ATS672LSB datasheet(4/12 Pages) ALLEGRO

4 / 12 page

ATS672LSB

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

Preliminary – Subject to Change

Rev. 1.2 May 1, 2002

Page 4 of 12

115 Northeast Cutoff, Box 15036

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

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

tICRel

Rising and falling edge, RPM = 1000

during initial calibration

gear eccentricity < 0.1 mm

3.0

6.0

tRel

Rising mechanical edge

after initial calibration, RPM = 1000

gear eccentricity < 0.1 mm

0.3

0.6

1Relative Timing Accuracy

tRel

Falling mechanical edge

after initial calibration, RPM = 1000

gear eccentricity < 0.1 mm

0.5

0.8

tAbsRise

Rising mechanical edge

air gap: 1.5mm, temperature: 25°C

RPM: 1000

-0.2

2Absolute Timing Accuracy

tAbsFall

Falling mechanical edge

air gap: 1.5mm, temperature: 25°C

RPM: 1000

+0.6

3Phase Delay

tRelSpeed

After initial calibration

air gap: 1.5 mm, temperature: 25°C

6.66

x 10

-5°

/ RPM

4TPOS Air Gap Min

ATS672LSB – LT and HT

AGMin

Valleys may be detected as teeth:

incorrect TPOS

0.5

5TPOS Air Gap Range

ATS672LSB – LT and HT

AGTPOS

Distance for correct TPOS functionality

0.5

2.25

6TPOS Air Gap Max

ATS672LSB – LT and HT

AGMax

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

tθE

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.

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