6-Channel Phased Array Opto Encoder IC Series 33

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iC-PT 3324 is an optical sensor IC 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 differential +/- 4 mA push-pull drivers.

The built-in LED power control with its 40 mA driver stage permits a direct connection of the encoder LED. Regardless of aging or changes in temperature the received optical power is kept constant.

Selection input SEL chooses for three different operating modes: regular A/B operation, A/B operation with 2-fold interpolation, or analog operation. With analog operation the amplified signal voltages are available at the outputs for inspection and monitoring encoder assembly.

Typical applications of iC-PT devices are incremental encoders for motor feedback and commutation. To this end, device version iC-PT 3324 provides differential A/B tracks and a differential index track, each consisting of multiple photo sensors. The layout of the signal amplifiers is such that there is an excellent paired channel matching, eliminating the needs for signal calibration.

Additionally, three more tracks are provided to generate motor commutation information for the U, V and W outputs, for instance with 120 degree phase shift to operate 3-phase brushless motors. The period count and phase shift can be varied by the code disc applied.


• Incremental encoder
• Brushless DC motor commutation
• Industrial drives

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


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Monolithic photodiode array with excellent signal matching
Very compact size for small encoders
Moderate track pitch for relaxed assembly tolerances
Low noise signal amplifiers with high EMI tolerance
Single-pin programming of 3 operating modes: analog, digital (1024 CPR), and x2 interpolated (2048 CPR)
Analog signals for alignment and resolution enhancement
Selectable index gating: 1 T, 0.5 T (B-gated), 0.25 T (AB-gated)
Complementary outputs: A, B, Z and NA, NB, NZ
Up to 50,000 RPM at 1024 CPR (25,000 RPM at 2048 CPR)
U, V, W commutation signals (digital/analog)
All outputs +/- 4 mA push-pull, current-limited and short-circuit-proof
LED power control with 40 mA high-side driver
Single 3.5 V to 5.5 V operation, low power consumption
Operating temperature range of -40 C to +110 C (+120 C)
Code disc available: PT3S 33-1024 (glass 1 mm) OD ?33.2 mm, ID ?13.0 mm, optical radius 14.5 mm, 1024 ppr and 3 ppr commutation (120)

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