Bullet Sensors & Transducers e-Digest, Vol. 126, Issue 3, March 2011: Product News

    (ISSN 1726-5479)

 

 

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New Optical, 6-channel Incremental Encoder IC for the Electronic Commutation of Small Motors

 

The new optical sensors iC-LTA and the iC-PT series supply incremental and commutation signals in the smallest possible design space. They are based on a flat optoQFN that is a mere 0.9 mm thick with a ultrathin glass lid. The optimized phased array structure of the photochips means that a minimal scanning area of just 1.9 mm x 3.1 mm is enough to generate 2,500 pulses from a code disc measuring only 26 mm across, for example.

 

iC-PT sensors and measurement standards for diameters of 26 mm (iC-PT2613) and 33 mm (iC-PT33xx) are available. iC-LTA is a functionally compatible yet unstructured photo array for specific customized design. The Hall sensors used for motor commutation to date have been replaced by three separate on-chip scanning tracks. Here, the code disc stipulates the required signal and can be easily designed to suit the required motor pole count.

 

The photocurrent signals are conditioned by low-noise CMOS amplifiers and can either be comparated or interpolated twice and output through 4 mA push/pull drivers as indexed encoder quadrature signals. Output frequencies of up to 800 kHz are permitted, enabling motors with speeds of up to 20,000 rpm to be controlled (at 2,500 pulses). Analog test signals can be activated for assembly and alignment.

 

The small sampling area and a high sensitivity help to reduce the amount of power needed for the obligatory LED; a few milliamps of operating current are sufficient. This improves the expected lifetime of the LED, especially if the motor has high operating temperatures. Devices iC-LTA and iC-PT control the LED themselves and also compensate for fluctuations in the operating temperature range of -40C to +120C.

 

Using the latest encoder LEDs, such as iC-TL85 or iC-SD85, for example, the system current consumption is ca. 12 mA. A supply voltage starting at just 3.5 V is enough and enables an external polarity protection circuit and voltage regulator to be added if required when the device is operated on 5 V.

 

 

Introducing iC-Haus

 

iC-Haus GmbH is a leading independent German manufacturer of standard iCs (ASSP) and customized ASiC semiconductor solutions. The company has been active in the design, production, and sales of application-specific iCs for industrial, automotive, and medical technology since 1984 and is represented worldwide. The iC-Haus cell libraries in CMOS, bipolar, and BCD technologies are fully equipped to realize the design of sensor, laser/opto, and actuator ASiCs. The iCs are assembled either in standard plastic packages or using chip-on-board technology to manufacture complete microsystems, multichip modules and optoBGATM, the latter in conjunction with sensors.

 

 

Contact:

 

Horst Huse

HT-Analyst/iC-Haus

Scherangerweg 2

D-85465 Langenpreising

Germany

Tel.: +40 8762 2850, fax: +49 8762 2805

E-mail: horst-huse@ht-analyst.de

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