8-bit MCUs feature high-accuracy oscillator circuit to control rotation in single-phase fan motors

October 11, 2013 // By Paul Buckley
8-bit microcontrollers equipped with an oscillator circuit that provides more than twice the accuracy compared with previous models has been developed by LAPIS Semiconductor Co., Ltd., a ROHM Group Company.

The ML610Q101 and ML610Q102 utilize motor control technology optimized for controlling rotation in single-phase fan motors. In addition, the industry-leading high-accuracy oscillator circuit reduces rotational variations, while multiple timers minimize noise. A hysteresis differential comparator is also built in that allows a Hall element to be used, contributing to lower costs. Additional features include a compact 16pin package 4 mm X 4 mm, ensuring compatibility with small fans, and high noise immunity (cleared the ±30 kV level in IEC61000-4-2 noise testing), making them ideal for applications with demanding noise requirements, such as industrial equipment, home appliances, single-phase fan motors, LED lights, battery charge controllers.

LAPIS Semiconductor has developed an integrated oscillator circuit and a regulator for logic power supply that does not require external capacitance, providing a two-fold improvement in oscillator accuracy compared with conventional models – the highest in the industry. This minimizes rotational variations with single-phase fan motor rotation control, while numerous timers provide quiet, high efficiency performance through soft switching*3 operation. As a result, the number of parts required can be reduced, since there is no need to add an external oscillator or capacitors for the logic power supply regulator. Plus, the compact package enables smaller mounting boards to be used.

Circuit and layout have enabled high noise immunity, making it possible to clear the ±30 kV level, which exceeds the measurement limit of Class 4 (±15 kV), the highest class defined by the IEC61000-4-2 standard established by the IEC (International Electrotechnical Commission). This makes the LSIs suitable for use in industrial equipment with stringent noise requirements.

A complete support system is provided, including an ML610Q102 reference board and software development environment that make it easy to begin evaluation of the ML610Q101 and ML610Q102.

Visit LAPIS Semiconductor at www.lapis-semi.com