ATS684LSN datasheet(4/16 Pages) ALLEGRO

4 / 16 page

Two-Wire, Zero-Speed

Differential Gear Tooth Sensor IC

ATS684LSN

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Characteristics

Symbol

Test Conditions

Min.

Typ.[1]

Max.

Unit[2]

FUNCTIONAL CHARACTERISTICS

Operating Signal Range[9]

BSIG

Differential magnetic signal, duty cycle within

specification

–

1500

GPK-PK

Extended Operating Signal Range

BSIGEXT

Differential magnetic signal, output switching (no

missed edges), duty cycle not guaranteed

–

GPK-PK

Operational Air Gap Range

AGOP

Using Allegro Reference Target 60-0, duty cycle

within specification

0.5

–

2.5

Extended Operational Air Gap Range

AGEXT

Using Allegro Reference Target 60-0, output

switching (no missed edges), duty cycle not

guaranteed

–

3.0

Allowable User-Induced Differential

Offset

BDIFFEXT Operation within specification

±60

–

Duty Cycle Variation[10]

ΔD

Wobble < 0.5 mm, AG within specification

–

±10

Maximum Sudden Signal Amplitude

Change

BSIG(INST)

Instantaneous symmetric magnetic signal

amplitude change, measured as a percentage of

peak-to-peak BSIG, fOP < 500 Hz

–

Typical values are at TA = 25°C and VCC = 12 V. Performance may vary for individual units, within the specified maximum and minimum limits.

1 G (gauss) = 0.1 mT (millitesla).

Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.

Negative current is defined as conventional current coming out of (sourced from) the specified device terminal.

Measured from VCC ≥ VCC(min) to the time when the device is able to switch the output signal in response to a magnetic stimulus.

Please refer to the Functional Description, Power-On section.

Guaranteed by device charaterization.

For power-on frequency, fOP < 200 Hz. Higher power-on frequencies may result in more input magnetic cycles until full output edge accuracy is achieved, including

the possibility of missed output edges.

AGOP is dependent on the available magnetic field. The available field is dependent on target geometry and material, and should be independently characterized.

Target rotation from pin 3 to pin 1.

OPERATING CHARACTERISTICS (continued): VCC and TA within specif ication, unless otherwise noted

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