MICRONAS HAL82X_1

PRODUCT INFORMATION
HAL 82x
April/2007
HAL® 82x
High-Precision Programmable Hall-Effect Sensors
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.
Features
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52 customer data bits
Programming by modulation of the
supply voltage
Operates from –40 °C up to 150 °C
ambient temperature
Sensitivity drift over temperature less
than ±1% (HAL 825 less than ±2%)
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Offset drift over temperature less than
±0.2% (HAL 825 less than ±0.3%) of
VDD
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DNL of analog output ±0.9 LSB
(±2 LSB for HAL 825)
Major Applications
Wire Break Detection with 5 kΩ pull-up
or pull-down resistor
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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 programmable to match all common magnetic
materials
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Operates from 4.5 V up to 5.5 V supply
voltage
Magnetic characteristics extremely
robust against mechanical stress
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
PRODUCT INFORMATION
HAL 82x
April/2007
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:
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Serial Port
Micronas programmer board
(hardware version 5.x)
Visual Basic® programming software for
Windows® 9x/2000/XP
HAL Programmer Board
Visual Basic source code
Fig. 1: Development tool setup
System Architecture
The HAL 82x sensors are produced in a
proven automotive submicron CMOS technology.
VDD
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.
Internally
stabilized
Supply and
Protection
Devices
Temperature
Dependent
Bias
Oscillator
Switched
Hall Plate
A/D
Converter
Digital
Signal
Processing
Open-circuit,
Overvoltage,
Undervoltage
Detection
D/A
Converter
50
Protection
Devices
50
Analog
Output
OUT
EEPROM Memory
Supply
Level
Detection
Digital
Output
OpenCircuit
Detection
Lock Control
GND
Fig. 2: Block diagram of the HAL 82x
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 April 16, 2007; Order No. PI000021_002EN
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