electronica: 16-bit MCUs with integrated USB enable high-speed charging, reduce power consumption by 60%

November 17, 2012

Toni_McConnel-November 17, 2012

The RL78/G1C Group of microcontrollers (MCUs) from Renesas Electronics Corporation are the first 16-bit MCUs that conform to the USB Battery Charging Specification Revision 1.2 and provide USB host/function interfaces. The USB BC 1.2 standard enables high speed charging up to 1.5 A.

USB ports as defined in the USB 2.0 standard cannot use currents in excess of 500 mA and as a result cannot support high-speed charging. By adopting the RL78 core, which the company claims has the lowest power consumption class in the industry, power consumption during USB operation is reduced by about 60%.

The first series within the RL78/G1C Group of MCUs will feature 32 to 48-pin devices in packages down to 5 × 5 mm, and up to 32 KB of flash and 5.5 KB of on-board RAM. The RL78/G1C also integrates a 1% accurate high-speed oscillator. Renesas is moving forward aggressively with the new RL78 series product deployments. At the same time as being able to contribute to lower power consumption in end products, with the new RL78/G1C Group of MCUs, Renesas now provides an extensive lineup that supports the addition of products that include USB battery charging functionality.


Samples of the RL78/G1C Group of MCUs are available now. Prices vary by USB peripheral functions and USB host functions including packages and number of pins. Mass production of the RL78/G1C devices is scheduled to begin in March 2013 and is expected to reach a scale of 1,000,000 units per month in March 2014.

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