Programmable Hall sensors

Programmable Hall sensors are developed from digital Hall sensors. With these sensors, the output signal can be freely programmed depending on the position of the magnet. In many Hall sensor applications, one is confronted with the problem that the measuring accuracy (precision of the switching points) is strongly reduced by geometric tolerances, magnetic material tolerances and temperature drift. The basic idea of programmable sensors is that the sensors are programmed in the application, so that the above mentioned tolerances can be compensated.

In the case of the HAL 80x series, two positions of the magnet (in the case of position sensing, usually the start and end position) can be entered and the output voltage required can be programmed at these points. The sensor performs linear interpolation of the output voltage for the intermediate positions of the magnet. Programming is performed by modulating the operating voltage.

The HAL 85x series is an extension of this concept, where up to 32 setpoints with 9-bit resolution can be programmed. The output signal is pulse-width modulated or biphase-M.

Features

• Pin types (TO 92 UT)
• Internal temperature compensation
• Chopper stabilised
• Temperature compensation of the magnet material is programmable.
• Temperature range: -40°C ... +170°C
• Several times programmable
• "Lock" function
• Programming board with software availabe

Applications

• Contactless switches, e.g. in the automotive sector
• Measurement of rotational and linear movement, e.g. in mechanical engineering