ALLEGRO ATS665LSG User Manual

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ATS665LSG

Pin 1: V Pin 2: V Pin 3: Tie to Gnd or Float Pin 4: Gnd

OUT

ABSOLUTE MAXIMUM RATINGS

Supply Voltage1,

VCC . . . . . . . . . . . . . . . . . . . . . . . . . . 26.5 V

Reverse Supply Voltage, V Reverse Output Current I Continuous Output Current, I Ambient Operating Temperature Range, T Storage Temperature, T Maximum Junction Temperature, T Maximum Junction Temperature – 100 Hours, T

Refer to power de-rating curve

. . . . . . . . . . . . . . . . . . . . . . . . . . –18 V

RCC

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

RCC

. . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

OUT

. . . . . . . . . . . . . . . . . . -40° C to 150°C

. . . . . . . . . . . . . . . . . . . . -65° C to 170°C

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

Jmax

. . . . . . . . . . . . . . . . . . . . . . . . . 185° C

Jmax

≥ -0.5V

OUT

True Zero Speed,

High Accuracy, Gear Tooth Sensor

The ATS665 true zero-speed gear tooth sensor is an optimized Hall IC/magnet configuration packaged in a molded module that provides a user-friendly solution for digital gear tooth sensing applications. The sensor module consists of an over-molded package, which holds together a samarium cobalt magnet, a pole piece and a true zero-speed Hall IC that has been optimized to the magnetic circuit. This small package can be easily assembled and used in conjunction with gears of various shapes and sizes.

The sensor incorporates a dual element Hall IC that switches in response to differential magnetic signals created by a ferrous target. The IC contains a sophisticated compensating circuit designed to reduce the detrimental effects of magnet and system offsets. Digital processing of the analog signal provides zero speed performance independent of air gap and also dynamic adaptation of device performance to the typical operating conditions found in automotive applications (reduced vibration sensitivity). Highresolution peak detecting DACs are used to set the adaptive switching thresholds of the device. Hysteresis in the thresholds reduces the negative effects of any anomalies in the magnetic signal associated with the targets used in many automotive applications.

This sensor’s ability to provide tight duty cycle at high speeds and over a wide temperature range makes it ideal for transmission and industrial speed applications. The ATS665 is available in the SG package in the automotive temperature range, -40° to 150° (L).

FEATURES & BENEFITS

 True zero-speed operation  Switchpoints independent of air gap  High vibration immunity  Precise duty cycle signal over operating temperature range  Large operating air gaps  Defined power-on state  Wide operating voltage range  Digital output representing target profile  Single-chip sensing IC for high reliability  Small mechanical size  Optimized Hall IC magnetic system  200 µs power-on time at gear speed < 100 rpm  AGC and reference adjust circuit  Under-voltage lockout

Use complete part number when ordering: ATS665LSG.

ATS665LSG

TRUE ZERO-SPEED GEAR TOOTH SENSOR

OPERATING CHARACTERISTICS

Valid at TA = -40oC to 150oC over air gap, unless otherwise noted

Typical operating parameters: V

Characteristics Symbol Test Conditions

ELECTRICAL CHARACTERISTICS

Supply Voltage VCC Operating; Tj < Tjmax 3.3 – 24 V

Under Voltage Lockout V

Reverse Supply Current I

Supply Zener Clamp Voltage VZ Icc = I

Supply Zener Current IZ Test only; VCC = 28V, Tj < Tj(max) – –

Supply Current ICC

– –

CC(UV)

VCC = –18 V – – –10 mA

RCC

+ 3mA,TA = 25°C 26.5 – – V

cconMAX

Output OFF – 8 14 mA

Output ON – 8 14 mA

= 12 V and TA = 25°C

Limits

Min. Typ. Max. Units

< Vcc

min

Iccon

+ 3

max

POWER-ON STATE CHARACTERISTICS

Power-On State SPO – High –

Power-On Time t

Gear Speed < 100 RPM; VCC > VCC min – – 200

µs

OUTPUT STAGE

Low Output Voltage V

Output Current Limit I

Output Leakage Current I

Output Rise Time t

Output Fall Time t

Output = ON, I

Sat

lim

OFF

= 12 V, Tj < Tj(max) 25 45 70 mA

OUT

Output = OFF, V

= 500 Ω, C

LOAD

= 500 Ω, C

LOAD

= 20 mA – 225 400 mV

SINK

= 24 V – – 10

OUT

LOAD

= 10 pF

– 1.0 2

– 0.6 2

µA

µs

SWITCH POINT CHARACTERISTICS

Target Speed S

Reference target 0 – 12000 rpm

Bandwidth f-3dB – 20 – kHz

Operate Point BOP % of peak-to-peak signal, AG < AG

Release Point BRP % of peak-to-peak signal, AG < AG

– 70 – %

(max)

– 30 – %

(max)

Final Version, Rev 1.0; DSD; 01Aug03

Page 2

CALIBRATION

ATS665LSG

TRUE ZERO-SPEED GEAR TOOTH SENSOR

Initial Calibration

Calibration Update

Start-up3 – 2 6 Edges

Running mode operation Continuous

OPERATING CHARACTERISTICS (with 60-0 reference target)

Operational Air Gap AG

Duty Cycle

Operating Signal

Measured from sensor face to top of target tooth

AG < AG

Duty cycle spec compliance 60 – – G

, reference target 42 47 52 %

(max)

REFERENCE TARGET/GEAR INFORMATION

Power-on speed ≤ 200 rpm

Diameter 120 mm

Thickness 6 mm

Tooth Width 3 mm

0.5 – 2.5 mm

Valley Width 3 mm

Valley Depth 3 mm

Material Low carbon steel

Final Version, Rev 1.0; DSD; 01Aug03

Page 3

ATS665LSG

TRUE ZERO-SPEED GEAR TOOTH SENSOR

SENSOR DESCRIPTION

Assembly Description:

The ATS665 true zero speed gear tooth sensor is a Hall IC/magnet configuration that is fully optimized to provide digital detection of gear tooth edges. This sensor is integrally molded into a plastic body that has been optimized for size, ease of assembly, and manufacturability. High operating temperature materials are used in all aspects of construction.

Sensing Technology: The gear tooth sensor sub-assembly contains a single-chip differential Hall effect sensor IC, a Samarium Cobalt magnet, and a flat ferrous pole piece. The Hall IC consists of two Hall elements spaced 2.2 mm apart which measure the magnetic gradient created by the passing of a ferrous object. The gradient is converted to an analog voltage that is then processed to provide a digital output signal.

Final Version, Rev 1.0; DSD; 01Aug03

Page 4

ATS665LSG

TRUE ZERO-SPEED GEAR TOOTH SENSOR

Operation:

After proper power is applied to the component the sensor is then capable of providing digital information that is representative of the profile of a rotating gear. No additional optimization is needed and minimal processing circuitry is required. This ease of use should reduce design time and incremental assembly costs for most applications. The following output diagram is indicative of the sensor performance for the polarity indicated in the figure at the bottom of the page.

MECHANICAL PROFILE

MAGNETIC PROFILE

SENSOR ELECTRICAL OUTPUT PROFILE

Output Polarity:

The output of the sensor will switch from LOW to HIGH as the leading edge of the tooth passes the sensor face in the direction indicated in the figure below. In this system configuration, the output voltage will be high when the sensor is facing a tooth. If rotation occurs in the opposite direction, the output polarity will invert.

High over Tooth

Power-On State Operation: The device is guaranteed to power up in the OFF state (logic high output).

Final Version, Rev 1.0; DSD; 01Aug03

Page 5

ATS665LSG

TRUE ZERO-SPEED GEAR TOOTH SENSOR

Start-up Detection:

Since the sensor powers up in the OFF state (logic high output), the first edge seen by the sensor can be missed if the switching induced by that edge reinforces the OFF state. Therefore, the first edge that can be guaranteed to induce an output transition is the second detected edge. This device has accurate first electrical falling edge detection. The tables below show various start-up schemes.

MECHANICAL

TARGET PROFILE

MAGNETIC PROFILE

(High over Tooth)

SENSOR OUTPUT

(Start-up over Valley)

High over Tooth 

SENSOR OUTPUT

(Start-up over Rising Edge)

Low over Tooth 

SENSOR OUTPUT

(Start-up over Tooth)

SENSOR OUTPUT

(Start-up over Falling Edge)

MECHANICAL

TARGET PROFILE

MAGNETIC PROFILE

(Low over Tooth)

SENSOR OUTPUT

(Start-up over Valley)

SENSOR OUTPUT

(Start-up over Rising Edge)

Sensor start-up location

Final Version, Rev 1.0; DSD; 01Aug03

Page 6

SENSOR OUTPUT

(Start-up over Tooth)

SENSOR OUTPUT

(Start-up over Falling Edge)

Sensor start-up location

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