ATS667LSG datasheet(4/14 Pages) ALLEGRO

4 / 14 page

True Zero-Speed, High Accuracy Gear Tooth Sensor IC

ATS667LSG

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

OPERATING CHARACTERISTICS (continued) Valid over operating voltage and temperature ranges; unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.1

Max.

Unit

Switchpoint Characteristics

Operational Speed

SROT

Allegro 60–0 Reference Target

–

12000

rpm

Bandwidth

f-3dB

Cutoff frequency for low-pass filter

–

kHz

Operate Point

BOP

% of peak-to-peak VPROC referenced from

PDAC to NDAC, AG < AGmax, VOUT high to low

–

Release Point

BRP

% of peak-to-peak VPROC referenced from

PDAC to NDAC, AG < AGmax , VOUT low to high

–

Running Mode Lockout Enable (LOE)

VLOE(RM)

VPROC(PK-PK) < VLOE(RM) = output switching

disabled

–

100

–

Running Mode Lockout Release (LOR)

VLOR(RM)

VPROC(PK-PK) < VLOR(RM) = output switching

enabled

–

220

–

1Typical data is at VCC = 12 V and TA = 25°C, unless otherwise noted. Performance may vary for individual units, within the specified maximum and

minimum limits.

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

3 Power-On Time is the time required to complete the internal Automatic Offset Adjust; the DACs are then ready for peak acquisition.

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

5The device compensates for magnetic and installation offsets. Offsets greater than specification in gauss may cause inaccuracies in the output.

6For power-on SROT ≤ 200 rpm, edges are sensed target mechanical edges (see figure Definitions of Terms for Switchpoints).

7Operational Air Gap Range is dependent on the available magnetic field. The available field is target geometry and material dependent and should be

independently characterized. The field available from the Allegro 60-0 reference target is given in the reference target parameter section.

8The repeatability specification is based on statistical evaluation of a sample population, evaluated at 1000 Hz. Repeatability is measured at 150°C

because the lowest signal-to-noise ratio for the VPROC signal occurs at elevated temperatures. Therefore, the worst-case repeatability for the device

will also occur at elevated temperatures.

9Single maximum allowable air gap change in outward direction (increase in air gap).

Valley

Tooth

Forward

Reverse

–B

–V

BOP(FWD)b

VPROC(BOP)

VPROC(BRP)

BRP(FWD)

BOP %

BRP %

100 %

BOP(REV)b

BRP(REV)

Sensed Edgea

aSensed Edge: leading (rising) mechanical edge in forward rotation, trailing (falling) mechanical edge in reverse rotation

bBOP(FWD) triggers the output transition during forward rotation, and BOP(REV) triggers the output transition during reverse rotation

Definitions of Terms for Switchpoints

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