The ST7MC family is built around an industry-standard 8-bit core. All devices feature standard MCU peripherals, and ST´s on-chip motor control peripheral, the Motor Control Cell, which consists mainly of a three-phase Pulse Width Modulator multiplexed on six high-sink outputs, with a highly flexible Back EMF (BEMF) zero-crossing detector and co-processor unit for the sensorless control of permanent magnet Brushless Direct Current (BLDC) motors. ST´s patented ´three resistors´ sensorless control method - in conjunction with on-chip comparators, op-amp - provides the lowest possible system cost and the highest system integration for BLDC motor control.

Key features and benefits

• Single micro approach for control of three-phase induction and BLDC motors
• Flexibility with Family approach: 32-pin to 80-pin, 8k to 60K Flash/ROM
• Easy to program, reduced time to market
• Suitable for a wide range of motors (including compressors) from 12 to 300V and sensor/sensorless control topologies
• Trapezoidal 6 Step or Sine Wave Signal output, Voltage/current mode, PWM or PAM control
• Very low system cost, few external components
• 70% of CPU available for non-motor control related tasks
• Small footprint. Fits inside motor housing
• Automotive applications compliant
• Very low-cost, real-time development tools