A1244LLHLX-I2-T Allegro Micro Systems, Inc., A1244LLHLX-I2-T Datasheet

A1244LLHLX-I2-T

Manufacturer Part Number

A1244LLHLX-I2-T

Description

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A1244LUA-I1-T.pdf (12 pages)

Specifications of A1244LLHLX-I2-T

Pack_quantity

10000

Comm_code

85415000

Lead_time

168

Current page: 1 of 12
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Features and Benefits

▪ High speed, 4-phase chopper stabilization

▪ On-chip protection

▪ On-board voltage regulator

▪ Solid-state reliability

▪ Robust EMC and ESD performance

▪ Industry leading ISO 7637-2 performance through use of

Packages:

Not to scale

A1244-DS

▫ Low switchpoint drift throughout temperature range

▫ Low sensitivity to thermal and mechanical stresses

▫ Supply transient protection

▫ Reverse battery protection

▫ 3.0 to 24 V operation

proprietary, 40-V clamping structures

3-pin ultramini SIP

1.5 mm × 4 mm × 3 mm

(suffix UA)

V+

0.01 μF

VCC

Chopper-Stabilized, Two Wire Hall-Effect Latch

Approximate footprint

3-pin SOT23-W

2 mm × 3 mm × 1 mm

(suffix LH)

Functional Block Diagram

Clock/Logic

Regula

Amp

tor

To all subcircuits

Description

The A1244 is a two-wire Hall-effect latch. The devices are

produced on the Allegro

process, which implements a patented high frequency, 4-phase,

chopper-stabilization technique. This technique achieves

magnetic stability over the full operating temperature range,

and eliminates offsets inherent in devices with a single Hall

element that are exposed to harsh application environments.

Two-wire latches are particularly advantageous in cost-sensitive

applications because they require one less wire for operation

versus the more traditional open-collector output switches.

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.

The Hall-effect latch will be in the high output current state

in the presence of a magnetic south polarity field of sufficient

magnitude and will remain in this state until a sufficient north

polarity field is present.

The device is offered in two package styles. The LH is a

SOT-23W style, miniature low profile package for surface-

mount applications. The UA is a 3-pin ultra-mini single inline

package (SIP) for through-hole mounting. Both packages are

lead (Pb) free, with 100% matte tin leadframe plating.

Low-Pass

Filter

Schmitt

Trigger

UA package only

Polarity

GND

advanced BiCMOS wafer fabrication

GND

A1244

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