a1147euati-t Allegro MicroSystems, Inc., a1147euati-t Datasheet

a1147euati-t

Manufacturer Part Number

a1147euati-t

Description

Low Current Ultrasensitive Two-wire Chopper-stabilized Unipolar Hall Effect Switches

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.A1147EUATI-T.pdf (12 pages)

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Features and Benefits

▪ Chopper stabilization

▪ Factory programmed at end-of-line for optimized

▪ On-chip protection

Packages: 3 pin SOT23W (suffix LH), and

3 pin SIP (suffix UA)

Not to scale

A1147-DS, Rev. 8

switchpoints

▫ Low switchpoint drift over operating

▫ Low sensitivity to stress

▫ Supply transient protection

▫ Reverse-battery protection

▫ On-board voltage regulator

▫ 3.5 to 24 V operation

temperature range

Low Current Ultrasensitive Two-Wire Chopper-Stabilized

V+

0.01 uF

VCC

Functional Block Diagram

Clock/Logic

Amp

Low-Pass

Filter

Regulator

Unipolar Hall Effect Switches

Description

The A1147 and A1148 devices are two-wire, unipolar, Hall

effect switches that are factory-programmed at end-of-line to

optimize ultrasensitive magnetic switchpoint accuracy. These

devices use a patented high frequency chopper-stabilization

technique, produced using the Allegro advanced BiCMOS

wafer fabrication process, to achieve magnetic stability and

to eliminate offset inherent in single-element devices exposed

to harsh application environments.

Commonly found in a number of automotive applications,

these switches are utilized to sense seat track position, seat

belt buckle presence, hood/trunk latching, and shift selector

position. Two-wire unipolar switches, such as the A1147

and A1148, are particularly advantageous in price-sensitive

applications because they require one less wire for operation

than do switches with the more traditional open-collector output.

Additionally, the system designer inherently gains diagnostics

because there is always output current flowing, which should

be in either of two narrow ranges. Any current level not within

these ranges indicates a fault condition. These devices also

Continued on the next page…

To All Subcircuits

Package UA Only

GND

A1147 and A1148

GND

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