A3280X 查看數據表（PDF） - Allegro MicroSystems

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A3280X

HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION

Allegro MicroSystems 

3185 THRU 3189

HALL-EFFECT LATCHES

FOR HIGH-TEMPERATURE

OPERATION

SENSOR LOCATIONS

(±0.005” [0.13 mm] die placement)

Package Designators “LT”

ACTIVE AREA DEPTH

0.0305"

0.775 mm

NOM

0.090"

2.27 mm

0.050"

1.27 mm

A

1

2

3

Dwg. MH-008-4C

Package Designators “UA”

ACTIVE AREA DEPTH

0.0195"

0.50 mm

NOM

0.083"

2.10 mm

0.060"

1.51 mm

A

BRANDED

SURFACE

1

2

3

Dwg. MH-011-4C

Although sensor location is accurate to three

sigma for a particular design, product improve-

ments may result in small changes to sensor

location.

OPERATION

In operation, the output transistor is OFF until the strength of the mag-

netic field perpendicular to the surface of the chip exceeds the threshold or

operate point (BOP). When the field strength exceeds BOP, the output transis-

tor switches ON and is capable of sinking 25 mA of current.

The output transistor switches OFF when magnetic field reversal results

in a magnetic flux density below the OFF threshold (BRP). This is illustrated

in the transfer characteristics graph (A3187* shown).

Note that the device latches; that is, a south pole of sufficient strength

will turn the device ON. Removal of the south pole will leave the device ON.

The presence of a north pole of sufficient strength is required to turn the

device OFF. Powering up in the absence of a magnetic field (less than BOP

and higher than BRP) will allow an indeterminate output state. The correct

state is warranted after the first excursion beyond BOP or BRP.

30 V

VBB

MAX

B RP

B OP

0

-B

0

FLUX DENSITY

VOUT(SAT)

+B

Dwg. GH-034-4

The simplest form of magnet that will operate these devices is a ring

magnet, as shown below. Other methods of operation are possible.

Allegro

Dwg. A-11,899

APPLICATIONS INFORMATION

Extensive applications information on magnets and Hall-effect sensors is

also available in the Allegro Integrated and Discrete Semiconductors Data

Book or Application Note 27701.

115 Northeast Cutoff, Box 15036

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

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