ATS657 datasheet(4/15 Pages) ALLEGRO

4 / 15 page

Dynamic, Self-Calibrating, Threshold-Detecting, Differential

Speed and Direction Hall-Effect Gear Tooth Sensor IC

ATS657

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

OPERATING CHARACTERISTICS: Switchpoint Characteristics Valid over operating voltage and temperature ranges,

unless otherwise noted (refer to figure below)

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Target Frequency, Forward Rotation

fFWD

–

kHz

Target Frequency, Reverse Rotation

fREV

–

kHz

Target Frequency, Non-Direction Pulses*

fND

–

kHz

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

–70

–

Release Point

BRP

% of peak-to-peak VPROC referenced from

PDAC to NDAC, AG < AGmax

–30

–

*At power-on, rotational speed or vibration leading to a target frequency greater than 4 kHz may result in a constant high output state until true

direction is detected.

OPERATING CHARACTERISTICS: Output Pulse Characteristics* Valid over operating temperature range, unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Pulse Width, Forward Rotation

tw(FWD)

RL = 500 Ω, CL = 10 pF

μs

Pulse Width, Reverse Rotation

tw(REV)

RL = 500 Ω, CL = 10 pF

104

μs

Pulse Width, Non-Direction

tw(ND)

RL = 500 Ω, CL = 10 pF

153

180

207

μs

*Measured at a threshold of ( ICC(HIGH) + ICC(LOW)) / 2.

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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