16-Bit Opto Encoder with SPI and Serial/Parallel Outputs

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iC-LNG is an optoelectronic encoder IC for absolute linear and angle measuring systems. Photosensors, amplifiers, and comparators, an LED power control and an adjustable signal conditioning unit have been monolithically integrated into the device, as have the necessary interfaces for configuration and data output.

• Absolute position sensors
•  Linear and rotary encoders
•  Motion control
iC-LNG derives the position data from an analog sine/cosine track and 10 or 11 Gray-coded digital tracks. Using the integrated 6-bit flash interpolator absolute position data of up to 16 bits can be generated in real time. Output is through an SPI interface, a fast shift register, or a 14-bit parallel interface.

iC-LNG also has incremental encoder quadrature signals with an index and conditioned sine/cosine signals from the analog track at its disposal. The number of pulses for the quadrature signals can be varied.

The integrated LED power control with a driver stage allows the transmitting LED to be directly connected and keeps the optical receive power constant with changes in temperature and throughout the device lifetime.

The chip is configured through the 3.3 V and 5 V-compatible SPI interface by an external microcontroller. Various error messages are provided for the monitoring of functions (illumination error, undervoltage error, and configuration error).

Symmetry Electronics (and its e-commerce division: SemiconductorStore.com) is an authorized iC-Haus distributor.


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Excellent matching and reliability thanks to integrated photosensors
Very compact array size
Gray code scanning by 11 digital tracks pitched at 400 m
Sin/cos track with adjustable signal conditioning
Differential sin/cos outputs with 1024 CPR and 500 mVpk
6-bit flash interpolation for 16-bit singleturn resolution in real time
Encoder quadrature signals with 1024, 2048, 4096, 8192, 16384 CPR
Gated index signal, in phase with B low
Parallel data output of 14 bits
Serial data readout in 1 s cycles at 16 MHz via a 14/16-bit shift register
3.3 V SPI interface for configuration and data output
LED power control (mean or sin/cos square) with a 50 mA highside driver
Permanent monitoring of RAM parity bits
Alarm indication for configuration and illumination errors (end of life)
Undervoltage detection
4 V to 5.5 V single supply operation, low power consumption
Operating temperature range of -40 C to 110 C
Available accessories: LED lamp and code discs (512 CPR, 1024 CPR)
30-pin optoBGA or 38-pin optoQFN package for SMT

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