HAL880 datasheet(4/34 Pages) MICRONAS

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HAL880

DATA SHEET

Feb. 23, 2009; DSH000152_001EN

Micronas

Programmable Linear Hall-Effect Sensor

1. Introduction

The HAL880 is a new member of the Micronas family

of programmable linear Hall sensors. The HAL880

complements the existing Hall-effect sensor family

HAL8xy to the lower end. It is designed to fulfill the

requirements of today’s state-of-the-art applications for

linear and angular measurements that require pro-

grammability to compensate system tolerances.

The HAL880 is an universal magnetic field sensor with

a linear output based on the Hall effect. The IC can be

used for angle or distance measurements if combined

with a rotating or moving magnet. The major charac-

teristics like magnetic field range, sensitivity, output

quiescent voltage (output voltage at B = 0 mT), and

output voltage range are programmable in a non-vola-

tile memory. The sensor has a ratiometric output char-

acteristic, which means that the output voltage is pro-

portional to the magnetic flux and the supply voltage.

The HAL 880 features a temperature-compensated

Hall plate with choppered offset compensation, an A/D

converter, digital signal processing, a D/A converter

with output driver, an EEPROM memory with redun-

dancy and lock function for the calibration data, an

EEPROM for customer serial number, a serial inter-

face for programming the EEPROM, and protection

devices at all pins. The internal digital signal process-

ing is of great benefit because analog offsets, temper-

ature shifts, and mechanical stress do not degrade the

sensor accuracy.

The HAL880 is programmable by modulating the sup-

ply voltage. No additional programming pin is needed.

The easy programmability allows a 2-point calibration

by adjusting the output voltage directly to the input

signal (like mechanical angle, distance, or current).

Individual adjustment of each sensor during the

customer’s manufacturing process is possible. With

this calibration procedure, the tolerances of the sensor,

the magnet, and the mechanical positioning can be

compensated in the final assembly. This offers a low-

cost alternative for all applications that presently need

mechanical adjustment or laser trimming for calibrating

the system.

In addition, the temperature compensation of the Hall

IC can be fit to common magnetic materials by pro-

gramming first and second order temperature coeffi-

cients of the Hall sensor sensitivity.

The calculation of the individual sensor characteristics

and the programming of the EEPROM memory can

easily be done with a PC and the application kit from

Micronas.

The sensor is designed for hostile industrial and

automotive applications and operates with typically

5 V supply voltage in the ambient temperature range

from

−40 °C up to 125 °C. The HAL880 is available

in the very small leaded packages TO92UT-1 and

TO92UT-2.

1.1. Major Applications

Due to the sensor’s versatile programming character-

istics and low temperature drifts, the HAL 880 is the

optimal system solution for applications such as:

– contactless potentiometer,

– rotary position measurement,

– linear movement,

– current measurements.

1.2. Features

– programmable linear Hall effect sensor with ratio-

metric output and digital signal processing

– 12-bit analog output

– multiple programmable magnetic characteristics in a

non-volatile memory (EEPROM) with redundancy

and lock function

– open-circuit (ground and supply line break detec-

tion) with 10 k

Ω pull-up and pull-down resistor,

overvoltage and undervoltage detection

– for programming an individual sensor within several

sensors in parallel to the same supply voltage, a

selection can be done via the output pin

– temperature characteristics are programmable for

matching common magnetic materials

– programmable clamping function

– programming through a modulation of the supply

voltage

– operates from

−40 °C up to 140 °C junction temper-

ature

– operates from 4.5 V up to 5.5 V supply voltage in

specification and functions up to 8.5 V

– operates with static magnetic fields and dynamic

magnetic fields up to 1 kHz

– overvoltage and reverse-voltage protection at all

pins

– magnetic characteristics extremely robust against

mechanical stress

– short-circuit protected push-pull output

– EMC and ESD optimized design

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