ALLEGRO ATS612LSB User Manual

Dwg. AH-006

1

2

3

4

Pin 1 = Supply
P
P

or

P

查询ATS612LSB供应商

in 2 = Output
in 3 = Capacit
in 4 = Ground

27627.110a

ATS612LSB

DYNAMIC, SELF-CALIBRATING,

PEAK-DETECTING, DIFFERENTIAL

HALL-EFFECT GEAR-TOOTH SENSOR

The ATS612LSB gear-tooth sensor is a peak detecting device that
uses automatic gain control to provide extremely accurate gear edge
detection down to low operating speeds. Each sensor module consists
of a high-temperature plastic shell that holds together a samarium­cobalt magnet, a pole piece, and a differential open-collector Hall IC
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 gear-sensing technology used for this sensor is Hall-effect
based. The sensor incorporates a dual-element Hall IC that switches in
response to differential magnetic signals created by ferrous targets.
The sophisticated processing circuitry contains a 5-bit A/D converter
that self-calibrates (normalizes) the internal gain of the device to
minimize the effect of air-gap variations. The patented peak-detecting
filter circuit eliminates magnet and system offsets and has the ability to
discriminate relatively fast changes such as those caused by tilt, gear
wobble, and eccentricities yet provides stable operation to extremely
low RPM.

Data Sheet

ABSOLUTE MAXIMUM RATINGS

over operating temperature range

Supply Voltage, VCC...............................24 V*

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

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

Operating Temperature Range,

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

T

A

Storage Temperature, T

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

† Output is current limited at 25 mA to 55 mA.
Continued operation in this mode can cause
excessive device heating and failure. See graph,
next page.

OUT

.............. -16 V

RCC

....................... 24 V

...... 25 mA†

OUT

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

ROUT

.................. +170°C

S

These sensor systems are ideal for use in gathering speed, posi­tion, and timing information using gear-tooth-based configurations. The
ATS612LSB is particularly suited to those applications that require
extremely accurate duty cycle control or accurate edge detection such
as in automotive crank shaft applications. The lower vibration sensitiv­ity also makes this device extremely useful for transmission speed
sensing.

ATS612LSB: Large/small-tooth gear-position sensing —
crank angle, transmission speed, cam angle.

continued next page…

Always order by complete part number: ATS612LSB .

ATS612LSB

UVLO

SUPPLY

REG

+

–

1

E2

MAGNET

E1

X

X

OUTPUT

Dwg. FH-014-1

GROUND

2

4

CAPACITOR

3

POWER-ON

+

–

TRACK &

GAIN

CURRENT

600

400

200

4080120

1600AMBIENT TEMPERATURE IN

C

Dwg. GH-065-7

60

100

140

180

20

800

1000

R

= 150°C/W

DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR

FEATURES AND BENEFITS

■ Fully Optimized Differential Digital Gear-Tooth Sensor

■ Single-Chip Sensing IC for High Reliability

■ Digital Output Representing Target Profile

■ Extremely Low Timing Accuracy Drift with Temperature

■ Large Operating Air Gaps

■ Small Mechanical Size

■ Optimized Magnetic Circuit

■ Patented Peak-Detecting Filter:

80 µs Typical Power-On Time
<10 RPM Operation (single-tooth target)
Correct First-Edge Detection
Uses Small Value Ceramic Capacitors

■ Under-Voltage Lockout

■ Wide Operating Voltage Range

■ Defined Power-On State

ALLOWABLE PACKAGE POWER DISSIPATION IN mW

θJA

°°

°°

FUNCTIONAL BLOCK DIAGRAM

LOGIC

REFERENCE

GENERATOR

HOLD

LIMIT

2

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 2001, 2002 Allegro MicroSystems, Inc.

ATS612LSB

DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,

DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR

ELECTRICAL CHARACTERISTICS over operating voltage and temperature range,
C

= 0.1 µF to 0.47 µF.

3

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V

CC

Operating, TJ < 165°C 3.6 – 24 V
Power-On State POS VCC = 0 → 5 V HIGH HIGH HIGH –
Under-Voltage Lockout V
Under-Voltage Hysteresis V
Low Output Voltage V

OUT(SAT)

Output Current Limit I
Output Leakage Current I
Supply Current I

CC(UV)

CC(hys)

OUTM

OFF

CC

VCC = 0 → 5 V 2.5 – 3.6 V

V

– V

CC(UV)

I

= 20 mA – 190 400 mV

OUT

V

OUT

V

OUT

CC(SD)

= 12 V 25 45 55 mA
= 24 V – 0.2 15 µA

– 0.2 – V

Output OFF 6.0 8.2 13 mA

Output ON 8.0 10 15 mA
Power-On Delay t
Output Rise Time t

Output Fall Time t

on

r

f

NOTES: Typical data is at VCC = 8 V and T

V

= shutdown voltage, V

CC(SD)

VCC > 5 V – 80 500 µs

RL = 500 Ω, CL = 10 pF – 0.2 5.0 µs

RL = 500 Ω, CL = 10 pF – 0.2 5.0 µs

= +25°C and is for design information only.

A

= 5 V → 0.

CC

www.allegromicro.com

3

ATS612LSB

Dwg. MH-016-2 mm

AIR GAP

D = 120 mm

o

TARGET

F (THICKNESS) ≥ 3 mm

E1E2SENSOR

SOUTH

NORTH

PERMANENT

POLE PIECE

1 2 3 4

SIGNATURE

DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,
DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR

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

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Air Gap Range AG Operating, 0.4 – 2.5 mm

Target Speed > 20 RPM

Calibration Cycle n

cal

Output edges before which 1 1 1 Edge
calibration is completed*

Calibration Mode n

dis

Output falling edges for startup 64 64 64 Edges

Disable calibration to be complete
Timing Accuracy t

θ

Target Speed = 1000 RPM, – ±0.5 ±0.75 °

0.4 mm ≤ AG ≤ 2 mm

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

REFERENCE TARGET

t

h = 5 mm

4

T = 3 mm

MAGNET

3 mm

TOOTH (1)

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

ATS612LSB

04080

120

160

250

150

AMBIENT TEMPERATURE IN

C

225

200

175

-40

Dwg. GH-013-2

200

275

I = 20 mA

OUT

04080

120

160

12

AMBIENT TEMPERATURE IN

C

10

8.0

6.0

-40

Dwg. GH-014-2

200119.0

7.0144.0

OUTPUT ON

OUTPUT OFF

V = 8 V

CC

12

SUPPLY VOLTAGE IN VOLTS

10

8.0

6.0

Dwg. GH-058-1

11

9.0

7.0

13

5.0

OUTPUT ON

OUTPUT OFF

2.0

6.01014

18

T = 25°C

A

DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,

DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR

TYPICAL ELECTRICAL CHARACTERISTICS

SUPPLY CURRENT IN mA

SUPPLY CURRENT IN mA

°°

°°

www.allegromicro.com

OUTPUT SATURATION VOLTAGE IN mV

°°

°°

5