NEC Electronics America, Inc. recently announced the 78K0R/Kx3-L 16-bit All Flash microcontrollers (MCUs) for compact, low-power, battery-operated, and sensor-enabled systems. Based on NEC’s 16-bit 78K0R CPU core, the 78K0R/Kx3-L MCUs offer very low power consumption to extend battery life, and more on-chip integration to help reduce the size and cost of battery-driven and sensor-enabled systems such as fire and security alarms, meters, industrial sensors, anti-shake digital cameras, handheld medical diagnostics devices, and data-logging and point-of-sale terminals. The microcontrollers also offer on-chip oscillators, built-in circuits for sensor functions, and extended system operating time.
NEC Electronics has reduced standby power consumption in these devices (when only the real-time clock functions are operational) by 60 percent, from an average of 2.4 microamperes (µA) to 1.0 µA. Likewise, power consumption at a clock speed of 10 megahertz (MHz) has been reduced by 10 percent, from 3.9 to 3.5 milliamperes (mA), and a clock speed of 20 MHz by 20 percent, from 8.2 to 6.5 mA. This lowered power consumption contributes to higher overall performance in end systems, a necessity for designers of the latest battery-driven applications. The new MCUs also offer the industry’s highest power/performance ratio, moving the bar from 1.8 to 1.5 milliwatts (mW) per million instructions per second (Dhrystone 1.1).
Three on-chip oscillator circuits are able to generate three separate operating frequencies, one at the power-saving clock speed of 1 MHz, another at the high-performance clock speed of 20 MHz and a third at the conventional clock speed of 8 MHz, allowing users to select the most optimal operating frequency for a given application. An error rate of one percent at clock frequencies of 8 and 20 MHz eliminates the need to add an external oscillator for asynchronous data transfers, which demand high performance. This also contributes to lower costs and smaller sizes in end systems.
An optimized 12-channel, 10-bit A/D converter circuit improves the time it takes to convert analog input into digital output, thereby reducing signal conversion time from 6 to 3 microseconds (µs) — 50% faster than conventional products. Further, the addition of one internal operational amplifier channel and two internal comparator channels, in lieu of externally mounted peripherals, allows a wide range of analog data to be measured at low cost.
NEC Electronics’ 78K0R/Kx3-L MCUs also include a built-in dedicated booster circuit that reduces operating voltage during flash programming from 2.7 to 1.8 volts (V) and extends operating time in the end system.
More info: NEC 78K0R/Kx3-L Microcontrollers