ATS682LSH datasheet(13/16 Pages) ALLEGRO

13 / 16 page

Miniature, Two-Wire, True Zero Speed

Differential Peak-Detecting Sensor IC

ATS682LSH

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Characteristic Allowable Signal Amplitude Variation

The colored area in figure 10 shows BSOA, the safe operating

area of allowable magnetic signal amplitude within which the IC

will continue output switching. The output duty cycle is wholly

dependent on the magnetic signature of the target across the air

gap range of movement, and may not always be within specifi-

cation throughout the entire operating region (to BDIFF(max)).

Signal amplitude changes may be due to deflection (relative air

gap change between Hall element and target), target eccentricity,

magnet temperature coefficient or a combination thereof.

The axis parameters for the chart in figure 10 are defined in fig-

ure 11. As an example, assume the case where the signal changes

from the nominal at the installed air gap (BCAL) within the range

defined by an increase factor of BDIFF(max) / BCAL = 3.0, and a

decrease of BDIFF(lim) / BCAL = 0.75. This case is plotted with an

“x” in figure 10.

Figure 10. Allowable Signal Amplitude Change chart

BDIFF(max) / BCAL

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

23456789

Guard-banded

Nominal

Safe Operating

Area

BCAL

BDIFF(max)

BDIFF(lim)

Figure 11. Illustration of BCAL, BDIFF(max) and BDIFF(lim) for amplitude

variation discussion. BCAL is the magnetic amplitude at the IC during its

calibration cycle BDIFF(max) and BDIFF(lim) are the maximum and minimum

magnetic amplitudes during IC operation.

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