PRODUCT INFORMATION HAL 85x Oct/2002 HAL 85x Programmable Hall-Effect Sensors with Arbitrary Output The HAL 85x complement the existing Halleffect sensor family HAL 8xx. Both universal magnetic field sensors provide an arbitrary output signal. The sensors are produced in submicron CMOS technology. In combination with a rotating or moving magnet, the sensors can be employed for angle, distance, and level measurements. The sensors provide either a pulse width modulated (PWM) output signal or a serial Biphase-M output. Features ◆ Operates from 4.5 V up to 18 V supply voltage ◆ High-precision linear Hall effect sensors with different output formats ◆ Operates with static magnetic fields and dynamic magnetic fields up to 2 kHz ◆ Various programmable magnetic characteristics with non-volatile memory ◆ Choppered offset compensation ◆ Programmable output characteristic (32 setpoints with 9 bit resolution) ◆ Overvoltage protection on all pins ◆ Reverse-voltage protection on VDD pins ◆ Programmable output formats (PWM or serial Biphase-M) ◆ Magnetic characteristics extremely robust against mechanical stress ◆ Programmable PWM Period ◆ Short-circuit protected output Major characteristics like magnetic field range, output characteristic, output format, sensitivity, shift (duty cycle of the PWM output signal or the serial output word), PWM period, low and high current, and the temperature coefficients can easily be adjusted to the magnetic circuit (linear and quadratic) by programming the non-volatile memory. The output characteristic can be set with 32 setpoints with a resolution of 9 bit ◆ Open-drain output for HAL 855 ◆ EMC-optimized design ◆ Programmable output current source for HAL 856 (low and high current) Major Applications ◆ Programming by modulation of the supply voltage ◆ Contactless potentiometers The sensors were designed to translate a linear magnetic field into an arbitrary output signal or a non-linear magnetic field into a linear output signal. The sensors are available in the very small leaded package TO-92UT. ◆ Lock function and built-in redundancy for EEPROM memory ◆ Level measurement ◆ Operates from –40 °C up to 150 °C ambient temperature ◆ Magnetic field detection ◆ Digital signal processing ◆ Temperature characteristics programmable for matching all common magnetic materials Due to the sensor’s versatile programming characteristics, the HAL 85x is the optimal system solution for applications such as: ◆ Rotary position measurement ◆ Linear position detection PRODUCT INFORMATION HAL 85x Oct/2002 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: Serial Port ◆ Micronas programmer board (hardware version 5.x) ◆ Visual Basic programming software for Windows 9x/2000/NT/ME HAL Programmer Board ◆ Visual Basic source code Fig. 1: Development tool setup System Architecture The HAL 85x sensors are produced in a proven automotive submicron CMOS technology. VDD The HAL 85x features a temperature-compensated Hall plate with choppered offset compensation, an A/D converter, digital signal processing, an open-drain output or output current source, an EEPROM memory with redundancy and lock function for the calibration data and the output characteristic, a serial interface for programming the EEPROM, and protection devices on all pins Bandgap Reference The HAL 85x is programmable by modulating the supply voltage. No additional programming pin is needed. Temperature Dependent Bias Switched Hall Plate A/D Converter Supply Level Detection Lock Control Oscillator Digital Signal Processing Open-Drain Output OUT EEPROM Memory GND The internal digital signal processing is a great benefit because analog offsets, temperature shifts, and mechanical stress do not degrade the sensor accuracy. Fig. 2: Block diagram of the HAL 855 All information and data contained in this product information are without any commitment, are not to be considered as an offer for conclusion of a contract, nor shall they be construed as to create any liability. Product or development sample availability and delivery are exclusively subject to our respective order confirmation form. By this publication, Micronas GmbH does not assume responsibility for patent infringements or other rights of third parties which may result from its use. No part of this publication may be reproduced, photocopied, stored on a retrieval system, or transmitted without the express written consent of Micronas GmbH. Edition Oct. 1, 2002; Order No. 6251-604-1PI Micronas GmbH ⋅ Hans-Bunte-Strasse 19 ⋅ D-79108 Freiburg (Germany) ⋅ P.O. Box 840 ⋅ D-79008 Freiburg (Germany) Tel. +49-761-517-0 ⋅ Fax +49-761-517-2174 ⋅ E-mail: [email protected] ⋅ www.micronas.com