Fujitsu expands 32-bit ARM MCU family; lower-power variants to follow

June 17, 2013 // By EDN
FM4 32-bit microcontrollers based on the ARM Cortex-M4F processor core offer greater processing power plus floating point hardware support with half the per-frequency power consumption of the Fujitsu FM3 family

Fujitsu Semiconductor designed these MCUs for applications that require advanced, high-speed computing performance – ranging from general-purpose inverters, servomotors, PLCs and other industrial equipment to energy-efficient, inverter-based consumer appliances. The FM4 family consists of a total of 84 MCUs and samples will be made available from July. The devices build on Fujitsu’s FM3 family, offering increased computational performance, enhanced peripheral functionality and an easy-to-use design.

FM4 MCUs in the MB9B560R/460R/360R/160R series can operate from 3 V or 5 V power supplies, and offer a range of memory options that includes SRAM, NOR flash, NAND flash and SDRAM. The MCUs feature an ultra-wide bus for on-chip flash memory that enables read access with no CPU wait state, to accelerate processing and reduce power requirements.

The Cortex-M4 core incorporates DSP and FPU functions for advanced computation. Algorithms for operating on-chip flash memory have been redesigned for greater speed and lower power consumption. The current required to run the real-time clock (RTC) and power the device via the dedicated VBAT pin can be limited to approximately 1.5 µA, making these high-performance MCUs useful even for standby power-conscious applications. The devices support a total of 100,000 rewrite cycles and data retention of up to 20 years.

“With our FM3 family, we have one of the broadest line-ups for MCUs based on the ARM Cortex-M3,” says Wolf Fronauer, Marketing Manager at Fujitsu Semiconductor Europe. “The new FM4 family offers our customers even more performance and peripheral functionality while seamlessly integrating with our existing portfolio of FM3 MCUs. This means customers can select highly optimised embedded microcontrollers that are an exact match for virtually any set of embedded application requirements, all without leaving the FM ecosystem. Later this year, we will launch the FM0+ family: based on ARM Cortex-M0+, this rounds off the portfolio by adding support for low-cost and ultra-low-power applications.”

The FM4 family also includes new peripheral functionality and enhances existing functions. The analogue