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Sensors/MEMS??

Encoder suits cost-sensitive apps

Posted: 18 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:austriamicrosystem? austriamicro? as5035? magnetic rotary encoder? rotary encoder?

An 8bit incremental magnetic rotary encoder designed for cost-sensitive industrial and automotive applications was recently unveiled by austriamicrosystems.

"The AS5035 is an ideal encoder solution for cost-sensitive applications which have up until now been using optical encoder solutions,&quot said Ralf Kodritsch, marketing manager for Sensors & Automation at austriamicro. "Especially in harsh environments, magnetic encoders provide significant advantages over optical encoders, such as during operation in dusty environments or at high temperatures,"

The new AS5035 provides incremental quadrature A/B output signals and an index output signal. The index signal represents a mechanical reference point, called the zero position, which can be programmed by the user at the system assembly stage. "The ability to program the zero position at the system assembly stage is another feature that our customers highly value in our magnetic encoder products," added Kodritsch. "For example, the user can simply adjust each individual knob reference position in a front panel application at a final manufacturing step." Operation safety is ensured by continuous monitoring of the magnet presence and the optimal magnet position in the system.

The AS5035 provides 64 pulses per revolution on each of the two quadrature output channels, which equals a resolution of 1.4 per edge over a full turn of 360. Operation safety is ensured by a failure detection feature, which monitors the magnet's placement during the operation. In case of a missing or loose magnet, the device instantly provides a warning signal. The IC operates at rotational speeds up to 10,000 revolutions per minute, without missing any incremental pulses.

Target human-machine interface (HMI) applications for the AS5035 include front panel switches, or as an alternative to optical encoder-based applications where dust or other particles could diminish the reliability and accuracy of the system operation.

The new encoder operates at either 3.3V or 5V, with an operating temperature range between -40C and 125C. The AS5035 is available in a lead-free SSOP 16 (5.3-by-6.2mm) package. This device will be available for sampling next month (May 2005).




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