The need for more efficiency and reduced system costs for motor-driven appliances, such as vacuum cleaners, dishwashers and refrigerators, as well as electric power tools are driving a shift from traditional motors with built-in position sensors to sensor-less BLDC motor systems. The new RL78/G1F MCUs integrate fast 3-phase timer and dedicated comparators and operational amplifiers to ensure high-speed sensor-less control.

The peripheral functions required for sensor-less control, including high-speed timers and comparators, contributing to reduction of up to 20 external components and lower development costs. In addition, Renesas has added an auxiliary timer designated for motor control to enable better control at a wider range of speed.

Features:

－ Dedicated motor control subsystem with the new auxiliary timer supports operation at up to 64 MHz

－ Software configurable, high slew rate PGA reduces cost and simplifies development

－ Two-channel high-speed comparator enables reliable overcurrent detection and rotor position detection

－ 4 mm × 4 mm package reduces PCB footprint for more compact applications