18-Bit Opto Encoder with SPI and serial/parallel outputs

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iC-LNB is an optoelectronic encoder IC for absolute linear and angle measuring systems, such as glass scales and encoders. Photodiodes, amplifiers, and comparators, the entire signal conditioning unit, and interfaces for position data output have been monolithically integrated into the device.

An integrated LED current control with a driver stage allows a transmitting LED to be directly connected (e.g. iC-SN85). The optical receive power is kept constant by the control unit, regardless of temperature and aging effects. The receive power setpoint can be programmed. Should the LED current control exceed its operating range, this is indicated at the error message output (end-of-life alarm at pin ERR).

The photocurrent offset and photocurrent amplitude of the analog sine/cosine signals can be calibrated. These calibrated voltage signals are lead out to pins PSIN, NSIN, PCOS, and NCOS and are used by the integrated 8-bit vector-tracking interpolation circuit.

iC-LNB synchronizes the interpolator and singleturn data to form a contiguous Gray-coded position data word. 16 parallel ports, a scalable shift-register, the SPI interface, as well as incremental A/B/Z signals are available for data output. By help of the unique ’FlexCount’ circuit any angle resolution between 4 to 2 18 angle steps per revolution can be preset for the incremental signals and the absolute position value.

After startup iC-LNB is configured using the SPI interface. To make connection to a 3.3 V microcontroller easier, all digital I/O ports, including the SPI, can be run on 3.3 V.

• Optical position sensors
• Linear scales
• Absolute rotary encoders
• Programmable incremental encoders
• Motor feedback systems

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


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System-on-chip design for excellent reliability
Leading/trailing sampling of 10 binary tracks pitched at 400 m
Analog sine/cosine scanning with enlarged photodiodes, signal conditioning and fast 8-bit vector-tracking interpolation
Absolute singleturn resolution of up to 18 bit
Unique FlexCount circuit: freely selectable resolution for absolute and incremental data
Incremental quadrature outputs with 1 to 65,536 CPR and programmable index signal
LED illumination control by 50 mA high-side current source (sin +cos or sum control modes)
Alarm indication for configuration or illumination error
Permanent RAM monitoring by parity bits
3.3 V-compatible SPI and I/O ports for configuration and data
Serial data readout in 1 s cycles at 16 MHz clock frequency
Parallel position data output for 16 bit
Operation at 4 V to 5.5 V within -40 C to 110 C
30-pin optoBGA or 38-pin optoQFN package for SMT
Illumination: iC-SN85 BLCC SN1C (850 nm encoder LED)
Code discs: LNB1S 42-1024 (1024 PPR, ? 42 mm/18 mm), LNB4S 26-1024 (1024 PPR, ? 26.0 mm/9.6 mm)

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