A1185 データシートの表示（PDF） - Allegro MicroSystems

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A1185

Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches

Allegro MicroSystems 

A1185 and

A1186

Ultrasensitive Two-Wire Field-Programmable

Chopper-Stabilized Unipolar Hall Effect Switches

Functional Description

Operation

The output, ICC, of the A1185 switches low after the magnetic

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

When the magnetic field is reduced to below the release point

threshold, BRP, the device output goes high. The differences

between the magnetic operate and release point is called the

hysteresis of the device, BHYS. This built-in hysteresis allows

clean switching of the output even in the presence of external

mechanical vibration and electrical noise. The A1186 device

switches with opposite polarity for similar BOP and BRP values,

in comparison to the A1185 (see figure 1).

I+

ICC(H)

I+

ICC(H)

0

B–

BHYS

ICC(L)

B+

0

B–

BHYS

ICC(L)

B+

(A) A1185

(B) A1186

Figure 1. Alternative switching behaviors are available in the A118x 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.

6

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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