A3196LU View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

Manufacturer

A3196LU

PROTECTED, HIGH-TEMPERATURE, OPEN-COLLECTOR HALL-EFFECT LATCH

Allegro MicroSystems 

OPERATION

In operation, the output transistor is OFF

until the strength of the magnetic field

perpendicular to the surface of the chip

exceeds the threshold or operate point (BOP).

When the field strength exceeds BOP, the

output transistor switches ON

(a logic low) and is capable of sinking

35 mA of current.

The output transistor switches OFF (a

logic high) when magnetic field reversal

results in a magnetic flux density below the

OFF threshold (BRP). This is illustrated in

the transfer characteristics graph. 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.

The switch points increase in sensitivity

with increasing temperature to compensate

for the typical ferrite magnet temperature

characteristic. The simplest form of magnet

that will operate these devices is a ring

magnet. Other methods of operation are

possible.

3197

PROTECTED, HIGH-TEMP.,

OPEN-COLLECTOR

HALL-EFFECT LATCH

TEST CIRCUIT AND TYPICAL APPLICATION

VCC(UV) TO 26 V

WITH TRANSIENTS

VCC

REGULATED

< 26 V

VBB

1

RL

3

TO µP

X

CBYPASS

CL

2

Dwg. EH-006A

26 V

VBB

MAX

B RP

B OP

0

-B

0

FLUX DENSITY

VOUT(SAT)

+B

Dwg. GH-034-2A

www.allegromicro.com

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