Micronas HAL 817 Programmable Linear Hall-Effect Sensor Product Information

Short description

The HAL 817 is a member of Micronas family of programmable linear Hall sensors HAL 8xy. The device replaces the HAL 815 and is hence fully compatible.

The HAL 817 is a universal magnetic field sensor with a linear analog output. The IC can be used for angular and linear measurements if combined with a rotating or moving magnet. Major characteristics like magnetic field range, sensitivity, VOQ (output voltage at zero magnetic field), and the temperature coefficients can easily be adjusted to the magnetic circuit (linear and quadratic terms) by programming the non-volatile memory.

The easy programmability allows a 2-point calibration by adjusting the output signal directly to the input signal (such as 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.

The calculation of the individual sensor characteristics and the programming of the non-volatile memory can easily be done with a PC and the application kit from Micronas.

The sensor is designed to be used in automotive and industrial applications.

The HAL 817 is available in the very small leaded package TO-92UT.

Block diagram

System Architecture

The HAL 817 sensors are produced in a proven automotive technology.

The HAL 817 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 817 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 817

Features

Main Features

Sensitivity drift over temperature less than ±400 ppm/K
Offset drift over temperature less than ±10 µT/K
Integral non-linearity error of output signal ±0.5% of VDD
Ratiometric error of output signal ±0.5%
Low output noise of 6 mV RMS
Wire break detection
Programmable magnetic ranges between ±30 and ±150 mT
Five programmable 3 dB filter frequencies
Programmable sensitivity, offset (VOQ) and clamping
12-bit ratiometric analog output
Digital signal processing
Temperature characteristics program-mable to match all common magnetic materials
Programming by modulation of the supply voltage
Operates with static magnetic fields and dynamic magnetic fields up to 2 kHz
Short-circuit protected push-pull output
Overvoltage and reverse-voltage protection at all pins
Operates from –40 °C up to 170 °C junction 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, the HAL 817 is the optimal system solution for applications such as

Contactless potentiometers
Rotary position measurement
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

Please regard the Micronas “Terms of Use” and the section “Copyright, Waranty, and Limitation of Liability” in the technical product documentation.