ATS645LSH datasheet(4/14 Pages) ALLEGRO

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True Zero Speed Miniature Differential Peak-

Detecting Gear Tooth Sensor

ATS645LSH

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

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 – 3dB

–

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 CHARACTERISTICS5

Operational Air Gap Range6

∆DC within speciﬁcation

0.5

–

2.75

Maximum Operational Air Gap

Range

AGOP(max)

Output switching (no missed edges); ∆DC not

guaranteed

––3

Duty Cycle Variation7

∆DC

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

max., min., AG within speciﬁcation

Operating Magnetic Flux Density

Differential8

BAG(p-p) Operating within speciﬁcation

–

1000

Minimum Operating Signal

SigOP(min)

Output switching (no missed edges); ∆DC 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.

3Power-On Time includes the time required to complete the internal automatic offset adjust. The DACs are then ready for peak acquisition.

4dI 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.

5Functional characteristics valid only if magnetic offset is within the speciﬁed range for Allowable User Induced Differential Offset.

6AG 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.

7Duty cycle speciﬁcation may not be met if the magnetic signal during the calibration period is not representative of the installation air gap.

8In 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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