A1122ELHLT-T Allegro Microsystems Inc, A1122ELHLT-T Datasheet

A1122ELHLT-T

Manufacturer Part Number

A1122ELHLT-T

Description

GENERAL PURPOSE UNIPOLAR SWITCH

Manufacturer

Allegro Microsystems Inc

Type

Unipolar Switchr

Series

-r

Datasheet

1.A1120LLHLT-T.pdf (14 pages)

Specifications of A1122ELHLT-T

Sensing Range

200G Trip, 110G Release

Voltage - Supply

3 V ~ 24 V

Current - Supply

4mA

Current - Output (max)

60mA

Output Type

Digital, Open Collector

Features

High Temperature

Operating Temperature

-40°C ~ 85°C

Package / Case

SOT-23W

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Features and Benefits

▪ Unipolar switchpoints

▪ Resistant to physical stress

▪ Superior temperature stability

▪ Output short-circuit protection

▪ Operation from unregulated supply

▪ Reverse battery protection

▪ Solid-state reliability

▪ Small package sizes

Packages:

A1120-DS, Rev. 12

3-pin SOT23W (suffix LH)

Not to scale

VCC

Chopper Stabilized Precision Hall Effect Switches

3-pin SIP (suffix UA)

Functional Block Diagram

Amp

Low-Pass

Filter

Description

The A1120, A1121, A1122, and A1125 Hall-effect, unipolar

switches are extremely temperature-stable and stress-resistant

sensor ICs, especially suited for operation over extended

temperature ranges to 150°C. Superior high-temperature

performance is made possible through dynamic offset

cancellation, which reduces the residual offset voltage normally

caused by device overmolding, temperature dependencies, and

thermal stress.

Each device includes on a single silicon chip a voltage regulator,

Hall-voltage generator, small-signal amplifier, chopper

stabilization, Schmitt trigger, and a short-circuit protected

open-drain output to sink up to 25 mA.

An on-board regulator permits operation with supply voltages

of 3 to 24 V. The advantage of operating down to 3 V is that

the device can be used in 3 V applications or with additional

external resistance in series with the supply pin for greater

protection against high voltage transient events.

For the A1120, A1121, and A1122, a south pole of sufficient

strength turns the output on. Removal of the magnetic field

turns the output off. The A1125 is complementary, in that for

these devices, a south pole turns the A1125 output off, and

removal of the magnetic field turns the output on.

Two package styles provide a magnetically optimized package

for most applications. Package type LH is a modified SOT23W,

surface mount package, while UA is a three-lead ultra-mini SIP

for through-hole mounting. Each package type is lead (Pb) free

(suffix, –T), with a 100% matte tin plated leadframe.

A1120, A1121, A1122, and A1125

Regulator

To All Subcircuits

Current Limit

Control

GND

VOUT

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A1122ELHLT-T Summary of contents

Page 1

Chopper Stabilized Precision Hall Effect Switches Features and Benefits ▪ Unipolar switchpoints ▪ Resistant to physical stress ▪ Superior temperature stability ▪ Output short-circuit protection ▪ Operation from unregulated supply ▪ Reverse battery protection ▪ Solid-state reliability ▪ Small package ...

Page 2

... A1121LLHLX-T 13-in. reel, 10000 pieces/reel A1121LLHLT-T 2 7-in. reel, 3000 pieces/reel A1121LUA-T Bulk, 500 pieces/bag A1122ELHLX-T 13-in. reel, 10000 pieces/reel 2 A1122ELHLT-T 7-in. reel, 3000 pieces/reel A1122EUA-T Bulk, 500 pieces/bag A1122LLHLX-T 13-in. reel, 10000 pieces/reel A1122LLHLT-T 2 7-in. reel, 3000 pieces/reel A1122LUA-T Bulk, 500 pieces/bag A1125ELHLX-T 13-in ...

Page 3

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 Absolute Maximum Ratings Characteristic Forward Supply Voltage Reverse Supply Voltage Output Off Voltage Continuous Output Current Reverse Output Current Operating Ambient Temperature Maximum Junction Temperature Storage Temperature Package LH ...

Page 4

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 ELECTRICAL CHARACTERISTICS Characteristics Electrical Characteristics Forward Supply Voltage Output Leakage Current Output Saturation Voltage Output Current Limit 3 Power-On Time Chopping Frequency 3,4 Output Rise Time 3,4 Output Fall ...

Page 5

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance Symbol Package LH, 1-layer PCB with copper limited to solder pads Package LH, 2-layer ...

Page 6

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 Average Supply Current (On) versus Ambient Temperature 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0 ...

Page 7

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 Average Operate Point versus Ambient Temperature -60 -40 - (°C) A Average ...

Page 8

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 Operate Point versus Ambient Temperature 140 130 120 110 100 (°C) A ...

Page 9

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 Operate Point versus Ambient Temperature 200 190 180 170 160 150 140 130 120 - (°C) A Release ...

Page 10

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 Operation The output of the A1120, A1121, and A1122 devices switches low (turns on) when a magnetic field perpendicular to the Hall element exceeds the operate point threshold, B ...

Page 11

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 Chopper Stabilization Technique When using Hall effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the Hall element. This voltage is disproportionally small ...

Page 12

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 Power Derating The device must be operated below the maximum junction temperature of the device Under certain combinations of J(max) peak conditions, reliable operation may require derating ...

Page 13

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 +0.12 2.98 –0.08 3 +0.10 2.90 –0. 10° REF 0.95 BSC For Reference Only; not for tooling use (reference dwg. 802840) Dimensions in millimeters Dimensions exclusive of ...

Page 14

A1120, A1121, A1122 Chopper Stabilized Precision Hall Effect Switches and A1125 4.09 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 1 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2009-2010, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from ...

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