ALLEGRO ATS612LSG User Manual

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Pin 1: Supply Pin 2: Output Pin 3: Capacitor Pin 4: Ground

ATS612LSG

DYNAMIC, SELF-CALIBRATING,

The ATS612LSG 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 an over-molded package, which holds together a samarium-cobalt magnet, a pole piece and a differential opencollector 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 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 D/A 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 other eccentricities, yet provides stable operation to extremely low RPM.

This sensor system is ideal for use in gathering speed, position, and timing information using gear-tooth-based configurations. The ATS612 is particularly suited to those applications that require extremely accurate duty cycle control or accurate edge detection such as in automotive crankshaft applications. The lower vibration sensitivity also makes this device extremely useful for transmission speed sensing.

PEAK-DETECTING, DIFFERENTIAL

HALL-EFFECT GEAR-TOOTH SENSOR

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V Reverse Supply Voltage, V Output OFF Voltage, V Continuous Output Current, I Reverse Output Current, I Package Power Dissipation, P Operating Temperature Range,

T

.............................. –40°°°°C to +150°°°°C

A

Storage Temperature, T Maximum Junction Temperature, T

.................................................. 165°°°° C

J

..............................…. 24 V

CC

OUT

................. –16 V

RCC

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

............ 25 mA

OUT

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

ROUT

...... See Graph

D

...................... +170°°°°C

S

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) Uses Small Value Ceramic Capacitors

 Under-Voltage Lockout  Wide Operating Voltage Range  Defined Power-On State

ATS612LSG

DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,

DIFFERENTIAL HALL-EFFECT GEAR TOOTH SENSOR

Timing Diagrams

MECHANICAL PROFILE

SIG TOOTH

MAGNETIC PROFILE

SENSOR ELECTRICAL OUTPUT PROFILE

NOTE: Output polarity is dependent upon sensor orientation and target rotation. See Output Polarity

description on page 9.

115 Northeast Cutoff, Box 15036

Page 2 of 15

Worcester, Massachusetts 01615-0036 (508) 853-5000

ATS612LSG

DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,

DIFFERENTIAL HALL-EFFECT GEAR TOOTH SENSOR

ELECTRICAL CHARACTERISTICS over operating voltage and temperature range, C3 = 0.1 µF to 0.47 µF.

Limits

Characteristic Symbol Test Condition

Supply Voltage VCC

Power-On State POS

Under-Voltage Lockout V

Under-Voltage Hysteresis V

Low Output Voltage V

Supply Zener Clamp Voltage

Output Current Limit I

Output Leakage Current I

CC(UV)

CC(hys)

OUT(SAT)

VZ

OUTM

OFF

Operating, T

V

CC

V

CC(UV)

V

– V

I

CC

CC(SD)

OUT

ICC = 18 mA 24 — —

V

OUT

V

OUT

< 165°C

J

= 0 → 5 V = 0 → 5 V

(see NOTE below) — 0.2 — V

= 20 mA — 185 400 mV

= 12 V 25 45 55 mA

= 24 V — 0.2 15 µA

Min. Typ. Max. Units

3.6 — 24 V

HIGH HIGH HIGH —

2.5 — 3.6 V

Output OFF 6.0 8.7 13 mA

Supply Current ICC

Output ON 8.0 10.7 15 mA

Power-On Delay t

on

Output Rise Time tr

Output Fall Time tf

R

VCC > 5 V — 80 500 µs

= 500 Ω, C

L

= 500 Ω, C

L

= 10 pF

L

= 10 pF

L

— 0.2 5.0 µs

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

= shutdown voltage, V

CC(SD)

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

A

= 5 V → 0.

CC

V

115 Northeast Cutoff, Box 15036

Page 3 of 15

Worcester, Massachusetts 01615-0036 (508) 853-5000

ATS612LSG

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 Condition

Air Gap Range AG

Calibration Cycle n

Calibration Mode Disable n

Relative Timing Accuracy, Sequential

Allowable User Induced Differential Offset

cal

dis

t

θ

Operating within specification,

Target Speed > 20 RPM

Output edges before which

Calibration is completed*

Output falling edges for startup

calibration to be complete

Target Speed = 1000 RPM,

0.4 mm ≤ AG ≤ 2 mm

Output switching only; may not meet data sheet specifications

Min. Typ. Max. Units

0.4 — 2.25 mm

1 1 1 Edge

64 64 64 Edges

— ±0.3 ±0.9

— — ±50 G

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

°

115 Northeast Cutoff, Box 15036

Page 4 of 15

Worcester, Massachusetts 01615-0036 (508) 853-5000

DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,

DIFFERENTIAL HALL-EFFECT GEAR TOOTH SENSOR

REFERENCE TARGET / GEAR INFORMATION

Diameter 120 mm

Thickness 6 mm

Sequential Tooth Width 3 mm

Sequential Valley Width 3 mm

Sequential Valley Depth 3 mm

Signature Tooth Width 9 mm

Material Low carbon steel

ATS612LSG

115 Northeast Cutoff, Box 15036

Page 5 of 15

Worcester, Massachusetts 01615-0036 (508) 853-5000