A3197LLT datasheet(5/12 Pages) ALLEGRO

Part #	A3197LLT

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

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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5 / 12 page

3197

PROTECTED, HIGH-TEMP.,

OPEN-COLLECTOR

HALL-EFFECT LATCH

www.allegromicro.com

26 V

MAX

0+B

0

FLUX DENSITY

Dwg. GH-034-2A

-B

RP

B

VOUT(SAT)

BB

V

OP

B

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.

TEST CIRCUIT AND TYPICAL APPLICATION

TO

µP

3

X

Dwg. EH-006A

VCC(UV) TO 26 V

WITH TRANSIENTS

L

R

L

C

REGULATED

< 26 V

VBB

VCC

BYPASS

C

2

1

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