iC-MNF: High-precision Vernier Interpolation

Calculating with 3 sin/cos Signals for Angle Resolutions up to 26 bit

iC-Haus presents at automatica 2018 (Hall B6, booth 521) among others, a new high-resolution Vernier encoder for optical and magnetic position sensors. Core technology of the iC-MNF device is a fast sine-to-digital converter in SAR architecture featuring an interpolation resolution of 14 bit and extremely short conversion times of only 2.3 µs. In the case of position sensing using Vernier scanning of several scales, this speed advantage is particularly beneficial.

For this purpose, iC-MNF simultaneously scans up to three sin/cos track signals. Interpolation and digitalization are executed sequentially. Using the configurable Vernier calculation for 2 or 3 tracks, excellent angular resolutions of up to 26 bit can be achieved which corresponds to 0.02 angular seconds in terms of 360 degrees.

iC-MNF: High-precision 3-channel encoder interpolator for optical and magnetic position sensors. (Photo: iC-Haus GmbH)
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iC-Haus launched its first Vernier encoder in 2006. The iC-MNF's converter core has now been completely redesigned. Thus, the signal-to-noise ratio has been doubled what significantly improves the accuracy of interpolation.
To achieve high signal quality when scanning rotary encoder code disks, using high-resolution scanning ICs such as iC-PN or the new iC-PNH of iC-Haus' EncoderBlue product family is recommended. In addition, iC-MNF also supports Hall and magnetoresistive sensors.

Application-oriented Interfaces for Simplified Implementation
In addition to an SPI interface for easy connection to microcontrollers, the small 7 x 7 mm QFN device contains a fail-safe RS422 transceiver for both BiSS C and SSI so that iC-MNF can directly be linked to corresponding controls. The IC now provides even more accurate status information for monitoring and diagnostics.

In addition, a new feature is for example an integrated temperature sensor. Thus, in many applications, an external temperature sensor is not required. Furthermore, due to a multi-turn interface that supports both SSI and BiSS, the new iC-MNF can also be configured to read position data from multi-turn position sensors such as iC-PVL. The IO pins are designed for applying the IC directly to a 3.3 V microcontroller.

Automatic On-Chip Calibration
Another highlight of iC-MNF is the possibility of an automatic on-chip calibration. This accelerates setting up operation and opens up new applications, for example in embedded systems where it is now possible to execute a calibration via a microcontroller directly inside the application. The on-chip calibration compensates i.a. residual errors and thus reduces the overall adjustment effort to a minimum.
iC-Haus considers itself not only a supplier of IC devices, but rather a partner for its customers, supporting them with individual solutions.
For development and testing of Vernier encoder solutions, the company also offers application-oriented evaluation boards and sophisticated software tools.

Further product information: www.ichaus.com/MNF.

Background: Vernier Principle
Typical applications for iC-MNF are absolute Vernier-based position encoders. As in the Vernier caliper, which scale principle was introduced by the French mathematician Pierre Vernier as early as the 17th century, the reading accuracy is increased due to several scales - the absolute position information being contained in the relative phase position of the signals to each other. This requires a special kind of evaluation which the new encoder interpolator iC-MNF is able to accomplish with an interpolation resolution of now 14 bit.

For any queries, please contact:
Magnus Meier
iC-Haus GmbH, Am Kuemmerling 18, 55294 Bodenheim, Germany
Tel. +49 6135/9292-300 Web: www.ichaus.com
Fax +49 6135/9292-192 E-Mail: magnus.meier@ichaus.de

Introducing iC-Haus
iC-Haus GmbH is a leading, independent German manufacturer of standard iCs (ASSP) and customized ASiC semiconductor solutions with worldwide representation. The company has been active in the design, production, and sales of application-specific iCs for industrial, automotive, and medical applications for more than 30 years.
The iC-Haus cell libraries in CMOS, bipolar, and BCD technologies are specifically suited to realize the design of sensor, laser/opto, and actuator ASiCs, amongst others. The iCs are assembled in standard plastic packages or using the iC-Haus chip-on-board technology to manufacture complete microsystems, multichip modules, and optoBGA/QFN in conjunction with sensors.
Further information is available at
For more information, please contact:

iC-Haus GmbH
Am Kuemmerling 18, 55294 Bodenheim, Germany
Tel. +49 6135/9292-300
Fax +49 6135/9292-192

June 2018

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