A1469LK-T Просмотр технического описания (PDF) - Allegro MicroSystems

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A1469LK-T

Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration

Allegro MicroSystems 

A1469

Three-Wire True Zero-Speed Differential Peak-Detecting

Sensor IC with Continuous Calibration

CHARACTERISTIC ALLOWABLE AIR GAP MOVEMENT

Allowable Air Gap Movement from TEAGCAL*

2.0

1.5

1.0

0.5

0

-0.5

-1.0

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

∆TEAGIN (mm)

*Data based on study performed using Allegro Reference

Target 60-0 ring magnet, and applicable to ring magnet

targets with similar magnetic characteristics.

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 target’s magnetic signature across the air gap range of move-

ment, and may not always be within specification throughout the

entire operating region (to AG(OPmax)).

The axis parameters for the chart are defined in the drawings

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

allowed to vary from the nominal installed air gap (TEAGCAL ,

panel a) within the range defined by an increase of ΔTEAGOUT =

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

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

the chart above.

Please note that after extreme cases of decrease in air gap, the

device may not switch when the air gap resumes the nominal

value. For example, if ΔTEAGIN = 2.75 mm, the chart shows

ΔTEAGOUT = –0.5 mm, meaning that the device can now switch

only in the air gap range of 0.5 to 2.75 mm inward from the

nominal air gap.

(a)

(b)

(c)

A1469

TEAG

CAL

A1469

TEAG

OUT

A1469

TEAG

IN

Allegro MicroSystems, LLC

7

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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