A1244 datasheet(7/12 Pages) ALLEGRO

7 / 12 page

Functional Description

BHYS

ICC(H)

ICC(L)

B+

I+

B–

The A1244 output, ICC, switches high after the magnetic field

at the Hall sensor IC exceeds the operate point threshold, BOP.

When the magnetic field is reduced to below the release point

threshold, BRP, the device output goes low. This is shown in

figure 1.

The difference between the magnetic operate and release points

is called the hysteresis of the device, BHYS. This built-in hyster-

esis allows clean switching of the output even in the presence of

external mechanical vibration and electrical noise.

Figure 1. Hysteresis for the A1244. On the horizontal axis, the B+ direc-

tion indicates increasing south polarity magnetic field strength, and the

B– direction indicates decreasing south polarity field strength (including

the case of increasing north polarity).

Chopper-Stabilized, Two Wire

Hall-Effect Latch

A1244

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

A1244 Datasheet(PDF) 7 Page - Allegro MicroSystems