Devices in the iC-PT series and iC-LTA are versatile optical encoder iCs with integrated photosensors whose signals are converted into voltages by low-noise transimpedance amplifiers. Precise voltage comparators with hysteresis are used to generate the digital signals, supplied to the output pins via CMOS/TTL-compatible differential push-pull drivers.
The built-in LED controller with its 40 mA high-side current source directly powers the encoder LED and maintains the operating point regardless of LED aging or changes in temperature. The optical receiver power is kept constant using several A/B track photodiodes for averaging.
• Incremental encoders
• BLDC motor commutation
Selection input SEL enables three different operating modes to be selected: regular A/B operation, A/B operation with 2-fold interpolation or analog operation (inspection and monitoring encoder assembly).
Typical applications for iC-PT iCs and iC-LTA include incremental encoders for motor feedback and commutation. To this end, the iCs provide differential scanning for the A/B tracks and the Z index track and single-ended scanning on three additional tracks, generating commutation signals for multipole BLDC motors depending on the code disc applied.
Symmetry Electronics (and its e-commerce division: SemiconductorStore.com) is an authorized iC-Haus distributor.