Allegro ATS660LSB Datasheet

ATS660LSB

Data Sheet

27627.107

Some restrictions may apply to cer­tain types of sales. Contact factory
for details.

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)

October 20, 2000

ABSOLUTE MAXIMUM RATINGS

at T

= 25°C

A

Supply Voltage, VCC........................ 26.5 V*

Reverse Supply Voltage, V
Output OFF Voltage, V
Reverse Output Voltage, V
Continuous Output Current, I
Reverse Output Current, I
Package Power Dissipation,

PD.......................................... See Graph

Operating Temperature Range,

TA............................. -40°C to +150°C*

Junction Temperature,

(continuous), TJ.......................... +165°C

(100 hr), TJM............................... +180°C

Storage Temperature, TS................... +170°C

* Operation at increased supply voltages with
external circuitry is described in Applications
Information. Devices for operation at in­creased temperatures are available on special
order.

OUT

............ -24 V

RCC

................. 26.5 V

.......... -24 V

ROUT

....... 20 mA

OUT

.......... 50 mA

ROUT

TRUE ZERO-SPEED, HALL-EFFECT

ADAPTIVE GEAR-TOOTH SENSOR

The ATS660LSB is an ideal gear-tooth sensor solution for uniform
teeth targets as found in today’s demanding transmission applications.
This digital differential Hall-effect sensor is the choice when repeatabil­ity and timing accuracy count. The ATS660LSB incorporates patented
self-calibration circuitry (U.S. Pat. 5,917,320) 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 applica­tions (pitches varying from below 0.5 to over 1.2 teeth per diametric
millimeter). The self-calibration at power up keeps the performance
optimized over the life of the sensor. The ATS660LSB has an open­collector output for direct digital interfacing with no further signal
processing required. This device is available in a small 9-mm diameter
by 7-mm long package for optimal manufacturing.

The integrated circuit incorporates a dual-element Hall-effect
sensor and signal processing that switches in response to differential
magnetic signals created by the ferrous gear teeth. The circuitry
contains a sophisticated digital circuit to eliminate magnet and system
offsets and to achieve true zero-speed operation . D-to-A converters are
used to adjust the device gain at power on and to allow air-gap indepen­dent switching, which greatly reduces vibration sensitivity of the
device.

FEATURES AND BENEFITS

■ Fully optimized differential digital gear-tooth sensor

■ Single-chip sensing IC for high reliability

■ High vibration immunity

■ Precise duty cycle

■ Small mechanical size (9 mm diameter x 7 mm length)

■ Automatic gain control circuitry (self calibration)

■ True zero-speed operation

■ Under-voltage lockout

■ Wide operating temperature range

■ Optimized Hall IC magnetic circuit

■ Digital signal processing

■ Large operating air gap range

■ Wide operating voltage range

■ Excellent repeatability performance

■ Defined power-on state

Always order by complete part number: ATS660LSB .

ATS660LSB

TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR

FUNCTIONAL BLOCK DIAGRAM

MAGNET

Dwg. FH-019-2A

X

E1

X

E2

–

+

REF

–

+

Pin 3 must be externally connected to pin 4.

REG

SUPPLY1

32 V

UVLO

POSITIVE PEAK

DIGITAL PROC.

NEGATIVE PEAK

DIGITAL PROC.

POWER-ON

LOGIC

REFERENCE

GENERATOR

THRESHOLD

COMPARATORS

–

+

–

+

LOGIC

OUTPUT

INTERNAL

3

CONNECTION

CONTROL

CURRENT

LIMIT

<1Ω

OUTPUT

2

GROUND

4

1000

800

100 HO

600

400

200

0

ALLOWABLE PACKAGE POWER DISSIPATION IN mW

40 80 120

CO

60 100 140 18020

AMBIENT TEMPERATURE IN °C

URS M

NTINUO

US

2

AX.

R

θJA

= 147°C/W

160

Dwg. GH-065-6

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 2000 Allegro MicroSystems, Inc.

ATS660LSB

TRUE ZERO-SPEED,

HALL-EFFECT ADAPTIVE

GEAR-TOOTH SENSOR

ELECTRICAL CHARACTERISTICS at VCC = V

= 12 V and TA = +25°C (unless otherwise

OUT

noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V

CC

Power-On State POS VCC = 0 → 5 V HIGH* HIGH* HIGH* –

Under-Voltage Lockout V

Low Output Voltage V

Output Current Limit I

Output LeakageCurrent I

Supply Current I

Output Rise Time I

Output Fall Time I

CC(UV)

OUT(SAT)

OUTM

OFF

CC

r

f

Operating, TJ < 165°C 4.5 12 24 V

VCC = 0 → 5 V 4.1 4.2 4.3 V

I

= 20 mA – 0.2 0.4 V

OUT

25 45 55 mA

V

= 24 V – 0.2 10 µA

OUT

Output off 3.5 7.0 12 mA

Output on 5.0 8.5 14 mA

RL = 500 Ω, CL = 10 pF – 0.2 5.0 µs

RL = 500 Ω, CL = 10 pF – 0.2 5.0 µs

Power-On Time t

Zener Voltage V

on

Z

* Output transistor is OFF (high logic level).

Reference gear, <100 rpm – – 200 µs

IZT = TBD – 32 – V

www.allegromicro.com

3

ATS660LSB

TRUE ZERO-SPEED,
HALL-EFFECT ADAPTIVE
GEAR-TOOTH SENSOR

OPERATION with reference gear at TA = +25°C.

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Air-Gap Range AG Operational 0.5 – 2.5 mm

Calibration Cycle n

Recalibration (Update) n

Minimum Speed v

Maximum Speed v

Duty Cycle Range DC 1000 rpm, 0.5 mm < AG < 2.0 mm – – ±5%

cal

rcal

min

max

Output edges before which 1 1 1 Tooth
calibration is completed

Operating 64 64 64 Teeth

Teeth (cycles) per second – 0 – kHz

Teeth (cycles) per second – 20 – kHz

REFERENCE GEAR DIMENSIONS

Limits

Characteristic Symbol Description Min. Typ. Max. Units

Diameter D

Tooth Width T – 3.0 – mm

Valley Width (pC – T) – 3.0 – mm

O

– 120 – mm

Valley Depth h

Thickness F 3.0 – – mm

4

t

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

–3.0– mm

HALL-EFFECT ADAPTIVE

TYPICAL CHARACTERISTICS

ATS660LSB

TRUE ZERO-SPEED,

GEAR-TOOTH SENSOR

12

10

8.0

6.0

4.0

SUPPLY CURRENT IN mA

2.0

0

0

5

SUPPLY VOLTAGE IN VOLTS

12

10

8.0

6.0

4.0

B > BOP

TA = 150°C

A = +25°C

T

A = -40°C

T

10

15 20 25

30

Dwg. GH-041-4

SUPPLY CURRENT IN mA

2.0

0

0

5

SUPPLY VOLTAGE IN VOLTS

10

15 20 25

B < B

TA = 150°C

A

= +25°C

T

A

= -40°C

T

RP

30

Dwg. GH-041-3

1.2

1.0

0.8

0.6

0.4

SUPPLY CURRENT IN mA

0.2

0

-30

-25

REVERSE SUPPLY VOLTAGE IN VOLTS

-20

TA = 150°C

A = +25°C

T

A = -40°C

T

-15 -10 -5.0

Dwg. GH-031-2

350

300

250

200

150

100

50

B > B

TA = 150°C

A

= +25°C

T

A

= -40°C

T

OP

OUTPUT SATURATION VOLTAGE IN mV

0

0

0

5.0

10 15 20 25

OUTPUT SINK CURRENT IN mA

Dwg. GH-059-1

www.allegromicro.com

5