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Optoelectronics/Displays  

Optoencoder claims clock rates of up to 16MHz

Posted: 24 Oct 2011     Print Version  Bookmark and Share

Keywords:optoencoder  optoelectronic scanner  linear displacement 

iC-Haus GmbH unveils a multi-channel, optoencoder, iC-LNG device that claims to deliver clock rates of up to 16MHz for cycle times of less than 1µs.

The iC-LNG is said to be geared for the capture of absolute position data for linear displacement measuring systems or rotary encoders. The iC-LNG claims its exceptionally small design that is achieved by combined scanning of a 10bit Grey code in addition to an analogue signal track. According to the company, this is evaluated using real-time interpolation that extends the position value to 16bits.

iC-LNG's sensor array requires a code width of just 5.4mm, enabling smaller code discs or larger hollow shaft diameters to be used. The LED lighting unit is also much more compact, added iC-Haus. The optoencoder offers a suitable light source with a particularly energy-efficient LED. iC-LNG controls the level of illumination and acts as a monitor while a separate alarm output indicates any lighting errors.

Offset and amplitude compensation has been integrated for the correction of the analogue track signals that are also output as differential sine and cosine signals through four ports. The interpolation error can be reduced by signal correction to gain more precise position data. This setting is also beneficial to the incremental signals that are also provided. iC-LNG supplies A/B/Z signals with 1,064 to 16,384 pulses in selectable binary grades.

iC-LNG

iC-LNG can deliver clock rates up to 16MHz for <1µs cycle time.

The position data can be output in parallel (up to 14bits) or in series using a fast shift register. Alternatively, the 3.3V-compatible SPI interface can be used that was implemented for the configuration of the device. iC-LNG operates from 4-5.5V within an operating temperature range of -40°C to 110°C. All functions are available up to a maximum speed of 12,000rpm. The device comes in a 30-pin optoBGA package with a pre-assembled reticle and requires about 7x8mm of board space.

iC-LNG supplements the iC-Haus portfolio of absolute optoencoders with its medium resolution, complexity and simple operation using the SPI interface. LEDs, code discs, a demo board and a ready-to-operate MCU board that can be connected up to a PC are available for evaluation.





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