16-bit opto encoder with spi and serial / parallel outputs

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iC-LNG oBGA LNB2C-1R

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Short Lead Time
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Product Information

iC-LNG 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 exit 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 6-bit interpolator.

iC-LNG synchronizes the interpolator and singleturn data to form a contiguous Gray-coded position data word. A shift register or SPI interface are available for position data output. iC-LNG also outputs incremental A/B/Z signals, the resolution of which can be programmed.

After startup iC-LNG 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.

Test currents can be applied to test pins TPS, TNS, TPC, and TNC to simulate photocurrents. Allocation to various tracks can be selected as required, enabling a full function test of the IC with the exception of the sensors.


Applications:
• Optical position sensors
• Linear scales
• Absolute, incremental, and parallel encoders
• Motor feedback systems

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

Features

Excellent matching and technical reliability thanks to system-on-chip design with integrated photodiodes
Gray code scanning (11 digital tracks pitched at 400 m)
Sine/cosine analog track with electronic calibration
Diff. sine/cosine outputs with 1024 CPR (amplitude: 500 mV)
Position value of up to 16 bits through 6-bit interpolation
Quadrature signals with 1024, 2048, 4096, 8192, 16384 CPR
Index signal in phase with B low
14-bit parallel position data output
Serial data readout in 1 s cycles at 16 MHz clock frequency
SPI interface for configuration and position data output
3.3 V-compatible SPI and I/O ports
LED current control for a constant receive power (50 mA highside driver, sin+cos or sum)
Permanent parity monitoring of the internal RAM bits
Alarm for configuration and illumination errors (end of life)
Temperature range from -40C to 110C
Small outline, 30-pin optoBGA package for SMT
Illumination: iC-SN85 BLCC SN1C (850 nm encoder LED)
Code discs: LNG1S 42-1024 (1024 PPR, ? 42 mm/18 mm), LNG2S 25-512 (512 PPR, ? 24.8 mm/2 mm)
 

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