PRODUCT INFORMATION
HAL 2850
May/2008
®
HAL 2850
Linear Hall-Effect Sensor with PWM Output
The HAL 2850 is a new member of the
Micronas varioHAL (HAL 28xy) family of
programmable linear Hall-effect sensors.
It features a digital PWM output with slew-
rate control, that enables a fast and robust
data transfer in harsh environments. The
PWM signal can be directly decoded by any
unit measuring a duty cycle of a rectangular
signal (usually a timer/capture unit in a
microcontroller).
The highest available PWM frequency is
2 kHz with 12-bit resolution. The PWM fre-
quency is customer-programmable in a
range between 30 Hz and 2 kHz, with a cer-
tain resolution. The open-drain output with
programmable slew rates enables an excel-
lent EMI performance of the total system.
The HAL 2850 features a Hall-plate with
spinning current offset compensation tech-
nique and a precise temperature sensor
which is used for temperature compensa-
tion of both the Hall-sensors sensitivity and
offset.
The sensor provides digital signal process-
ing. This is of great benefit because analog
offsets, temperature shifts, and mechanical
stress do not degrade digital signals.
Major characteristics, such as magnetic
field range, sensitivity, offset, output polarity,
clamping levels, PWM frequency, and the
temperature coefficients of sensitivity and
offset, can easily be adjusted to the mag-
netic circuit by programming the non-vola-
tile memory.
The HAL 2850 is available in the very small
leaded package TO-92UT.
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Sample accurate transmission
(each PWM period transmits a new Hall
sample)
Programmable PWM frequency in a
range between 30 Hz and 2 kHz
Non-volatile EEPROM with redundancy
and lock function
Open-drain output with slew-rate control
Individual serial number for each sensor
12-bit customer serial number
Features
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High-precision linear Hall-effect sensor
Spinning-current offset compensation
Built-in temperature sensor
On-board diagnostics (over temperature,
over current, etc.)
Customer-programmable temperature
compensation of output sensitivity
(2
nd
order) and output offset (1
st
order)
Operating junction temperature range:
−40
°C…170 °C.
Magnetic characteristics are extremely
robust against mechanical stress.
Digital signal processing
12-bit resolution
Sampling rate up to 2 kHz with internal
low-pass filter
Major Applications
Due to the sensor’s versatile programming
characteristics and low drifts, the HAL 2850
is the optimal system solution for applica-
tions such as:
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Contactless potentiometers
Angular measurements
(e.g. valve, pedal position)
Linear movement
(e.g. seat track position)
Linear force or torque measurements
Current sensing
(e.g. battery management)
Leveling
(e.g. fuel level, suspension control or
headlight leveling)
MICRONAS [ MICRONAS ]
