Encoder IC measures linear position, off-axis rotation

Unterpremstaetten, Austria — The AS5305 magnetic linear motion encoder IC from austriamicrosystems targets linear motion and off-axis rotational measurements in applications such as industrial drives, x-y stages or electrical motors. An automotive version, the AS5305A, for applications such as throttle, cam- and crankshaft position sensing as well as for high resolution motor control will be available in the first half of 2008.

The AS5305 is a complete system-on-a-chip that combines Hall elements and a signal processor on one silicon chip. The device provides linear position measurement via a single-track or double-track multi-pole magnetic strip sliding over the IC. Using a single-track magnetic strip, an incremental measurement with a resolution as small as 14 microns per position step can be obtained. The AS5305 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, said austriamicrosystems. 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 multi-pole magnetic ring. When used with a 32 pole-pair magnetic ring, for example, the AS5305 is able to provide a resolution of 5,120 positions per revolution. The device can operate at speeds of up to 9,375 rpm with an integrated field strength indicator acting as an additional safety feature.

The AS5305 is available now in a lead-free TSSOP20 package. The device operates at 5-V supply and is specified for an ambient temperature of -40° to +125°C. The automotive version will be fully qualified to AEC-Q100 and specified for ambient temperatures up to +150°C.

Pricing: $ 5.50 each in quantities of 1,000.
Product information: AS5305

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