A3212EUA データシートの表示（PDF） - Allegro MicroSystems

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A3212EUA

MICROPOWER/ ULTRA-SENSITIVE HALL-EFFECT SWITCH

Allegro MicroSystems 

3212

MICROPOWER,

ULTRA-SENSITIVE

HALL-EFFECT SWITCH

FUNCTIONAL DESCRIPTION (cont'd)

Operation. The output of this device switches low (turns on)

when a magnetic field perpendicular to the Hall sensor exceeds

the operate point BOPS (or is less than BOPN). After turn-on, the

output is capable of sinking up to 1 mA and the output voltage is

VOUT(ON). When the magnetic field is reduced below the release

5V

point BRPS (or increased above BRPN), the device output switch-

MAX

es high (turns off). The difference in the magnetic operate and

release points is the hysteresis (Bhys) of the device. This built-in

hysteresis allows clean switching of the output even in the pres-

ence of external mechanical vibration and electrical noise.

As used here, negative flux densities are defined as less than

zero (algebraic convention), i.e., -50 G is less than +10 G.

Applications. Allegro's pole-independent sensing technique

allows for operation with either a north pole or south pole mag-

net orientation, enhancing the manufacturability of the device.

The state-of-the-art technology provides the same output polarity

0

for either pole face.

-B

It is strongly recommended that an external bypass capacitor

be connected (in close proximity to the Hall sensor) between the

supply and ground of the device to reduce both external noise

and noise generated by the chopper-stabilization technique. This

is especially true due to the relatively high impedance of battery

supplies.

The simplest form of magnet that will operate these devices

is a bar magnet with either pole near the branded surface of the

device. Many other methods of operation are possible. Exten-

sive applications information for Hall-effect sensors is available

in:

• Hall-Effect IC Applications Guide, Application Note 27701;

• Hall-Effect Devices: Soldering, Gluing, Potting, Encapsu-

lating, and Lead Forming, Application Note 27703.1;

• Soldering of Through-Hole Hall-Sensor Dervices, Application

Note 27703; and

• Soldering of Surface-Mount Hall-Sensor Devices, Application

Note 27703.2.

All are provided at

www.allegromicro.com

B OPN

OUTPUT OFF

B OPS

BRPN

BRPS

0

MAGNETIC FLUX

OUTPUT ON

+B

Dwg. GH-043-1

10 pF

OUTPUT

0.1 µF

SUPPLY

(3 V BATTERY)

Dwg. EH-013-2

www.allegromicro.com

7

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