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 是开发、制造和销售高性能半导体的领先厂商。Allegro 独具创新的解决方案服务于汽车市场中的高增长应用,此外也开发办公自动化、工业和消费/通讯解决方案。Allegro 公司总部位于美国马萨诸塞州伍斯特市,在世界各地拥有设计、应用和销售支持中心。有关 Allegro 公司的更多信息，请登录zh.allegromicro.com