A1148LUA-T【PDF 7/13 页】IC SWITCH HALL EFFECT UNI 3-SIP

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Low Current Ultrasensitive Two-Wire

Chopper-Stabilized Unipolar Hall Effect Switches

A1147 and

A1148

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Functional Description

HYS

CC(H)

CC(L)

B+

I+

(A) A1147

HYS

CC(H)

CC(L)

B+

I+

(B) A1148

Operation

The output, I

, of the A1147 device switches low after the

magnetic field at the Hall element exceeds the operate point

threshold, B

. When the magnetic field is reduced to below the

release point threshold, B

, the device output goes high. The

differences between the magnetic operate and release point is

called the hysteresis of the device, B

HYS

. This built-in hysteresis

allows clean switching of the output even in the presence of

external mechanical vibration and electrical noise. The A1148

device switches with opposite polarity for similar B

and B

values, in comparison to the A1147 (see figure 1).

Figure 1. Alternative switching behaviors are available in the A114x device family. On the horizontal axis, the B+ direction indicates

increasing south polarity magnetic field strength, and the B direction indicates decreasing south polarity field strength (including the

case of increasing north polarity).

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