HAL824 View Datasheet(PDF) - Micronas

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HAL824

High-Precision Programmable Linear Hall-Effect Sensor

Micronas 

HAL 82x

DATA SHEET

High-Precision Programmable Linear Hall-Effect

Sensor Family

Release Note: Revision bars indicate significant

changes to the previous edition.

1. Introduction

The HAL82x is a new member of the Micronas family

of programmable linear Hall sensors. As an extension

to the HAL 8x5, it offers an improved temperature per-

formance, enhanced wiring failure detection and a 14-

bit multiplexed analog data output. It is possible to pro-

gram different sensors which are in parallel to the

same supply voltage individually.

The HAL82x 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 HAL82x 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 HAL82x 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 sig-

nal (like mechanical angle, distance, or current). Indi-

vidual adjustment of each sensor during the cus-

tomer’s manufacturing process is possible. With this

calibration procedure, the tolerances of the sensor, the

magnet, and the mechanical positioning can be com-

pensated 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. This enables oper-

ation over the full temperature range with high

accuracy.

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 150 °C. The HAL 82x 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 HAL82x is the

optimal system solution for applications such as:

– contactless potentiometers,

– angle sensors (like throttle position, paddle position

and EGR applications),

– distance measurements,

– magnetic field and current measurement.

1.2. Features

– high-precision linear Hall effect sensor with ratio-

metric output and digital signal processing

– Low output voltage drifts over temperature

– 12-bit analog output and 14-bit multiplex 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 5 kΩ pull-up and pull-down resistor, over-

voltage 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 150 °C ambient 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

4

Feb. 3, 2009; DSH000143_003EN

Micronas

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