Datasheet > 1120_V12

1120_V12

更新时间： 2022-09-10 19:17:15

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描述
Chopper Stabilized Precision Hall Effect Switches

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1120_V12 数据手册

A1120, A1121, A1122

and A1125

Chopper Stabilized Precision Hall Effect Switches

Functional Description

give an indeterminate output state. The correct state is attained

Operation

after the first excursion beyond B_OPor B_RP

The output of the A1120, A1121, and A1122 devices switches

low (turns on) when a magnetic field perpendicular to the Hall

element exceeds the operate point threshold, B_OP(see panel A of

figure 1). When the magnetic field is reduced below the release

point, B_RP, the device output goes high (turns off). The output

of the A1125 devices switches high (turns off) when a magnetic

field perpendicular to the Hall element exceeds the operate point

threshold, B_OP(see panel B of figure 1). When the magnetic field

is reduced below the release point, B_RP, the device output goes

low (turns on).

Applications

It is strongly recommended that an external bypass capacitor be

connected (in close proximity to the Hall element) between the

supply and ground of the device to reduce external noise in the

application. As is shown in panel B of figure 1, a 0.1 μF capacitor

is typical.

Extensive applications information for Hall effect devicers is

available in:

After turn-on, the output voltage is V_OUT(SAT). The output tran-

sistor is capable of sinking current up to the short circuit current

limit, I_OM, which is a minimum of 30 mA.

• Hall-Effect IC Applications Guide, Application Note 27701

• Guidelines for Designing Subassemblies Using Hall-Effect

Devices, Application Note 27703.1

The difference in the magnetic operate and release points is the

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

clean switching of the output even in the presence of external

mechanical vibration and electrical noise. Powering-on the device

in the hysteresis range (less than B_OPand higher than B_RP) will

• Soldering Methods for Allegro’s Products – SMT and Through-

Hole, Application Note 26009

All are provided in Allegro Electronic Data Book, AMS-702, and

the Allegro Web site, www.allegromicro.com.

V_S

V+

V_CC

VCC

R_L

A112x

VOUT

Output

C_BYP

0.1 μF

V_OUT(SAT)

B+

GND

B+

B_HYS

(A)

B_HYS

(B)

(C)

Figure 1. Device switching behavior. In panels A and B, on the horizontal axis, the B+ direction indicates increasing south polarity magnetic field strength.

This behavior can be exhibited when using an electrical circuit such as that shown in panel C.

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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