24-pin MCUs with IOs to support p to 13 sensors

24-pin MCUs with IOs to support p to 13 sensors

New Products |
By Jean-Pierre Joosting

Designed to connect to multiple sensors and convert the sensor output signals to digital data, these sensor hubs are intended for use with a wide range of connected devices, addressing not only miniaturization, lower power, and extended battery life in sensor hub and sensor application systems, but also the need for reduced user prototyping and development periods. Renesas will also provide a comprehensive development environment that includes evaluation boards, development tools, and software.

The RL78/G11 MCUs claims to support the industry’s largest number of sensors in an MCU with 24 pins. The 24- and 25-pin versions of these new MCUs support 11 analogue input channels and six serial communications channels. With the 24-pin compact package, the MCUs can support signal inputs from a maximum of 13 sensors. Processing of the signal inputs from the sensors by the built-in analogue functions and serial communications (reception) functions that operate even in standby mode allows low-power control, even in systems with multiple sensors.

They provide extended features, such as high-speed wakeup, which transitions the CPU from standby mode to CPU operation in 4 μsec and flash operating mode transitions that optimize the CPU operating performance and that contribute to energy savings. These MCUs also support battery voltage measurement and sensing referenced to an internal fixed voltage that operates from a 1.8V power supply.

The RL78/G11 Group concept is based on small packages from 20 to 25 pins, with small 16 kB flash memory and rich analogue peripherals such as A/D converters, D/A converters, comparators, and PGA. These are configurable, such as PGA+ADC+VBGR, PGA+CMP, CMP+DAC/VBGR, or PGA+CMP+DAC/VBGR. It also supports very low power operation (100 µA @ 1 MHz) and a high-speed 4 µsec wake up. Available in 3 x 3 mm WFLGA , 4 x 4 mm HWQFN and standard 20-pin LSSOP, this MCU Group is suitable for sensor applications, lighting/power sources and various small appliances.

Renesas is developing ultra-compact promotion boards and easy-to-use programming tools for these new devices. These tools will support program debugging and downloading, and can also support prototyping using breadboards and conductive ink pens. The programming tools allow MCU programs to be developed using only GUI operations. Periodical operation using the standby functions is supported. Renesas is moving forward in providing a new easy-to-use development environment that will allow prototyping and evaluation operations to be completed in a single day, where previously it would have taken an entire week.

Features include timer functions that support complementary PWM output and forced cutoff, safety functions that can detect and diagnose incorrect hardware operation, multichannel serial communications functions, timer functions that support flyback control, and an INTFO (function that directly outputs interrupt flags generated by timers, the data operation circuit (DOC), and other functions, to device pins) that can directly output interrupt signals from external pins. Using smart features like DTC and ELC (Data Transfer Controller /Event Link Controller) peripherals can be connected internally to reduce CPU workload and can save overall power consumption.

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