Description

The Allegro™ A1366 factory-programmable linear Hall-

effect current sensor IC has been designed to achieve high

accuracy and resolution. The goal is achieved through new

proprietary linearly interpolated temperature compensation

technology that is programmed at the Allegro factory, which

provides sensitivity and offset that are virtually flat across

the full operating temperature range. The flat performance

over temperature makes this IC ideally suited for current

sensing applications. Temperature compensation is done in

the digital domain with integrated EEPROM technology

without sacrificing the analog signal path bandwidth, making

this device ideal for HEV inverter, DC-to-DC converter, and

electric power steering (EPS) applications.

ThisratiometricHall-effectsensorICprovidesavoltageoutput

thatisproportionaltotheappliedmagneticfield.Sensitivityand

quiescent (zero field) output voltage are factory programmed

with high resolution which provides for an accuracy of less

than ±1%, typical, over temperature.

ThesensorICincorporatesahighlysensitiveHallelementwith

aBiCMOSinterfaceintegratedcircuitthatemploysalownoise,

small-signal high-gain amplifier, as well as a low-impedance

output stage, and a proprietary, high bandwidth dynamic offset

A1366-DS

Features and Benefits

•

Factory programmed sensitivity and quiescent output

voltage with high resolution

•

Proprietary segmented linear interpolated temperature

compensation (TC) technology provides a typical accu-

racy of 1% across the full operating temperature range

•

Extremely low noise and high resolution achieved

via proprietary Hall element and low noise amplifier

circuits

•

120 kHz nominal bandwidth achieved via proprietary

packaging and chopper stabilization techniques

•

Patented circuits suppress IC output spiking during fast

current step inputs

•

Open circuit detection on ground pin (broken wire)

•

Low Noise, High Precision, Factory-Programmed Linear Hall Effect Sensor IC

With Advanced Temperature Compensation and High Bandwidth (120 kHz) Analog Output

Package: 4-pin SIP (suffix KT)

Functional Block Diagram

Not to scale

A1366

1 mm case thickness

V+

EEPROM and

Control Logic

VCC

GND

VOUT

Signal Recovery

To all subcircuits

Temperature

Sensor

Offset Control

Sensitivity Control

Programming

Control

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