ATS642LSH datasheet(4/16 Pages) ALLEGRO

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ATS642LSH-DS

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor

ATS642LSH

OPERATING CHARACTERISTICS

(continued) using reference target 60-0, TA and VCC within speciﬁcation, unless otherwise noted

Characteristic

Symbol

Test Conditions

Min.

Typ.1

Max.

Units

SWITCHPOINT CHARACTERISTICS

Rotation Speed

SROT

Reference Target 60-0

–

8,000

rpm

Analog Signal Bandwidth

Equivalent to f – 3 dB

–

kHz

Operate Point

BOP

Transitioning from ICC(High) to ICC(Low); positive peak

referenced; AG < AGMAX

–

120

–

Release Point

BRP

Transitioning from ICC(Low) to ICC(High); negative peak

referenced; AG < AGMAX

–

120

–

CALIBRATION

Initial Calibration

Quantity of rising output (current) edges required for

accurate edge detection

–

Edge

DAC CHARACTERISTICS

Allowable User-Induced Differential

Offset

Output switching only; may not meet datasheet speci-

ﬁcations

–

±60

–

FUNCTIONAL CHARACTERISTICS6

Operational Air Gap Range7

ΔDC within speciﬁcation

0.5

–

2.75

Maximum Operational Air Gap

Range

AGOP(max)

Output switching (no missed edges); ΔDC not

guaranteed

––3

Duty Cycle Variation

ΔDC

Wobble < 0.5 mm; Typical value at AG = 1.5 mm, for

max., min., AG within speciﬁcation

–

Duty Cycle Pitch Variance8

EDC

AG = 1.5 mm

–

±1.5

–

Operating Signal Range9

Sig

Operating within speciﬁcation

–

1000

Minimum Operating Signal

SigOP(min)

Output switching (no missed edges); ΔDC not

guaranteed

–

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

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

3Please refer to Sensor Operation section, page 13.

4Power-On Time includes the time required to complete the internal automatic offset adjust. The DACs are then ready for peak acquisition.

5dI is the difference between 10% of ICC(Low) and 90% of ICC(High), and dt is time period between those two points.

Note: di/dt is dependent upon the value of the bypass capacitor, if one is used.

6Functional characteristics valid only if magnetic offset is within the speciﬁed range for Allowable User Induced Differential Offset.

7AG 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 parameter section of the datasheet.

8EDC represents the difference between consecutive duty cycles, DC(n) - DC(n-1); Mean ± 3-sigma.

9In order to remain in speciﬁcation, the magnetic gradient must induce an operating signal greater than the minimum value speciﬁed. This includes the

effect of target wobble.

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