ATS668LSM datasheet(5/13 Pages) ALLEGRO

5 / 13 page

True Zero-Speed High-Accuracy

Gear Tooth Sensor IC

ATS668LSM

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

FUNCTIONAL CHARACTERISTICS

Characteristics

Symbol

Note

Min.

Typ.

Max.

Unit

POWER ON

Power-On State

POS

VOUT state at t > tPO; see Figure 1

–

High

–

Power-On Time [1]

tPO

fop < 100 Hz

–

AIR GAP

Operating Air Gap Range

Guaranteed to operate within specification

0.5

–

2.5

Extended Air Gap Range

Switching only—not guaranteed to operate

within spec

2.5

–

OFFSET

Dynamic Offset Cancellation

BDIFFEXT Allowable user-induced offset

±60

–

CALIBRATION

Initial Calibration [2]

CALI

Quantity of rising output edges required for

accurate edge detection

–

edge

SWITCHING

Operating Speed

fOP

–

kHz

Analog Signal Bandwidth

–

kHz

Operate Point

–

Release Point

–

OUTPUT DUTY CYCLE [3]

Output Duty Cycle

AG = 0.5 mm to 2.5 mm, Pin 3 to 1 target rotation

–

AG = 2.5 mm to 3.0 mm, Pin 3 to 1 target rotation

–

Power-On Time includes the time required to complete the internal automatic offset adjust. DAC is then ready for peak acquisition.

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.

Measured at fOP = 2 kHz. Output rise and fall times should be considered when measuring duty cycle.

Figure 4: Definition of Terms for Switchpoints

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

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