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ATS535JSB AND ATS535SSB PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
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
Data Sheet 27627.130
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
Dwg. AH-006-4
PRELIMINARY INFORMATION
(subject to change without notice)
April 12, 1999
ABSOLUTE MAXIMUM RATINGS
at TA = 25C Supply Voltage, VCC ........................ 26.5 V* Reverse Supply Voltage, VRCC ............ -30 V Overvoltage Supply Current, ICC ..... 100 mA Output Current, IOUT ..... Internally Limited Output OFF Voltage, VOUT ................. 26.5 V Reverse Output Current, IROUT ......... -50 mA Package Power Dissipation, PD .......................................... See Graph Operating Temperature Range, TA ATS535JSB ................ -40C to +115C ATS535SSB ................. -20C to +85C Storage Temperature, TS ................... +170C * Operation at increased supply voltages with external circuitry is described in Applications Information.
Always order by complete part number, e.g., ATS535JSB .
ATS535JSB AND ATS535SSB PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
FUNCTIONAL BLOCK DIAGRAM
1 SUPPLY
REG. PROGRAM LOGIC MAGNET OFFSET ADJUST INTERNAL CONNECTION 3 POWER-UP OUTPUT
DYNAMIC OFFSET CANCELLATION
SAMPLE & HOLD
X
LOW-PASS FILTER
2 CONTROL
CURRENT LIMIT <1 GROUND 4
Dwg. FH-020-2
FEATURES AND BENEFITS
1000
ALLOWABLE PACKAGE POWER DISSIPATION IN mW
s Chopper Stabilized for
800
600
RJA = 150C/W
s s s s s s s s s s s
400
200
0
20
40
60 100 140 80 120 AMBIENT TEMPERATURE IN C
160
180
Dwg. GH-065-3
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 s Power-On Time Wide Operating Voltage Range Defined Power-On State
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1999, Allegro MicroSystems, Inc.
ATS535JSB AND ATS535SSB PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
ELECTRICAL CHARACTERISTICS over operating voltage and temperature range (unless otherwise noted).
Limits Characteristic Supply Voltage Power-On State Low Output Voltage Output Current Limit Output Leakage Current Supply Current Symbol VCC POS V OUT(SAT) IOUTM IOFF ICC Test Conditions Operating, TJ < 165C After programming, VCC = 0 5 V IOUT = 20 mA VOUT = 12 V VOUT = 24 V Before programming, output OFF Before programming, output ON Reverse Supply Current Power-On Delay Output Rise Time Output Fall Time Clock Frequency Zener Voltage Zener Impedance IRCC ton tr tf fC VZ zz IZT = 100 A, TA = 25C IZT = 10 mA, TA = 25C VRCC = -30 V VCC > 5 V RL = 820 , CL = 20 pF RL = 820 , CL = 20 pF Min. 4.25 HIGH - 65 - - - - - - - - 27 - Typ. - HIGH 175 80 0.2 4.0 5.0 - 20 200 100 340 32 50 Max. 26 HIGH 400 95 10 7.0 8.0 -5.0 50 - - - - 100 Units V - mV mA A mA mA mA s ns ns kHz V
NOTE: Typical data is at VCC = 5 V and TA = +25C and is for design information only.
ATS535JSB AND ATS535SSB PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
TYPICAL ELECTRICAL CHARACTERISTICS
5.0
10 T A = +25C
4.0
SUPPLY CURRENT IN mA
SUPPLY CURRENT IN mA
B > B OP
V CC = 5 V
8.0
6.0 B > B OP 4.0 B < B RP 2.0
3.0 B < B RP
2.0
1.0 -50 -25 0 25 50 75 100 125 150
0 0 5 10 15 20 25
AMBIENT TEMPERATURE IN C
Dwg. GH-053-2
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-041-2
300
I OUT = 20 mA V CC = 4.5-24 V
SATURATION VOLTAGE IN mV
200
100
0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN C
Dwg. GH-040-4
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
ATS535JSB AND ATS535SSB 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.
+V
REG
X
B
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 VOUT(SAT). When the magnetic field is reduced below the release point (BRP), the device output goes high (turns OFF). The difference in the magnetic operate and release points is the hysteresis (Bhys) 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. 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
--
HALL VOLTAGE
+
DWG. FRD-903-2
+V
VCC
OUTPUT VOLTAGE
B RP
B OP
VOUT(SAT)
0 0 FLUX DENSITY +B
Dwg. GH-007-2
www.allegromicro.com
SAMPLE & HOLD
Dwg. EH-012
ATS535JSB AND ATS535SSB 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 VPP pulse, at least seven VPH pulses, and a VPP pulse with no supply interruptions, is designed to prevent the device from being programmed accidentally (for example, as a result of noise on the supply line).
VPP
PROGRAM ENABLE (AT LEAST 7 PULSES)
VPH VPL td(1) 0 td(1) td(0)
Figure 1 -- Program enable
Dwg. WH-013
PROGRAMMING PROTOCOL over operating temperature range.
Limits Characteristic Programming Voltage Symbol VPL VPH VPP Programming Current Pulse Width IPP td(0) td(1) tdP Pulse Rise Time Pulse Fall Time tr tf Max. supply current during programming OFF time between bits Enable, address, program, or lock bit ON time Program pulse ON time VPL to VPH or VPP VPH or VPP to VPL Description Minimum voltage during programming Min. 4.5 9.0 20 - 20 20 100 11 5.0 Typ. 5.0 10 23 250 - - 300 - - Max. 5.5 11 25 - - - - - - Units V V V mA s s s s s
NOTE: Typical data is at TA = +25C and is for design information only.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
ATS535JSB AND ATS535SSB 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 VPP pulse and is not reversible. Lock Programming. After the desired set point is programmed, the program lock is then activated (figure 4) to prevent further programming of the device.
ADDRESS N-2
ADDRESS N-1
td(0)
VPH VPL td(1) 0
Dwg. WH-014
Figure 2 -- Address determination
VPP
PROGRAM ENABLE
BIT 3 PROGRAM
PROGRAM ENABLE
VPH VPL td(1) 0 td(1) td(0) tdP
Figure 3 -- Set-point programming
VPP
PROGRAM ENABLE
LOCK PROGRAM (65 PULSES)
VPH VPL td(1) 0
Dwg. WH-016
td(1)
td(0)
tdP
Figure 4 -- Lock programming
* In application, the terms "gear" and "target" are often interchanged. However, "gear" is preferred when motion is transferred.
BIT 1 PROGRAM
Dwg. WH-015
ADDRESS N (UP TO 63)
ADDRESS 0
ADDRESS 1
ADDRESS 2
ATS535JSB AND ATS535SSB 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 Test Conditions JESD22-A101, TA = 85C, RH = 85% JESD22-A108, TA = 150C, TJ = 165C JESD22-A108, TA = 175C, TJ = 190C JESD22-A102, TA = 121C, 15 psig JESD22-A103, TA = 170C JESD22-A104 CDF-AEC-Q100-002 Samples Per Lot 77
Qualification Test Temperature Humidity Bias Life Bias Life
Test Length 1000 hrs
Comments Device biased for minimum power
1000 hrs
77
(Surge Operating Life)
168 hrs
77
Autoclave, Unbiased
96 hrs
77
High-Temperature (Bake) Storage Life Temperature Cycle ESD, Human Body Model
1000 hrs
77
1000 cycles Pre/Post Reading
77 3 per test
-55C to +150C Test to failure All leads > TBD
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
ATS535JSB AND ATS535SSB 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. 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 RL
OUTPUT C2 100 pF
20 R1
C1 0.033 F
SUPPLY RL
1 2 3 4
OUTPUT C2 100 pF
Vcc
2.5 k RZ 6.8 V
20 R1
C1 0.033 F
X
0.1 F CS
1
2
3
4
Vcc
Dwg. EH-008-5
X
Dwg. EH-008-4
ATS535JSB AND ATS535SSB PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
MECHANICAL INFORMATION
Component Sensor Face Plastic Housing Material Thermoset epoxy Thermoplastic PBT Function Maximum temperature 264 psi deflection temp. (DTUL) 66 psi deflection temp. (DTUL) Approximate melting temperature -- -- -- -- Units 170C* 204C 216C 225C UL94V-0 -- 8N
Flame Class Rating Leads Lead Finish Lead Pull
-- Copper 90/10 tin/lead solder plate --
* Temperature excursions to 225C 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)
Lead Cross Section (in millimeters)
0.41
0.1
0.38
A
Dwg. MH-018-2 mm
0.0076 MIN. PLATING THICKNESS
Dwg. MH-019 mm
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
ATS535JSB AND ATS535SSB PROGRAMMABLE, TRUE POWER-ON, HALL-EFFECT PROXIMITY SENSORS
DIMENSIONS IN MILLIMETERS
1.27
TYP
8.8 7.0 3 4 0.41
7.0
1 0.38
2
3.9 3.0 NOM
0.9 DIA
A
8.09 2.0 8.96
Dwg. MH-017-1B mm
Tolerances, unless otherwise specified: 1 place 0.1 mm, 2 places 0.05 mm.
ATS535JSB AND ATS535SSB 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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