ALLEGRO ATS672LSB User Manual

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Preliminary – Subject to Change

PIN OUT DIAGRAM

4 3 2 1

Pin 1: V Pin 2: V Pin 3: Test Pin (Tie to GND) Pin 4: Gnd

OUT

ATS672LSB

Self-Calibrating TPO Gear-Tooth Sensor with

The ATS672LSB true zero-speed gear-tooth sensors are optimized Hall IC/magnet configurations packaged in a single inline package (SIP) that provides a user-friendly solution for digital gear-tooth-sensing applications. The SIP 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 single-element Hall IC that switches in response to magnetic signals created by a ferrous target. The IC contains a sophisticated digital circuit designed to eliminate the detrimental effects of magnet and system offsets. Signal processing is used to provide zero-speed performance independent of air gap and also to dynamically adapt device performance to the typical operating conditions found in automotive applications (reduced vibration sensitivity). Highresolution (9-bit) 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 (such as magnetic overshoot).

9-Bit Signal Capture

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V Reverse Supply Voltage, V Reverse Current Through Output, I Continuous Output Current, I Storage Temperature, T Package Power Rating, R Maximum Junction Temperature, T Maximum Junction Temperature – 100 Hours, T

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

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

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

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

OUT

. . . . . . . . . . . . . . . . . . . . . . . . . . . 170° C

. . . . . . . . . . . . . . . . . . . ~150°C/W

θJA

. . . . . . . . . . . . . . . . . . . . . . . . . 170° C

Jmax

. . . . . . . . . . . . . . . . . . . . . . . . . 180° C

Jmax

The ATS672LSB also includes a low-bandwidth filter that increases the noise immunity and the signal-to-noise ratio of the sensor. These features result in potential improvements in both the timing accuracy and the jitter performance of the device. The ATS672LSB sensor system is optimized for cam applications. Four versions of this device are available. The sensor can be chosen to have a high or low output signal in response to a “tooth”. The sensor is also available with and without TPOS (true power on state) capability. The low-on-tooth sensor without TPOS is available through general sales. (Part # ATS672LSB-LN). For other versions please contact the factory. Some restrictions may apply.

FEATURES

 Tight timing accuracy over temperature  True zero-speed operation  True power-on sensing  Air gap independent switch points  High vibration immunity  Large operating air gaps  Operation down to 3.3 V  Digital output representing target profile  Single-chip solution for high reliability  Small mechanical size  Optimized Hall IC magnetic system  AGC and reference-adjust circuit

 Undervoltage lockout

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

OPERATING CHARACTERISTICS Valid at T

otherwise noted

Characteristics Symbol Test Conditions

ELECTRICAL CHARACTERISTICS

Supply Voltage VCC Operating; TJ < TJmax 3.3 26.5 V

= -40°C to +150°C and power supply within specification unless

Limits

Min. Typ. Max. Units

Reverse Supply Voltage V

RCC

= -5 mA (max) -18 V

RCC

Supply Zener Clamp Voltage VZ 28 33 37 V

Supply Zener Current IZ Tj < Tjmax; pulsed 100 mA

Output = off 3.0 6.5 11 mA

Supply Current ICC

Output = on 3.0 6.5 11 mA

POWER-ON STATE CHARACTERISTICS

Power Up Time t

Under Voltage Lockout V

Gear Speed < 100 rpm; Vcc> 3.3 V - 500 µs

- <Vcc

Min

OUTPUT STAGE

Low Output Voltage V

Output Current Limit I

Output Leakage Current I

Output Rise Time t

Output Fall Time t

OUT

lin

OFF

OUT

Output = ON, Tj < Tjmax 25 45 70 mA

Output = off, V

RL = 500 Ω, CL = 10 pF, TA = 25°C

= 15 mA, Output = on - 0.2 0.45 V

OUT

= Vcc

- 10

(Max)

- 0.9 5.0

- 0.5 5.0

µA

µs

Rise and Fall Time

Output High

90%

100%

10%

Rev. 1.2 May 1, 2002

Page 2 of 12

90%

10%

Output Low

Time

[Seconds]

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

Limits

Characteristics Symbol Test Conditions

Min. Typ. Max. Units

SWITCH POINT CHARACTERISTICS

Tooth Speed S

Bandwidth f-3db 40 kHz

Operate Point Bop%

Release Point Brp%

Output Polarity ATS672LSB-LN (no TPOS) ATS672LSB-LT (with TPOS)*

Output Polarity ATS672LSB-HN (no TPOS)* ATS672LSB-HT (with TPOS)*

* Restrictions on availability may apply.

Calibration

Initial Calibration CI

AGC Disable Cf

max

OUT

0 8.0 kHz

% of peak to peak referenced to tooth signal, AG < Agmax; % of peak to peak referenced to tooth signal, AG < Agmax;

Over valley HIGH

Over tooth LOW

Over valley LOW

Over tooth HIGH

Number of rising mechanical edges for

accurate edge detection

Number of rising mechanical edges

required to complete AGC calibration

+30 %

+40 %

3 Edges

Switchpoints

Tooth Signal

Bop%

100%

Brp%

Bop%

Brp%

Valley Signal

Rev. 1.2 May 1, 2002

Page 3 of 12

ATS672LSB

SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE

Preliminary – Subject to Change

OPERATION WITH 8X Reference Target over Operational Air Gap and Temperature with Test Circuit #1 Unless Otherwise Stated

Characteristics Symbol Test Conditions

Limits

Min. Typ. Max. Units

ICRel

Rising and falling edge, RPM = 1000 during initial calibration

3.0 6.0 °

gear eccentricity < 0.1 mm

Relative Timing Accuracy

Rel

Rising mechanical edge after initial calibration, RPM = 1000

- 0.3 0.6 ° gear eccentricity < 0.1 mm Falling mechanical edge

Rel

after initial calibration, RPM = 1000

- 0.5 0.8 ° gear eccentricity < 0.1 mm Rising mechanical edge

Absolute Timing Accuracy

AbsRise

air gap: 1.5mm, temperature: 25°C RPM: 1000 Falling mechanical edge

AbsFall

air gap: 1.5mm, temperature: 25°C

- -0.2 - °

- +0.6 - ° RPM: 1000

Phase Delay t

TPOS Air Gap Min

ATS672LSB – LT and HT

TPOS Air Gap Range

ATS672LSB – LT and HT

TPOS Air Gap Max

ATS672LSB – LT and HT

RelSpeed

TPOS

After initial calibration air gap: 1.5 mm, temperature: 25°C

Valleys may be detected as teeth:

Min

incorrect TPOS

- 6.66 -

- - 0.5 mm

Distance for correct TPOS functionality 0.5 - 2.25 mm

Teeth may be detected as a valley:

Max

incorrect TPOS

2.25 - 5.0 mm

Operational Air Gap Range AG Output switching: running mode only 0.5 - 2.25 mm

x 10

/ RPM

-5

Edge Repeatability

θE

360° repeatability, 1000 edges 0.04

Relative Timing Accuracy Range is the change in edge position over the operational air gap and temperature range that

can be expected from a single device. This does not include part-to-part variation.

The Typical Absolute Timing Accuracy is the difference between the target mechanical edge (rising or falling) and the

corresponding sensor electrical edge.

Phase Delay is the change in edge position over the operational RPM range that can be expected from a single device.

This does not include part-to-part variation or variation due to temperature.

The TPOS Air Gap Min is the Installation Air Gap where the device may detect Valleys as Teeth. The True Power On

Function is NOT guaranteed to operate.

The TPOS Air Gap Range is the Installation Air Gap Range where the True Power On Function is guaranteed to

operate. Operating is defined as correctly detecting a tooth when powered up over a tooth and correctly detecting a valley when powered up over a valley using the Reference Target. This specification is only valid for targets that meet or exceed the ‘Gear Parameters for Correct TPOS Operation’ section of this document.

The TPOS Air Gap Max is the Installation Air Gap where the device may detect a Tooth as a Valley. The True Power On

Function is NOT guaranteed to operate.

Rev. 1.2 May 1, 2002

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