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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.


 
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