HAL82x
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.
DATA SHEET
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
MICRONAS [ MICRONAS ]
