A1244 Ver la hoja de datos (PDF) - Allegro MicroSystems

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A1244

Chopper-Stabilized, Two Wire Hall Effect Latch

Allegro MicroSystems 

A1244

Chopper-Stabilized, Two Wire

Hall-Effect Latch

Functional Description

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.

I+

ICC(H)

0

B–

BHYS

ICC(L)

B+

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).

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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