A1421LK-T Allegro Microsystems Inc, A1421LK-T Datasheet

IC,HALL-EFFECT SENSOR,SINGLE-ENDED,SIP,4PIN,PLASTIC

A1421LK-T

Manufacturer Part Number

A1421LK-T

Description

IC,HALL-EFFECT SENSOR,SINGLE-ENDED,SIP,4PIN,PLASTIC

Manufacturer

Allegro Microsystems Inc

Type

Special Purposer

Datasheet

1.A1421LK-T.pdf (15 pages)

Specifications of A1421LK-T

Rohs Compliant

YES

Sensing Range

27.5G Trip, -12.5G Release

Voltage - Supply

4 V ~ 26.5 V

Current - Supply

7mA

Current - Output (max)

25mA

Output Type

Digital, Open Collector

Features

High Precision

Operating Temperature

-40°C ~ 150°C

Package / Case

4-SIP

Magnetic Type

Monolithic

Operating Supply Voltage (min)

Operating Supply Voltage (typ)

12V

Operating Supply Voltage (max)

26.5V

Output Current

25mA

Mag Sensor Operate Point (g)

27.5Gs

Mag Sensor Release Point (g)

-12.5Gs

Mag Sensor Hysteresis(g)

15Gs

Package Type

SIP

Pin Count

Mounting

Through Hole

Operating Temp Range

-40C to 150C

Operating Temperature Classification

Automotive

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

• Integrated tracking capacitor

• Used for sensing motion of ring magnet or ferrous targets

• Wide operating temperature range

• Operation with magnetic input signal frequency from

• EMI/ESD-resistant

• Large effective air gaps

• 4.0 to 26.5 V supply operating range

• Output compatible with CMOS logic families

• Reverse battery protection

• Resistant to mechanical and thermal stress

• Accurate true zero crossing switchpoint (A1421 only)

• High vibration immunity, in running mode (A1423 only)

Package: 4 pin SIP (suffix K)

Not to scale

A1421a-DS, Rev. 4

20 Hz to 30 kHz

High Precision Hall Effect AC-Coupled Differential Sensor IC

(Pin 1)

0.1 uF

VCC

Transducers

Dual Hall

Amp

Hall

Regulator

Functional Block Diagram

Stage

Gain

Bandpass Filter Integrated

Tracking Capacitor

with Integrated Filter Capacitor

Description

The A1421, A1422, and A1423 are AC-coupled Hall-effect

sensor ICs which include monolithic integrated circuits that

switch in response to changing differential magnetic fields

created by rotating ring magnets or, when coupled with a

magnet, by ferrous targets. This family of devices also includes

an integrated capacitor that provides the high accuracy of analog

sensing without an external filter capacitor. This reduces cost

and components, while improving the reliability of the final

sensor solution.

Magnetic field changes affect the two integrated Hall

transducers and then are differentially amplified on the chip.

Differential design provides immunity to radial vibration,

within the device operating air gap range, by rejection of this

common-mode signal change. Steady-state system offsets

are eliminated using an on-chip differential bandpass filter

with integrated capacitor. This filter also provides relative

immunity to interference from electromagnetic sources. The

device utilizes advanced temperature compensation for the

high-pass filter, sensitivity, and Schmitt trigger switchpoints

to guarantee optimal operation to low frequencies over a wide

range of air gaps and temperatures.

Continued on the next page…

REF

A1421, A1422,

Comparator

Diagnostic

Circuitry

GND

(Pin 4)

and

(Required)

TEST

(Pin 3)

VOUT

(Pin 2)

A1423

Related parts for A1421LK-T

A1421LK-T Summary of contents

Page 1

High Precision Hall Effect AC-Coupled Differential Sensor IC Features and Benefits • Integrated tracking capacitor • Used for sensing motion of ring magnet or ferrous targets • Wide operating temperature range • Operation with magnetic input signal frequency from 20 ...

Page 2

... CMOS logic circuits. Product Selection Guide Output Switching DIFF Part Number B Diff Increasing Decreasing Low (On) to High (Off) to A1421LK-T High (Off) Low (On) High (Off) to Low (On) to A1422LK-T Low (On) High (Off) High (Off) to Low (On) to A1423LK-T Low (On) High (Off) * Contact Allegro for additional packing options ...

Page 3

A1421, A1422, A1423 and Description (continued) further from the zero-crossing. The output polarities are shown in the Product Selection Guide table. This variety of options provides flexibility for achieving solu- tions for a wide range of applications, including automotive transmission ...

Page 4

A1421, A1422, A1423 and OPERATING CHARACTERISTICS, continued within operating range, unless otherwise noted. Typical operating parameters: V Characteristic Symbol 5,6 MAGNETIC CHARACTERISTICS Operate Point B OP Release Point B RP Hysteresis B HYS Applied Magnetic Field 7 B diff 1 ...

Page 5

A1421, A1422, A1423 and may require derating at maximum conditions, see application information THERMAL CHARACTERISTICS Characteristic Package Thermal Resistance *In still air. Additional thermal information available on Allegro Web site. Power Derating Curve T = 165°C; I J(max ...

Page 6

A1421, A1422, A1423 and I CC(OFF) Over V CC 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 – Ambient Temperature CC(ON) Over V CC 10.0 9.0 8.0 7.0 6.0 5.0 4.0 ...

Page 7

A1421, A1422, A1423 and Continued on next page. High Precision Hall Effect AC-Coupled Differential Sensor IC with Integrated Filter Capacitor Simulation Results 7 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com ...

Page 8

A1421, A1422, A1423 and Continued on next page. High Precision Hall Effect AC-Coupled Differential Sensor IC with Integrated Filter Capacitor Simulation Results, continued 8 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com ...

Page 9

A1421, A1422, A1423 and Continued on next page. High Precision Hall Effect AC-Coupled Differential Sensor IC with Integrated Filter Capacitor Simulation Results, continued 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com ...

Page 10

A1421, A1422, A1423 and High Precision Hall Effect AC-Coupled Differential Sensor IC with Integrated Filter Capacitor Simulation Results, continued 10 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com ...

Page 11

A1421, A1422, A1423 and Please contact Allegro MicroSystems for EMC performance information. ESD – Human Body Model ESD – Machine Model Conducted Transients Direct RF Injection Bulk Current Injection TEM Cell * ESD test is done with no external components. ...

Page 12

A1421, A1422, A1423 and The A1421, A1422, and A1423 are versatile high-precision dif- ferential sensor ICs that can be used in a wide range of applica- tions. Proper choice of the target material and shape, magnet material and shape, and ...

Page 13

A1421, A1422, A1423 and in the Characteristic Data section quantify the effect of the input signal amplitude on the phase shift of the output. Positive values of delay indicate a lagging output, while negative values indicate a leading output. AC-Coupled ...

Page 14

A1421, A1422, A1423 and 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 sup- plied power or improving the heat ...

Page 15

A1421, A1422, A1423 and 45° +0.08 3.43 –0.05 E1 2.16 MAX 1 14.73 ±0.51 +0.07 0.41 –0.05 Copyright ©2004-2009, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; ...

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