2-Channel-Interpolation Circuit with Nonius Calculation GC-NIP
Features
| Interpolation rates 32 to 8192 | Output signals: ABZ, SPI, SSI, BiSS |
| Input frequency up to 130 kHz | EEPROM, Reference point adjustment, counter-preset |
| Nominal amplitude 75 mVpp … 1000 mVpp | Operating voltage 3,3 V / 5 V (with level shifter GC-LS) |
| Adjustable low pass filter at input 10 kHz … 150 kHz | Package QFN64(9 mm x 9 mm) |
| Constant delay max. 8µs bei 26 MHz Taktfrequenz |
Temperature range: -40°C … +125 °C |
| Integrierted patented control algorithm |
The input signals are subjected to an AMAC-specific internal gain and offset control and the signal period is divided up to 8192 times. For the absolute position of a two-channel nonius system, a resolution of up to 22 bit can be achieved.
Input and output of the GC-NIP are designed for 3.3V interfaces. The IC comprises six instrumentation amplifiers with adjustable gain factors. Encoders with voltage interface or measuring brigdes can be connected directly. Sensors with current interface and photodiode-arrays are adapted by a simple external circuit. The IC operates on both single-ended or differential input signals. The noise of the sensor signals is prevented by a switching analog filter. Additionally, a digital hysteresis can suppress the edge noise of the output signals at low input frequencies and at standstill.
The quality of the signals issued by the sensors is monitored in the IC. For that purpose it is possible to activate 9 sources separately producing an error signal. For the calculation of the absolute position a set of sensor- or scale-specific correction coefficients can be placed in the EEPROM of the IC. In that way, harmonics of the sinusoidal signals or inaccuracies of the measuring scale do not lead to errors in the absolute position value. The determination of the correction coefficients is realized by a simple software-based calibration procedure.
Providing absolute position and incremental square-wave-signals (ABZ) in parallel, the GC-NIP is well-suited for the use in motor-feedback-systems. The four integrated output interfaces (ABZ/SPI/SSI/BiSS) and further features like the multi-stage trigger signal processing, the processing of distance coded reference marks, the possibility to adjust the reference mark as well as adjustment and storage of the zero position make the IC suitable for direct use in industrial controls or in fast absolute or multi-channel incremental position measuring systems. The GC-NIP can be configured according to specific applications using the integrated EEPROM, via configuration inputs or via the serial interface (SPI/BiSS).
Technical Data
Interfaces
| Analog input |
Sinusoidal/ cosinusoidal / reference (index) signals, differential oder single-ended; Adjustable amplification for 660 mVPP/250 mVPP /120 mVPP /60 mVPP Input frequency max. 130 kHz for all Resolutions |
| ABZ | 90° square-wave sequences (A/B/Z) Adjustable width of zero signal Z to ¼ or 1 period A/B Service signale for sensor adjustment |
| SPI | 30-bit counter value / 9-bit sensor state Up to 15 MHz, compatible to standard-SPI 16Bit Up to 500.000 measurement values per second Signal filtering for suppression of disturbances |
| SSI | 30-bit counter value / 2-bit sensor state Gray code / binary code Adjustable timing, SSI ring operation |
Interpolation/Signal Processing
| Interpolation rate | Nonius calculation: 256 ... 8192 Interpolation (ABZ): 32 ... 8192 |
| Signal correction |
AMAC-specific digital controller for the offset, control range ±10 % of the standard amplitude AMAC-specific digital controller for the amplitude, control range 60%...120% of the standard amplitude Digital potentiometer with 64 steps for phase correction; selectable range ±5° or ±10° |
| Suppresion of disturbances |
Selectable low pass filter 10 kHz, 75 kHz, 150 kHz, disabled Digital hysteresis for suppression of the edge noise at the output (configurable 0 … 7) Selectable minimum edge distance at the output |
| Reference mark adjustment | Selectable reference mark position Definition of the optimum reference position via SPI or service signals Processing of distance coded reference marks Measured-value trigger at the reference mark position |
| Miscellaneous | 2-stage measured value trigger Preset signal for adjustment and storage of the zero position of the sensor Integrated EEPROM for configuration |
Important Characteristics
| Package | QFN64 (9 x 9 mm) |
| Operating voltage | 3,3 V / 5V-operations with Levelshifter GC-LS possible |
| Temperaturbereich | -40 … +125 °C |
Downloads
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Infosheet
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Datasheet
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Software
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| Product Type | Description | Article Number |
| GC-NIP | Nonius Interpolation Circuit GC-NIP, QFN64 | PR-44800-00 |
| GC-NIP | Demoboard for Nonius-IC GC-NIP | PR-44810-00 |
| GC-LS | 4-channel / analog Level-Shifter 5 V to 3,3 V, QFN32 |
PR-44500-00 |
| USB to SPI Adapter | USB-Adapter to SPI-Interface | PR-44500-00 |
| USB to Biss Adapter | USB-Adapter to BiSS-Interface | PR-44030-00 |