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IC-NQI Datasheet(PDF) 2 Page - IC-Haus GmbH |
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IC-NQI Datasheet(HTML) 2 Page - IC-Haus GmbH |
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2 / 26 page  preliminary preliminary iC-NQI 13-bit Sin/D CONVERTER WITH CALIBRATION Rev A2, Page 2/26 DESCRIPTION iC-NQI is a monolithic A/D converter which, by ap- plying a count-safe vector follower principle, converts sine/cosine sensor signals with a selectable resolu- tion and hysteresis into angle position data. The front-end amplifiers are configured as instrumen- tation amplifiers, permitting sensor bridges to be di- rectly connected without the need for external resis- tors. Various programmable D/A converters are avail- able for the conditioning of sine/cosine sensor signals with regard to offset, amplitude ratio and phase er- rors. Front-end gain can be set in stages graded to suit all common differential sensor signals from ap- proximately 20 mVpp to 1.5 Vpp, and also single-end sensor signals from 40 mVpp to 3 Vpp respectively. Two serial interfaces have been included to permit configuration of the device: I2C for the connection of an EEPROM and a 2-wire interface for configuration from a microcontroller. A low signal at pin NPRG is required to release the 2-wire interface for program- ming, whereas a high signal at pin NPRG preselects the serial output of measurement data. For measurement data output, the fast synchronous- serial 2-wire interface can follow an SSI protocol at clock rates of up to 4 Mbit/s, or a BiSS unidi- rectional protocol featuring error messages and a CRC-protected transmission at clock rates of up to 10 Mbit/s. A configurable period counter can supple- ment the measurement data by a multiturn count of up to 24 bits. At the same time any changes in output data are converted into incremental A QUAD B encoder sig- nals. Here, the minimum transition distance can be adapted to suit the system on hand (limitations due to counter input frequency, cable length, EMI). A syn- chronized index signal is generated and output to Z if enabled by the PZERO and NZERO inputs. If the EEPROM is detected following a power-down reset, the CRC-protected chip setup is read in auto- matically. |
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