Date: 7th Jun 2011
2D Hall type position sensor for measuring
long distances in automotive and industrial apps
Micronas is offering new Hall sensor HAL 3855, a 2D position
sensor. If an axially magnetized magnet is moved parallel
to the surface of the sensor housing, the sensor detects
every change in the magnetic field components By and Bz.
The internal digital signal processing of the HAL 3855 puts
the measured values in relation to each other and so delivers
the displacement information at the output side by way of
an analog signal.
HAL 3855 can linearize the output signal using 32 support
points with 16 bit resolution. The sensor has a high-temperature
capable EEPROM which operates within a temperature range
of -40 to +170°C.
The HAL 3855 features diagnosis functions such as over-
and under-voltage detection, and it is capable of detecting
a break in the supply lines or the loss of the magnet. Thermal
monitoring at the output protects the sensor from overload.
The HAL 3855 is particularly suitable for applications
in the automobile and the industrial market where longer
distances are to be measured in confined construction spaces,
for instance as clutch travel sensor to detect the traveling
range of the clutch. Other potential applications for the
HAL 3855 include exhaust gas recirculation systems (where
the sensor determines the valve position) or determining
the position of the gear selector.
|