21-Bit Optical Position Encoder

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iC-LGC is an optoelectronic encoder iC for absolute position sensors. Photosensors, amplifiers and comparators, the entire signal conditioning and data processing unit and fast I/O interfaces are monolithically integrated on the chip.


• Absolute position encoders for safety-related controls
• Analog and digital motor feedback systems
• Robotics, tooling machines, servo drives

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


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System-on-chip design with integrated photosensors
Excellent matching and reliability
Differential scanning for EMI immunity and operation up to 125 C
Enlarged assembly tolerance due to pre-positioned and post-positioned code scanning
13 digital tracks pitched at just 500 m
2 sine/cosine tracks with analog signal conditioning
Singleturn resolution of 16 to 21 bits by 3-bit flash or 8-bit S&H ADC
Multiturn data processing via 2-pin A/B or SSI interface, embedded low power counter for battery supply
LED power control with a 50 mA highside driver
Adjustable temperature sensor with min/max alarm
Operational monitoring and alarm/warning messaging: missing code step, disc data error, configuration error, LED end-of-life, out-of-range temperature
Safety features: CRC-protected setup with verification, CRC-protected data output with life counter
Operating modes: hardware encoder (up to 16 bits), serial encoder (SSI, BiSS C), parallel encoder (8-bit parallel C)
4 to 5.5 V single supply operation, low power consumption
Small-outline optoBGA or BLCC package for SMT
Available accessories: LED lamps and code discs
Options: extended temperature range of -40 to +125 C, customized COB modules, customized code designs

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21-Bit Optical Position Encoder
Part #: IC-LGC-OBGA-LG21C-2-36R
21-Bit Optical Position Encoder