A1645LK-I2【PDF 6/14 页】IC SENSOR HALL EFFECT AC 4-SIP

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Two-Wire True Zero-Speed Miniature Differential

Peak-Detecting Sensor IC with Continuous Calibration

A1642

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

?SPAN class="pst A1645LK-I2_2596879_5">TEAG

(mm)

Allowable Air Gap Movement from TEAG

CAL

-0.2

0.2

0.4

0.6

0.8

1.0

1.2

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

Characteristic Allowable Air Gap Movement

The colored area in the chart above shows the region of allow-

able air gap movement within which the device will continue

output switching. The output duty cycle is wholly dependent on

the targets magnetic signature across the air gap range of move-

ment, and may not always be within speci cation throughout the

entire operating region (to AG

(OPmax)

The axis parameters for the chart are de ned in the drawings

below. As an example, assume the case where the air gap is

allowed to vary from the nominal installed air gap (TEAG

CAL

panel a) within the range de ned by an increase of DTEAG

OUT

0.35 mm (shown in panel b), and a decrease of DTEAG

0.65 mm (shown in panel c). This case is plotted with an x in

the chart above.

TEAG

A1642

TEAG

OUT

(a)

A1642

TEAG

CAL

(b)

(c)

*Data based on study performed using spur gear reference target 60-0, and

applicable to ring magnet targets with similar magnetic characteristics.

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