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

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 [phone]
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 [phone]

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

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 [phone]

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

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 [phone]

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 Ω

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 Ω

R

1

2.5 kΩ

R

X

Dwg. EH-008-5

0.1 µF
C

Z

S

C

1

0.033 µF

Vcc

X

Dwg. EH-008-4

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 [phone]

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

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 [phone]