austriamicrosystems has launched the AS5305, a magnetic linear motion encoder IC, aimed at linear motion and off-axis rotational measurements in applications such as industrial drives, x-y stages and electrical motors.
The AS5305 is a complete system-on-a-chip, combining Hall elements and a signal processor on one silicon chip. The device provides linear position measurement via a single-track or double-track multipole magnetic strip sliding over the IC. Using a cost-effective single-track magnetic strip, an incremental measurement with a resolution as small as 14 microns per position step can be obtained. It supports magnetic strips with pole-pair dimensions between 2,26 mm and 5,91 mm. An absolute linear displacement can be obtained by operating the AS5305 in conjunction with a double-track magnetic strip. The IC reads index information from the second magnetic strip, which represents a reference position within the mechanical displacement.
The AS5305 can also be used as an off-axis device for rotational measurements, in conjunction with a multipole magnetic ring. When used with a 32 pole-pair magnetic ring, for example, it is able to provide a resolution of 5120 positions per revolution. The device can operate at speeds of up to 9375 rpm with an integrated field strength indicator acting as an additional safety feature.
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