ATS657 datasheet(5/15 Pages) ALLEGRO

5 / 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

Tooth

Valley

Definition of Terms for Input Characteristics

VPROC(BOP)

VPROC(BRP)

VSP

[BOP]

[BRP]

VPROC(pk-pk)

TVPROC

VPROC = the processed analog signal of the sinusoidal magnetic input (per channel)

Ttooth = period of 2 successive sensed target edges

VSP

TTOOTH

VSP(sep) =

VSP

VPROC(pk-pk)

OPERATING CHARACTERISTICS: Input Characteristics Valid over operating temperature range and using Reference

Target 60-0, unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Operating Input Range1

BDIFF

Differential magnetic signal; correct direction

output on 6th edge

–

1200

Gpk-pk

Maximum Operation Air Gap1

AGmax

Correct direction output on 6th edge

–

2.2

Vibration Immunity (Startup)

ErrVIB(SU)

Allowed rotation detected due to vibration;

TTOOTH = period between 2 successive sensed

edges, sinusoidal signal;

ΔTA<10°C; BDIFF(AG)=0

TTOOTH

––

–

Vibration Immunity (Running mode)2

ErrVIB

Allowed rotation detected due to vibration;

TTOOTH = period between 2 successive sensed

edges, sinusoidal signal;

ΔTA<10°C; BDIFF(AG)=0

TTOOTH

× 0.5

––

–

Maximum Sudden Air Gap Change

Induced Signal Reduction3,4

ΔBDIFF(AG)

Differential magnetic signal reduction due to

instantaneous air gap change; symmetrical

signal reduction, target frequency < 500 Hz

–

%pk-pk

Axial / Radial Runout / Wobble Induced

Signal Reduction5,6

ΔBDIFF(RO)

Differential magnetic signal reduction due to

instantaneous runout per edge; symmetrical

signal reduction, multiple edges

––

%pk-pk

Relative Repeatability7

TθE

Differential magnetic signal, BDIFF = 100 Gpk-pk,

ideal sinusoidal signal, TA = 150°C, Reference

Target rotational speed = 1000 rpm (f = 1000 Hz)

–

0.12

–

deg.

Switchpoint Separation

VSP(sep)

Minimum separation between channels as

a percentage of VPROC amplitude at each

switchpoint (see figure below)

–

1Under certain extreme conditions, especially for smaller differential magnetic signals, the device may require more than 6 edges to output correct

direction on startup. Please contact the Allegro factory for assistance when using this device.

2Small amplitude vibration while in Running mode may result in one additional direction pulse, prior to non-direction pulse. See section Running Small

Amplitude Vibration Detection for details.

3If the minimum VSP(sep) is not maintained after a sudden air gap change, output may be blanked or non-direction pulses may occur.

4Sudden air gap change during startup may increase the quantity of edges required to get correct direction pulses.

5If the minimum VSP(sep) is not maintained, output may be blanked or non-direction pulses may occur.

6Minimum VPROC(pk-pk) signal of 200 mV and minimum VSP(sep) must be maintained

7The repeatability specification is based on statistical evaluation of a sample population, evaluated at 1000 Hz.

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