Allegro ATS622LSB Datasheet

ATS622LSB

TRUE ZERO-SPEED

HALL-EFFECT GEAR-TOOTH SENSOR

Data Sheet

27627.105

1

2

3

4

Pin 1 = Supply

Pin 2 = Output

Pin 3 = No Connection

Pin 4 = Ground

Dwg. AH-006-6

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
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 s), 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.

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

RCC

OUT

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

ROUT

....... 20 mA

The ATS622LSB is an optimized Hall-effect sensing integrated

circuit and magnet combination that provides a user-friendly solution
for true zero-speed digital gear-tooth sensing. The sensor subassembly
consists of a plastic shell that holds together a samarium-cobalt magnet,
a pole piece, and a Hall-effect sensor that has been optimized to the
magnetic circuit. This small package can be easily assembled and used
in conjunction with a wide variety of gear shapes and sizes.

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 (manufactured under
U.S. Pat. 5,917,320). A-to-D and 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.

This sensor system is ideal for obtaining transmission and crank
information using gear-tooth-based configurations.

FEATURES AND BENEFITS

■ Tight timing accuracy over temperature

■ True zero-speed operation

■ Air-gap independent switch points

■ High vibration immunity

■ Extremely precise duty cycle signal with temperature

■ Large operating air gaps

■ Defined power-on state

■ Wide operating voltage range

■ Digital output representing gear profile

■ Single-chip sensing IC for high reliability

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

■ Optimized magnetic circuit

■ <200 µs power-on time

■ AGC and reference-adjust circuit

■ Under-voltage lockout

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

Always order by complete part number: ATS622LSB .

ATS622LSB

TRUE ZERO-SPEED,
GEAR-TOOTH SENSOR

FUNCTIONAL BLOCK DIAGRAM

MAGNET

Dwg. FH-019-3

1000

SUPPLY1

3

NO (INTERNAL)

CONNECTION

32 V

REG

X

E1

X

E2

–

+

–

REF

+

POSITIVE PEAK

DIGITAL PROC.

NEGATIVE PEAK

DIGITAL PROC.

UVLO

POWER-ON

LOGIC

REFERENCE

GENERATOR

THRESHOLD

COMPARATORS

–

+

–

+

LOGIC

OUTPUT

OUTPUT

2

GROUND

4

800

1

0

0

H

O

600

400

200

0

ALLOWABLE PACKAGE POWER DISSIPATION IN mW

40 80 120

C

60 100 140 18020

AMBIENT TEMPERATURE IN °C

U

R

O

N

S

T

M

IN

U

O

U

S

2

R

θJA

= 147°C/W

A

X

.

160

Dwg. GH-065-6

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

ATS622LSB

TRUE ZERO-SPEED,

GEAR-TOOTH SENSOR

ELECTRICAL CHARACTERISTICS at TA = +25°C (unless otherwise noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V

CC

Operating, TJ < 165°C 4.5 12 24 V

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

Under-Voltage Lockout V

Low Output Voltage V

OUT(SAT)

Output Current Limit I

Output Leakage Current I

Supply Current I

CC(UV)

OUTM

OFF

CC

VCC = 0 → 5 V 4.1 4.2 4.3 V

I

= 20 mA – 0.2 0.4 V

OUT

V

= 12 V 254555 mA

OUT

V

= 24 V – 0.2 10 µA

OUT

Output off 3.5 7.0 12 mA

Output on 5.0 8.5 14 mA

Output Rise Time t

Output Fall Time t

Power-On Time t

Zener Voltage V

r

f

on

Z

RL = 500 Ω, CL = 10 pF – 0.2 5.0 µs

RL = 500 Ω, CL = 10 pF – 0.2 5.0 µs

Reference gear, <100 rpm – – 200 µs

IZT = TBD – 32 – V

www.allegromicro.com

3

ATS622LSB

TRUE ZERO-SPEED,
GEAR-TOOTH SENSOR

OPERATION over operating voltage and temperature range with reference target (unless oth­erwise noted)

Limits

Characteristic Symbol Description Min. Typ. Max. Units

Air Gap Range AG Operating, target speed > 20 RPM 0.5 – 2.5 mm

Calibration Cycle n

cal

Output edges before which 1 1 1 Edge

calibration is completed*

Calibration Update n

r

Output falling edges for startup 128 128 128 Edges

calibration to be complete

Minimum Speed n

Maximum Speed n

Timing Accuracy t

min

max

θ

60 teeth per second = 1 r/s – 133 – r/s

Target speed = 1000 rpm, – ±0.2 ±0.5 °

–0– r/s

0.5 mm < AG < 2.5 mm

* Non-uniform magnetic profiles may require additional output pulses before calibration is completed.

REFERENCE GEAR DIMENSIONS (60-0)

Limits

Characteristic Symbol Description Min. Typ. Max. Units

Diameter D

O

Tooth Width T – 3.0 – mm

– 120 – mm

Valley Width (pC – T) – 3.0 – mm

Valley Depth h

t

–3.0– mm

Thickness F 3.0 – – mm

4

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