A1227LLTTR-T Allegro Microsystems Inc, A1227LLTTR-T Datasheet

HALL EFFECT LATCH FOR HIGH TEMPERATURE OPERATION

A1227LLTTR-T

Manufacturer Part Number

A1227LLTTR-T

Description

HALL EFFECT LATCH FOR HIGH TEMPERATURE OPERATION

Manufacturer

Allegro Microsystems Inc

Type

Bipolar Latchr

Datasheet

1.A1229LLTTR-T.pdf (12 pages)

Specifications of A1227LLTTR-T

Sensing Range

150G Trip, -150G Release

Voltage - Supply

3.8 V ~ 24 V

Current - Supply

6mA

Current - Output (max)

25mA

Output Type

Digital, Open Drain

Features

Regulated Voltage

Operating Temperature

-40°C ~ 150°C

Package / Case

SOT-89-3

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

620-1350-2

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Features and Benefits

▪ Symmetrical switchpoints

▪ Superior temperature stability

▪ Operation from unregulated supply

▪ Open-drain 25 mA output

▪ Reverse Battery protection

▪ Activate with small, commercially available

▪ Solid-state reliability

▪ Small size

▪ Resistant to physical stress

▪ Enhanced ESD structures result in 8 kV HBM ESD

▪ Internal protection circuits enable 40 V load dump

Packages: 3-pin SOT89 (suffix LT) and

3-pin SIP (suffix UA)

Not to scale

A1225-DS

permanent magnets

performance without external protection components

compliance without external protection components

VCC

Hall Effect Latch for High Temperature Operation

AMP

Regulator

Functional Block Diagram

Clock / Logic

Anti-aliasing

LP-Filter

Description

These Hall-effect latches 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 a novel

Schmitt trigger circuit that maintains operate and release

point symmetry by compensating for temperature changes

in the Hall element. Additionally, internal compensation

provides magnetic switchpoints that become more sensitive

with temperature, hence offsetting the usual degradation of

the magnetic field with temperature. The symmetry capability

makes these devices ideal for use in pulse-counting applications

where duty cycle is an important parameter. The three basic

devices (A1225, A1227, and A1229) are identical except for

magnetic switchpoints.

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

Hall-voltage generator, temperature compensation circuit,

signal amplifier, Schmitt trigger, and a buffered open-drain

output to sink up to 25 mA. The on-board regulator permits

operation with supply voltages of 3.8 to 24 V.

The first character of the part number suffix determines the

device operating temperature range. Suffix L is for –40°C to

150°C. Two package styles provide a magnetically optimized

package for most applications. Suffix LT is a miniature SOT89/

TO-243AA transistor package for surface-mount applications,

suffix UA is a three-lead ultra-mini-SIP. Both packages are lead

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

A1225, A1227, and A1229

To All Subcircuits

Tuned Filter

GND

VOUT

Related parts for A1227LLTTR-T

A1227LLTTR-T Summary of contents

Page 1

Hall Effect Latch for High Temperature Operation Features and Benefits ▪ Symmetrical switchpoints ▪ Superior temperature stability ▪ Operation from unregulated supply ▪ Open-drain 25 mA output ▪ Reverse Battery protection ▪ Activate with small, commercially available permanent magnets ▪ ...

Page 2

... A1229 and Selection Guide * Part Number Packing A1225LLTTR-T 7-in. reel, 1000 pieces/reel A1225LUA-T Bulk, 500 pieces/bag A1227LLTTR-T 7-in. reel, 1000 pieces/reel A1227LUA-T Bulk, 500 pieces/bag A1229LLTTR-T 7-in. reel, 1000 pieces/reel A1229LUA-T Bulk, 500 pieces/bag *Contact Allegro ® for additional packaging options. ...

Page 3

A1225, A1227 Hall Effect Latch for High Temperature Operation A1229 and ELECTRICAL CHARACTERISTICS Characteristics Electrical Characteristics Supply Voltage Supply Current Supply Zener Voltage Reverse Battery Current Power-On Time 3 Power-On State Chopping Frequency Output Stage Characteristics Output Saturation Voltage Output ...

Page 4

A1225, A1227 Hall Effect Latch for High Temperature Operation A1229 and may require derating at maximum conditions, see application information THERMAL CHARACTERISTICS Characteristic Package Thermal Resistance *Additional thermal information available on Allegro website. 1900 1800 1700 1600 1500 1400 1300 ...

Page 5

A1225, A1227 Hall Effect Latch for High Temperature Operation A1229 and 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 6

A1225, A1227 Hall Effect Latch for High Temperature Operation A1229 and Operate Point versus Ambient Temperature 300 280 260 240 220 200 180 160 140 - 100 120 140 160 ...

Page 7

A1225, A1227 Hall Effect Latch for High Temperature Operation A1229 and Operate Point versus Ambient Temperature 175 163 150 138 125 113 100 100 120 ...

Page 8

A1225, A1227 Hall Effect Latch for High Temperature Operation A1229 and Operate Point versus Ambient Temperature 200 190 180 170 160 150 140 130 120 110 100 ...

Page 9

A1225, A1227 Hall Effect Latch for High Temperature Operation A1229 and Functional Description and Application Information Switching Behavior The output of the A1225, A1227, and A1229 devices switches low (turns on) when a magnetic field perpendicular to the Hall element ...

Page 10

A1225, A1227 Hall Effect Latch for High Temperature Operation A1229 and 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 relative ...

Page 11

A1225, A1227 Hall Effect Latch for High Temperature Operation A1229 and +0.13 4.47 –0.08 1.73 ±0.10 E 2.24 B +0.03 2.57 +0.10 –0.28 4.14 –0. 10° REF +0.05 0.43 –0.07 0.51 2X 1.50 NOM Package LT 3-Pin ...

Page 12

A1225, A1227 Hall Effect Latch for High Temperature Operation A1229 and 45° +0.08 3.02 –0.05 2.16 MAX 0.51 REF 15.75 ±0.51 +0.05 0.43 –0.07 Copyright ©2009-2010, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of ...

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