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 ful-
fill high requirements in respect of low tem-
perature drifts of sensitivity and offset.
Due to the very low drifts of this sensor fam-
ily, it can be used for applications with very
high requirements on offset and sensitivity
drift stability. This is mandatory for applica-
tions like throttle position detection, acceler-
ator pedal sensing, or current measure-
ment.
The sensors provide either a ratiometric
analog output signal or a multiplexed ana-
log 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 accu-
racy.
Major characteristics like magnetic field
range, output format, sensitivity, VOQ (out-
put 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.
V
V
V
V
V
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
Features
V
V
V
V
V
V
V
V
V
V
V
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 frequen-
cies: 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
Major Applications
V
V
V
V
V
Due to the sensor’s versatile program-
ming characteristics and low drifts, the
HAL 82x is the optimal system solution
for applications such as:
Contactless potentiometers
Rotary position measurement, like throt-
tle position or accelerator pedal
Linear movement
Current measurements