Programmable 12-Bit Sin/Cos Interpolation IC with RS422 Driver

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iC-PI is an interpolator with a non-linear A/D converter which digitizes sine/cosine sensor signals using a count-safe vector tracking conversion with selectable resolution and hysteresis.

The angle position is output incrementally by differential RS422 drivers as an encoder quadrature signal with a zero pulse.

A pre-selectable minimum edge distance ensures glitch-free output signals and prevents counting errors which in turn boosts the noise immunity of the position encoder.

The integrated signal conditioning unit allows signal amplitudes and offset voltages to be calibrated accurately and any phase error between the sine and cosine signals to be corrected. As angle data is offered to the I²C interface, signal adaption can be easily automated using an MCU.

Symmetry Electronics is an authorized iC-Haus distributor.


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Latency-free sine-to-digital conversion
Decimal/binary resolutions of up to 4000/4096 steps per input cycle
High input frequency: 500 kHz (x10), 80 kHz (x100), 8 kHz (x1000)
Flexible pin assignment using signal path multiplexers
PGA inputs for differential and single-ended signals
Variable input resistance for current/voltage conversion
Signal conditioning for offset, amplitude, and phase
Controlled 50 mA current source for LED or MR sensor supply
Fault-tolerant RS422 output via adjustable drivers up to 50 mA
Glitch-free due to guaranteed minimum edge distance
Zero signal conditioning and electronic index pulse generation
Output of motor commutation signals: UVW with 1 to 8 cycles
15-bit period counter for the evaluation of distance-coded reference points
IC slave interface for both period and angle data as well as in-circuit calibration
IC multi-master interface for configuration from external EEPROM
Adjustable over-temperature alarm and shutdown
Supply from 4.3 to 5.5 V, operation from -40C to +100C
Reverse-polarity-proof, including the sub-system

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