Allegro MicroSystems, Inc. Announces New Unipolar Two-Phase Microstepping Motor Driver

Multi-Chip Structure in a 18.6 x 9.9 x 2.3 mm Surface-Mount Package

July 7, 2011

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Worcester, MA - Allegro MicroSystems, Inc. announces a new unipolar two-phase constant-current mode motor driver IC which is manufactured and developed by Sanken Electric Co., Ltd. in Japan. The SI-7321M features an efficient unipolar driver design for full- and half-step operation, and 1/4 , 1/8 , and 1/16 microstepping. The clock-in type input interface allows simplified control logic, with the flexibility of sequencer timing using either rising Clock edge only or both rising and falling edges. Additional flexibility is provided by user-configurable blanking time, and load circuit short or open protection (patent pending). Along with inputs for built-in sense current detection, these features minimize power losses. This new motor driver is targeted at the office automation and industrial equipment markets.

The device has a multi-chip internal structure for lower thermal resistance. The control IC (MIC) and the four power elements (MOSFET) are all separate ICs. The package (HSOP) provides wide output terminals at each corner, further enhancing device thermal dissipation.

The built-in excitation distribution circuit (sequencer) allows motor control using only the Clock signal for simple operations (forward, reverse, hold), with motor speed control by frequency input into Clock pin, and rotation direction control by a dedicated logic input. This eliminates logic signal lines required for conventional phase-input methods, and reduces demand on heavily-used CPUs.



Allegro MicroSystems, LLC is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at www.allegromicro.com.


Editorial Contact:

Stephanie Fennelly
Director - Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com
.

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