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8bit MCUs armed with oscillator circuit for industrial apps

Posted: 16 Oct 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Lapis? microcontrollers? oscillator circuit? motor control? LED lights?

Lapis Semiconductor has recently developed 8bit microcontrollers that are equipped with an oscillator circuit that provides more than twice the accuracy then the company's previous offerings. Both the ML610Q101 and ML610Q102 uses a motor control technology optimised for controlling rotation in single-phase fan motors.

The company's high-accuracy oscillator circuit reduces rotational variations, while multiple timers minimise 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 4x4 mm, ensuring compatibility with small fans, and high noise immunity (cleared the 30kV 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 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. This minimises 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 30kV level, which exceeds the measurement limit of Class 4 (15kV), the highest class defined by the IEC61000-4-2 standard established by the IEC. This makes the LSIs suitable for use in industrial equipment with stringent noise requirements.

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