austriamicrosystems introduces AS5311 encoder with submicron resolution
This integrated linear Hall encoder can be used as an alternative to optical encoders. For linear motion sensing, a multi-pole magnetic strip is used and for rotary motion sensing the magnetic strip is replaced by a multi-pole magnetic ring. For applications like this, an incremental output with a resolution of 10 bit per pole pair and a travelling speed up to 650mm per second is available. Using for example a multi-pole magnetic ring with a diameter of 41.7mm, a resolution of 16 bit (65.536 steps per revolution) can be achieved.
In conjunction with a 2mm pole-pair magnetic strip, the AS5311 provides a 1.95 micrometer resolution signal at its incremental output and a 488 nanometer resolution signal at its serial output.
AS5311 together with the magnetic strip are the only two components required to build a robust submicron-resolution position feedback system. This small form factor allows AS5311 to be integrated in autofocus, zoom and vibration reduction systems in cameras, switching systems in fiber optics or other micro-positioning applications where tight space is a concern and high resolution is demanded.
austriamicrosystems encoder chip also provides extended diagnostic features that constantly monitor the placement of the magnet above the device. These features allow early detection of mechanical systems failures. In addition, the device compensates for the adverse effects of unwanted external magnetic fields thus ensuring additional safety and robustness of the system.
The AS5311 can be operated with either 3.3V or 5V supply voltage and is available in a 20-lead TSSOP-package. The device is specified for an ambient temperature range from -40° to +125°C.
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