Micronas HAL 82x High-Precision Programmable Hall-Effect Sensors Product Information

Short description

The HAL 824 and the HAL 825 complement the existing Hall-effect sensor family HAL 8xy. Both high-precision magnetic field sensors provide a ratiometric, linear output signal. This sensor family is designed to fulfill high requirements in respect of low temperature drifts of sensitivity and offset.

Due to the very low drifts of this sensor family, it can be used for applications with very high requirements on offset and sensitivity drift stability. This is mandatory for applications like throttle position detection, accelerator pedal sensing, or current measurement.

The sensors provide either a ratiometric analog output signal or a multiplexed analog output. In multiplex analog output mode, the sensor transmits LSN and MSN of the output value separately. This enables the sensor to transmit a signal with 14-bit accuracy.

Major characteristics like magnetic field range, output format, sensitivity, VOQ (output voltage at zero magnetic field), and the temperature coefficients can easily be adjusted to the magnetic circuit (linear and quadratic) by programming the non-volatile memory.

Both sensors are available in the very small leaded package TO-92UT.

Block diagram

System Architecture

The HAL 82x sensors are produced in a proven automotive submicron CMOS technology.The HAL 82x features a temperature-compensated Hall plate with choppered offset compensation, an A/D converter, digital signal processing, a push-pull output, an EEPROM memory with redundancy and lock function for the calibration data and the data register information, a serial interface for programming the EEPROM, and protection devices on all pins.The HAL 82x is programmable by modulating the supply voltage. No additional programming pin is needed.The internal digital signal processing is a great benefit because analog offsets, temperature shifts, and mechanical stress do not degrade the sensor accuracy.

Block diagram of the HAL 82x

Features

Main Features

Sensitivity drift over temperature less than ±1% (HAL 825 less than ±2%)
Offset drift over temperature less than ±0.2% (HAL 825 less than ±0.3%) of VDD
DNL of analog output ±0.9 LSB (±2 LSB for HAL 825)
Wire Break Detection with 5 kΩ pull-up or pull-down resistor
Four programmable magnetic ranges: ±30, ±60, ±80, and ±100 mT
Two programmable 3 dB filter frequencies: 500 Hz and 1 kHz
Programmable sensitivity and offset (VOQ)
12-bit ratiometric analog output
14-bit signal path
Digital signal processing
Temperature characteristics program-mable to match all common magnetic materials
52 customer data bits
Programming by modulation of the supply voltage
Operates from –40 °C up to 150 °C ambient temperature
Operates from 4.5 V up to 5.5 V supply voltage
Magnetic characteristics extremely robust against mechanical stress

Major Applications

Due to the sensor’s versatile programming characteristics and low drifts, the HAL 82x is the optimal system solution for applications such as:
Contactless potentiometers
Rotary position measurement, like throttle position or accelerator pedal
Linear movement
Current measurements

Tools

Development Tools

Programming of the EEPROM memory and calculation of the individual sensor characteristics can easily be done with a PC and the application kit from Micronas:

Micronas programmer board (hardware version 5.x)
Visual Basic^® programming software for Windows^® 9x/2000/XP
Visual Basic source code

Development tool setup

Selection Guide and Online Ordering

Product type
Product name
Properties
Programmable	Range [mT]	Output Format
Appliction	Supply Voltage Range [V]	Special Features
Temperature Range	Package

Product

Package

Temp. Range

Order Code

Ordering

HAL 824

TO-92UT

-40°C - 140°C

HAL 824UT-K

HAL 824

TO-92UT

-40°C - 170°C

HAL 824UT-A

HAL 825

TO-92UT

-40°C - 170°C

HAL 825UT-A

HAL 825

TO-92UT

-40°C - 140°C

HAL 825UT-K