ALLEGRO ATS651LSH User Manual

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Speed and Direction Sensor with Vibration Immunity

Package SH

ATS651LSH

Two-Wire Self-Calibrating Differential

The ATS651LSH is a mechatronics component with an integrated Hall-effect sensor and magnet, providing an easy-to-use solution for speed and direction sensing applications. The solid thermoset molded plastic package contains a samarium cobalt magnet and a Hall-effect IC optimized to the magnetic circuit. This sensor module has been designed specifically for high reliability in the harsh automotive environment.

The IC employs patented algorithms for the special operational requirements of transmission applications. This two-wire device communicates the speed and direction of a ferrous target via a pulse width modulation (PWM) output protocol. The ATS651LSH is particularly adept at handling vibration without sacrificing maximum air gap capability or creating an erroneous “direction” pulse. Even the higher angular vibration caused by engine cranking is completely rejected by the device. The advanced vibration detection algorithm systematically calibrates the sensor on the true rotation signals from the first three and a half teeth, not on vibration, thus always guaranteeing an accurate signal in running mode.

1. VCC

2. Test pin, Channel 1

3. Test pin, Channel 2

4. GND

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage*, V Reverse-Supply Voltage, V Reverse-Output Voltage, V Temperatures Operating Ambient, T Junction, T Storage, T

*Refer to Power Derating section

.........................................28 V

.......................................165ºC

J(MAX)

................................. –65ºC to 170ºC

........................ –18 V

RCC

....................–50 mA

ROUT

................. –40ºC to 150ºC

Patented running mode algorithms also protect against air gap changes, whether or not the target is in motion. Direction information is always available on the first magnetic edge after a direction change. Advanced signal processing and innovative algorithms make the ATS651LSH an ideal solution for a wide range of speed and direction sensing needs.

The device package is lead (Pb) free, with 100% matte tin plated leadframe.

Features and Benefits

• Rotational direction detection

• Fully optimized digital differential gear-tooth sensor

• Single-chip sensing IC for high reliability

• Small mechanical size (8 mm diameter × 5.5 mm vertical, flat-to-flat)

• Internal current regulator for 2-wire operation

• Automatic Gain Control (AGC) and reference adjust circuit

• 3-bit factory trimmed for tight pulse width accuracy

• True zero-speed operation

• Wide operating voltage range

• Undervoltage lockout

• Defined power-on state

• ESD and reverse polarity protection

Use the following complete part numbers when ordering:

Part Number Packing*

ATS651LSHTN-T 13-in. reel, 800 pieces/reel

*Contact Allegro for additional packing options.

651LSH-DS

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

ATS651LSH

Two-Wire Self-Calibrating Differential Speed and Direction Sensor with Vibration Immunity

V+

VCC

0.01μF C

BYPASS

Hall

Amp

Hall

Amp

Voltage

Regulator

Offset Adjust

Functional Block Diagram

PDAC

AGC

NDAC

PDAC

AGC

NDAC

PThre sh

Reference Generator & Updates

NThresh

PThre sh

Reference Generator & Updates

NThresh

Threshold

Logic

Threshold

Logic

Speed

and

Direction

Logic

Current

Output

Adjust

GND

Typical Application Diagram

CC(HIGH)/ICC(LOW)

ATS651

Note: Pins 2 and 3 may be connected to pin 4.

However, ICC is increased in that configuration.

(Recommended)

0.01 μF C

BYPASS

ECU

100 Ω

SENSE

TEST

SENSE

651LSH-DS

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

ATS651LSH

Two-Wire Self-Calibrating Differential Speed and Direction Sensor with Vibration Immunity

Device Characteristics Tables

ELECTRICAL CHARACTERISTICS Valid for –40°C ≤ TA ≤ 150°C, TJ ≤ 165°C, unless otherwise noted

Characteristics Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V

Undervoltage Lockout V

Reverse Supply Current I

Supply Zener Clamp Voltage V

Supply Zener Resistance R

CC(UV)

RCC

Output Current Slew Rate SR

Power-On State POS ION state – I

Power-On Time

Supply Current

Supply Current Difference ΔI

CC(Low)

CC(High)

CALIBRATION

Direction Information

Speed Information

Direction Change Detection

Signal Variation (At calibration)

Dir

Spd

CAL

DAC CHARACTERISTICS

Dynamic Offset Cancellation

Power-On Time is the time required to complete the internal automatic offset adjust; the DACs are then ready for peak acquisition.

Edge count is based on mechanical edges. First output edge is available on or before N

Edge count is based on mechanical edges. On the NCD edge, direction and speed information is valid.

If the peak-to-peak amplitude of the signal varies more than the specified amount during the direction verification process, then additional edges may

be required for calibration.

The device will compensate for magnetic and installation offsets up to ±60 gauss. Offsets greater than ±60 gauss may cause inaccuracies in the

output.

Running, TJ ≤ 165°C 4.3 – 24 V

VCC = 5 → 0 V – – 4.3 V

VCC = –18 V – – –10 mA

CC(Low)max

+ 3 mA 28 – 40 V

–20–

→ I

(High)

SENSE

, I

(Low)

= 100 Ω, C

→ I

(High)

= 10 pF, 10 to 90% points

SENSE

2 16 – mA/μs

CC(Low)

Gear speed < 100 rpm – – 1 ms

Low-current state 4 7 9 mA

High-current state 12 14.5 17 mA

- I

CC(High)

and low-current state level

difference between high-current state level

CC(Low);

5.3 – – mA

First output transition – – 8 Edge

Running mode direction change – – 1 Edge

Over four edges – – ±0.3 mm

As shipped – ±60 – G

or N

Spd

edges.

Dir

–mA

OPERATING CHARACTERISTICS Using Reference Target 60-0 and valid over operating temperature range

Characteristics Symbol Test Conditions Min. Typ. Max. Units

Operational Air Gap Range

Within specification 0.5 – 2.8 mm

Operating Signal Range Sig Within specification 30 – 1200 G

Operational Air Gap Range is dependent on the available differential magnetic field. The available field is dependent on target geometry and material, and should be independently characterized. The field available from the Reference Target is given in the Reference Target Parameters section of this datasheet.

Continued on the next page...

Allegro MicroSystems, Inc.

651LSH-DS

115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com

ATS651LSH

Two-Wire Self-Calibrating Differential Speed and Direction Sensor with Vibration Immunity

Device Characteristics Tables (Continued)

SWITCHING CHARACTERISTICS Valid for –40°C ≤ TA ≤ 150°C, TJ ≤ 165°C, unless otherwise noted

Characteristics Symbol Test Conditions Min. Typ. Max. Units

Operate Point B

Release Point B

Axial/Radial Runout

(Multiple teeth)

Sudden Air Gap (Single tooth)

Incremental Air Gap

ΔAG

A/R

(Consecutive edges)

ΔAG

Vibration Immunity (At power-on)

Vibration Immunity

(Running)

Maximum Operating Frequency

Inclusive of all Sudden Air Gap and Incremental Air Gap changes during operation.

Device may output one reverse pulse at the start of vibration.

Maximum Operating Frequency may be increased if the customer can resolve Minimum Low-State Duration levels down to the specified value.

ROT

VIBR

% of peak-to-peak referenced from PDAC to NDAC, AG

< AG

OP(max)

% of peak-to-peak referenced from PDAC to NDAC, AG

< AG

OP(max)

–58–%

–42–%

– – ±1.75 mm

Instantaneous air gap change (<500 Hz) – – ±0.4 mm

SAG

Air gap change between edges @ >8 kHz – – ±0.1 mm

IR+

Air gap change between edges @ 8-4 kHz ±0.15 mm

Air gap change between edges @ <4 kHz – – ±0.2 mm

IR-

Rotation allowed due to vibration with temperature change

VIBS

less than 10°C

Rotation allowed due to vibration with temperature change less than 10°C

– – ±0.75 (°)

– – ±0.35 (°)

Rotation Left (target rotation CCW, pin 1 to pin 4), tLD = 38 μs 6 – – kHz

Rotation Right (target rotation CW, pin 4 to pin 1), tLD = 38 μs 12 – – kHz

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651LSH-DS

B+

Differential Magnetic

Flux Density, B

B–

ATS651LSH Switchpoints

ValleyTooth

100 %

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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