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

With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator

A1365

2

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

the range of 0.6 to 14 mV/G.

The A1365 incorporates a highly sensitive Hall element with a

BiCMOS interface integrated circuit that employs temperature-

compensation circuitry to reduce the intrinsic sensitivity and offset

driftoftheHallelement.TheICalsoincludesasmall-signalhigh-gain

amplifier, a clamped low-impedance output stage, and a proprietary

high-bandwidth dynamic offset cancellation technique.

Devicespecificationsapplyacrossanextendedambienttemperature

range: –40°C to 150°C. The A1365 sensor IC is provided in an

extremely thin case (1 mm thick), 4-pin SIP (single inline package,

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

plating.Thethinpackageallowsforbettermagneticcouplingbecause

the smaller the air gap in the core is, the higher the coupling from

current to magnetic field will be.

• Selectable sensitivity range between 0.6 and 14 mV/G through

use of coarse sensitivity program bits

• Ratiometric sensitivity, quiescent voltage output, and

clamps enable simple interface with application A-to-D

converter (ADC)

• Output voltage clamps provide short-circuit diagnostic

capabilities

• Open-circuit detection on ground pin (broken wire)

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

FEATURES AND BENEFITS (CONTINUED)

Selection Guide

Part Number

Package

(mV/G)

A1365LKTTN-1-T

4-pin SIP

4000 pieces per 13-in. reel

0.6 to 1.3

A1365LKTTN-2-T

4-pin SIP

4000 pieces per 13-in. reel

1.3 to 2.9

A1365LKTTN-5-T

4-pin SIP

4000 pieces per 13-in. reel

2.9 to 6.4

A1365LKTTN-10-T

4-pin SIP

4000 pieces per 13-in. reel

6.4 to 14

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 A1365 has been factory temperature compensated at a specific sensitivity range, and changing the coarse bits setting could

DESCRIPTION (CONTINUED)

Specifications

3

Absolute Maximum Ratings

3

Thermal Characteristics

3

Pinout Diagram and Terminal List Table

4

Operating Characteristics

5

Characteristic Performance Data

9

Characteristic Definitions

13

Functional Description

19

Programming Sensitivity and Quiescent

Voltage Output

19

Coarse Sensitivity

19

Memory-Locking Mechanisms

19

Power-On Reset (POR) and Undervoltage

Lockout (UVLO) Operation

20

Detecting Broken Ground Wire

21

Over Magnet Field Fault

22

Programming Serial Interface

24

Transaction Types

24

Writing the Access Code

24

Writing to Volatile Memory

24

Writing to EEPROM

25

Reading from EEPROM or Volatile Memory

25

Error Checking

25

Serial Interface Reference

26

Serial Interface Message Structure

27

VCC Levels During Manchester Communication

27

Shadow Mode

28

EEPROM Margining

29

EEPROM Cell Organization

30

EEPROM Error Checking and Correction (ECC)

30

Detecting ECC Error

30

Package Outline Drawing

31

Table of Contents