A1156(2012) 데이터 시트보기 (PDF) - Allegro MicroSystems

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A1156
(Rev.:2012)

Chopper-Stabilized, Two Wire Hall-Effect Switches

Allegro MicroSystems 

A1150, A1152, A1153, A1155,

A1156, A1157, and A1158

Chopper-Stabilized, Two Wire

Hall-Effect Switches

Functional Description

The A1150, A1152, A1155, and A1157 output, ICC, switches low

after the magnetic field at the Hall sensor IC exceeds the oper-

ate point threshold, BOP. When the magnetic field is reduced to

below the release point threshold, BRP, the device output goes

high. This is shown in figure 1, panel A.

In the case of the reverse output polarity, as in the A1153, A1156,

and A1158, the device output 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 (panel B).

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)

I+

ICC(H)

0

B–

BHYS

ICC(L)

B+

(A) Hysteresis curve for A1150, A1152, A1155, and A1157

0

B–

ICC(L)

B+

BHYS

(B) Hysteresis curve for A1153, A1156, and A1158

Figure 1. Alternative switching behaviors are available in the A115x 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).

Allegro MicroSystems, Inc.

7

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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