ATS685 datasheet(4/15 Pages) ALLEGRO

4 / 15 page

Two-Wire, Zero Speed

Differential Gear Tooth Sensor IC

ATS685LSH

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Functional Characteristics

Operating Signal Range11

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 Variation12

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

–45–

1Typical values are at TA = 25°C and VCC = 12 V. Performance may vary for individual units, within the specified maximum and minimum limits.

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

3Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.

4Negative current is defined as conventional current coming out of (sourced from) the specified device terminal.

5Sustained voltages beyond the clamp voltage may cause permanent damage to the IC.

6Measured from VCC ≥ VCC(min) to the time when the device is able to switch the output signal in response to a magnetic stimulus.

7Please refer to the Functional Description, Power-On section.

8di is the difference between 10% of ICC(Low) and 90% of ICC(High). dt is the time period between those two points.

9CLOAD is the probe capacitance of the oscilloscope used to make the measurement.

10For 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.

11AGOP is dependent on the available magnetic field. The available field is dependent on target geometry and material, and should be independently

characterized. The field available from the reference target is given in the Reference Target table.

12Target rotation from pin 4 to pin 1.

OPERATING CHARACTERISTICS (continued) VCC and TA within specification, unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.1

Max.

Unit2

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