ATS128 datasheet(21/25 Pages) ALLEGRO

21 / 25 page

Highly Programmable, Back-Biased,

Hall-Effect Switch with TPOS Functionality

ATS128LSE

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Figure 16. Positive Trim, Up-Counting to find BRP.

Figure 17. Positive Trim, Down-Counting to find BOP.

BOP Positive, Trim Up-Counting Register

BOP Positive, Trim Down-Counting Register

BOP(max)

B(actual)

B+ (south)

B– (north)

BOP(max)

B+ (south)

B– (north)

BOP(min)

High

Low

High

Low

BOP(min)

Try Mode, Bit Field Code

255

Try Mode, Bit Field Code

255

BRP

BOP Setpoint

BRP

BOP Setpoint

BRP

BOP Setpoint

BRP

BOP Setpoint

As the code is increased, BOP is decreased. When BOP is less

than Bactual the output changes state from high to low. (See D in

figure 17.) Record the BOP selection for later use. Because when

using the Down-Counting register the BOP selection is automati-

cally inverted, therefore the recorded value is equal to the maxi-

mum value minus the addressed code.

The air gap mechanical position is also a factor in determining

the magnetic switchpoints. As seen in figure 18, at smaller air

gaps the change in flux density versus change in displacement

is large, represented by a steeply sloped function, and there is

relatively little difference between the target displacements at BOP

and BRP. At larger air gaps, however, the change function is shal-

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