ATS672LSB.pdf

ATS672LSB

Preliminary – Subject to Change

PIN OUT DIAGRAM

Self-Calibrating TPO Gear-Tooth Sensor with

9-Bit Signal Capture

4 3 2 1

The ATS672LSB true zero-speed gear-tooth sensors are

optimized Hall IC/magnet configurations packaged in a single in-

line 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.

Pin 1: V CC

Pin 2: V OUT

Pin 3: Test Pin (Tie to GND)

Pin 4: Gnd

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). High-

resolution (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).

ABSOLUTE MAXIMUM RATINGS

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.

Supply Voltage,

CC . . . . . . . . . . . . . . . . . . . . . . . . . . 28 V

Reverse Supply Voltage,

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

Reverse Current Through Output,

I R . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA

Continuous Output Current,

I OUT . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

Storage Temperature,

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

Package Power Rating,

θ JA . . . . . . . . . . . . . . . . . . . ~150 ° C/W

Maximum Junction Temperature,

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

Maximum Junction Temperature – 100 Hours,

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

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

otherwise noted

Limits

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max. Units

ELECTRICAL CHARACTERISTICS

Supply Voltage

V CC

Operating; T J < T J max

3.3

26.5

Reverse Supply Voltage

V RCC

I RCC = -5 mA (max)

-18

Supply Zener Clamp Voltage

V Z

Supply Zener Current

I Z

Tj < Tjmax; pulsed

100

Supply Current

I CC

Output = off

3.0

6.5

Output = on

3.0

6.5

POWER-ON STATE CHARACTERISTICS

Power Up Time

t PO

Gear Speed < 100 rpm; Vcc> 3.3 V

500

µs

Under Voltage Lockout

V UV

<Vcc Min

OUTPUT STAGE

Low Output Voltage

V OUT

I OUT = 15 mA, Output = on

0.2

0.45

Output Current Limit

I lin

Output = ON, Tj < Tjmax

Output Leakage Current

I OFF

Output = off, V OUT = Vcc (Max)

10 µ A

Output Rise Time

t r

R L = 500 Ω , C L = 10 pF, T A = 25°C

0.9

5.0 µ s

Output Fall Time

t f

R L = 500 Ω , C L = 10 pF, T A = 25°C

0.5

5.0 µ s

Rise and Fall Time

Output High

90%

100%

10%

t r

t f

Output Low

Time

[Seconds]

Rev. 1.2 May 1, 2002

Page 2 of 12

115 Northeast Cutoff, Box 15036

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

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 max

8.0

kHz

Bandwidth

f-3db

kHz

Operate Point

Bop%

% of peak to peak referenced to tooth

signal, AG < Agmax;

+30

Release Point

Brp%

% of peak to peak referenced to tooth

signal, AG < Agmax;

+40

Output Polarity

ATS672LSB-LN (no TPOS)

ATS672LSB-LT (with TPOS)*

Over valley

HIGH

V OUT

Over tooth

LOW

Output Polarity

ATS672LSB-HN (no TPOS)*

ATS672LSB-HT (with TPOS)*

Over valley

LOW

V OUT

Over tooth

HIGH

* Restrictions on availability may apply.

Calibration

Initial Calibration

C I

Number of rising mechanical edges for

accurate edge detection

Edges

AGC Disable

C f

Number of rising mechanical edges

required to complete AGC calibration

Edges

Switchpoints

Tooth Signal

Bop%

Brp%

Bop%

100%

Brp%

Valley Signal

Rev. 1.2 May 1, 2002

Page 3 of 12

115 Northeast Cutoff, Box 15036

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

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

Limits

Characteristics

Symbol

Test Conditions

Min.

Typ. Max. Units

t ICRel

Rising and falling edge, RPM = 1000

during initial calibration

gear eccentricity < 0.1 mm

3.0

6.0

1 Relative Timing Accuracy

t Rel

Rising mechanical edge

after initial calibration, RPM = 1000

gear eccentricity < 0.1 mm

0.3

0.6

t Rel

Falling mechanical edge

after initial calibration, RPM = 1000

gear eccentricity < 0.1 mm

0.5

0.8

t AbsRise

Rising mechanical edge

air gap: 1.5mm, temperature: 25°C

RPM: 1000

-0.2

2 Absolute Timing Accuracy

Falling mechanical edge

air gap: 1.5mm, temperature: 25°C

RPM: 1000

t AbsFall

+0.6

3 Phase Delay

t RelSpeed

After initial calibration

air gap: 1.5 mm, temperature: 25°C

6.66

x 10 -5 °

/ RPM

4 TPOS Air Gap Min

ATS672LSB – LT and HT

AG Min

Valleys may be detected as teeth:

incorrect TPOS

0.5

5 TPOS Air Gap Range

ATS672LSB – LT and HT

AG TPOS Distance for correct TPOS functionality

0.5

2.25

6 TPOS Air Gap Max

ATS672LSB – LT and HT

AG Max

Teeth may be detected as a valley:

incorrect TPOS

2.25

5.0

Operational Air Gap Range

Output switching: running mode only

0.5

2.25

Edge Repeatability

t θ E

360° repeatability, 1000 edges

0.04

1 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.

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

corresponding sensor electrical edge.

3 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.

4 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.

5 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.

6 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

Page 4 of 12

115 Northeast Cutoff, Box 15036

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

ATS672LSB

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

Preliminary – Subject to Change

Relative Timing Accuracy

Absolute Timing Accuracy

Target

T AbsRise

T AbsFall

Device Output

T AbsRise (Max - Min)

T AbsFall (Max - Min)

Operational Air Gap

TPOS Air Gap

Valley

Tooth

Air Gap

TPOS Air Gap

Min

TPOS Air Gap

Range

TPOS Air Gap

Max

Phase Delay with RPM

RPM

Max RPM

Rev. 1.2 May 1, 2002

Page 5 of 12

115 Northeast Cutoff, Box 15036

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

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