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STMicro MCU features on-chip motor control peripheral

Posted: 26 Feb 2004 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st7? microcontroller? mcu? st7mc?

STMicroelectronics has extended its ST7 family of 8-bit microcontrollers (MCUs) with the launch of the ST7MC family for the control of three-phase induction and permanent magnet brushless motors (including compressors).

The ST7MC devices feature the company's on-chip motor control peripheral (MTC), which consists of a three-phase Pulse Width Modulator multiplexed on six high-sink outputs, with a highly flexible Back EMF (BEMF) zero-crossing detector and coprocessor unit for the sensorless control of permanent magnet Brushless Direct Current (BLDC) motors.

The MTC's input pins can be configured for Hall, tachometer or encoder sensing, while the comprehensive filters and settings allow the control of any star or delta wound motor, from 12V to 240V, in various control topologies (six-step/Sine wave, Current/Voltage, PAM/PWM).

In a typical brushless motor design based on the ST7MC, some 70 percent of the CPU's resources remain free for the rest of the application as a result of the MTC peripheral handling the detailed motor control functions. The device can therefore handle both motion and upper layer functions, opening up new capabilities compared to classical three-phase brushless solutions.

Samples of the ST7MC family are available in all packages and in several flash memory sizes. The ST7MC starter kit, a full featured evaluation and development tool which provides both a demonstration of the product's capability and a short-cut development platform for target applications, will be available in March 2004.

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