients vary between car manufacturers, and protection-circuit design should be optimized for each application. In the circuit below, a simple Zener­controlled regulator is constructed using discrete compo­nents. The RC low-pass filter on the supply line (R1C1) and a low-value supply bypass capacitor (CS) can be included, if necessary, so as to minimize susceptibility to EMI/RFI. The npn transistor should be chosen with sufficiently high forward breakdown voltage so as to withstand supply-side transients. The series diode should be chosen with sufficiently high reverse breakdown capabilities so as to withstand the most negative transient. The current-limiting resistor (RZ) and the Zener diode should be sized for power dissipation requirements.
SUPPLY
R
L
OUTPUT
C
100 pF
2
6.8 V
20
R
1
2.5 k
R
X
Dwg. EH-008-5
0.1 µF C
Z
S
C
1
0.033 µF
Vcc
X
Dwg. EH-008-4
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ATS535JSB AND A TS535SSB
A
PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
MECHANICAL INFORMATION
␣Component Material Function Units
␣Sensor Face Thermoset epoxy Maximum temperature 170°C* ␣Plastic Housing Thermoplastic PBT 264 psi deflection temp. (DTUL) 204°C
66 psi deflection temp. (DTUL) 216°C Approximate melting temperature 225°C
␣Flame Class Rating UL94V-0
␣Leads Copper
␣Lead Finish 90/10 tin/lead solder plate
␣Lead Pull 8 N
* Temperature excursions to 225°C for 2 minutes or less are permitted. † All industry-accepted soldering techniques are permitted for these subassemblies provided the indicated maximum temperature for each component (e.g., sensor face, plastic housing) is not exceeded. Reasonable dwell times, which do not cause melting of the plastic housing, should be used.
Sensor Location (in millimeters)
(sensor location relative to package center is the design objective)
0.1
Dwg. MH-018-2 mm
Lead Cross Section (in millimeters)
0.41
0.38
0.0076 MIN. PLATING THICKNESS
Dwg. MH-019 mm
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
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ATS535JSB AND A TS535SSB
A
PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
DIMENSIONS IN MILLIMETERS
DIA
8.8
7.0
7.0
2.0
3.0
NOM
0.38
1.27
TYP
1 2 3 4
0.41
0.9
Tolerances, unless otherwise specified: 1 place ±0.1 mm, 2 places ±0.05 mm.
3.9
8.968.09
Dwg. MH-017-1B mm
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ATS535JSB AND A TS535SSB
PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibil­ity for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
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