Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC

with Regulated Supply, Advanced Temperature Compensation,

and High-Bandwidth (240 kHz) Analog Output

A1367

2

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

The sensor IC incorporates a highly sensitive Hall element with

a BiCMOS interface integrated circuit that employs a low-noise

small-signal high-gain amplifier, a clamped low-impedance output

stage,andaproprietary,high-bandwidthdynamicoffsetcancellation

technique. These advances in Hall-effect technology work together

to provide an industry-leading sensing resolution at the full 240 kHz

bandwidth. Broken ground wire detection as well as user-selectable

outputvoltageclampsalsoarebuiltintothisdeviceforhighreliability

in automotive applications.

Device parameters are specified across an extended ambient

temperaturerange:–40°Cto150°C.TheA1367sensorICisprovided

in an extremely thin case (1 mm thick), 4-pin SIP (single in-line

package, suffix KT) that is lead (Pb) free, with 100% matte-tin

leadframe plating.

• Patented circuits suppress IC output spiking during fast current

step inputs

• Open circuit detection on ground pin (broken wire)

• Selectable sensitivity range between 0.6 and 6.4 mV/G

through use of coarse sensitivity program bits

• User-selectable ratiometric behavior of sensitivity, quiescent

voltage, and clamps (ratiometry can be disabled), for simple

interface with application A-to-D converter (ADC)

• Precise recoverability after temperature cycling

• Output voltage clamps provide short-circuit diagnostic

capabilities

• Wide ambient temperature range: –40°C to 150°C

• Immune to mechanical stress

• Extremely thin package: 1 mm case thickness

• AEC-Q100 automotive qualified

FEATURES AND BENEFITS (CONTINUED)

Selection Guide

Part Number

Package

(mV/G)

A1367LKTTN-1-T

4-pin SIP

4000 pieces per 13-in. reel

SENS_COARSE 00: 0.6 to 1.3

A1367LKTTN-2-T

4-pin SIP

4000 pieces per 13-in. reel

SENS_COARSE 01: 1.3 to 2.9

A1367LKTTN-2U-T

4-pin SIP

4000 pieces per 13-in. reel

SENS_COARSE 01: 1.3 to 2.9

A1367LKTTN-5-T

4-pin SIP

4000 pieces per 13-in. reel

SENS_COARSE 10: 2.9 to 6.4

1

Contact Allegro for additional packing options

2

Allegro recommends against changing Coarse Sensitivity settings when programming devices that will be used in production. Each A1367

has been factory temperature compensated at a specific sensitivity range, and changing the coarse bits setting could cause sensitivity drift

DESCRIPTION (CONTINUED)

Specifications

3

Absolute Maximum Ratings

3

Thermal Characteristics

3

Pinout Diagram and Terminal List Table

4

Operating Characteristics

5

Characteristic Performance Data

8

Characteristic Definitions

11

Functional Description

16

Programming Sensitivity and Quiescent

Voltage Output

16

Coarse Sensitivity

16

Memory-Locking Mechanisms

16

Power-On Reset (POR) Operation

17

Detecting Broken Ground Wire

18

Chopper Stabilization Technique

19

Programming Guidelines

20

Serial Communication

20

Writing Access Code

22

Writing to Volatile Memory

22

Writing to Nonvolatile Memory

22

Reading from EEPROM or Volatile Memory

22

Enabling/Disabling Ratiometry

24

EEPROM Cell Organization

24

Diagnostic Clamps

25

EEPROM Error Checking and Correction (ECC)

25

Detecting ECC Error

25

Package Outline Drawing

26

Table of Contents