Renesas RE01 256KB Microcontroller (MCU) Family
Ultra-low power MCUs give longer battery life in IoT sensor systems
Renesas RE01 MCUs are the newest addition to the RE family of embedded controllers. The new RE01 ultra-low power microcontrollers, based on Renesas’ breakthrough Silicon-On-Thin-Buried-oxide (SOTB™) process technology, are built around the Arm® Cortex®-M0+ processor core.
These new Renesas MCUs feature a Flash memory provision of 256kbytes. RE01 microcontrollers with 1.5Mbytes of Flash are already in mass production. Available in a WLBGA package as small as 3.16mm x 2.88mm, the new 256kbyte RE01 MCUs are intended for use in sensor control in compact IoT devices.
Independent testing verifies the low-power performance of the latest RE01 MCUs. Tested according to the parameters of the EEMBC® ULPMark™-CoreProfile benchmark, the 256kbyte RE01 MCU achieved a high score of 705.
Implementation of Renesas’ proprietary SOTB process technology enables marked reductions in both active and stand-by current: in normal operation, current is as low as 25μA/MHz, and 400nA in stand-by mode. Operating current can be reduced even further, to 12μA/MHz, by using Renesas’ ISL9123, which draws ultra-low quiescent current, as an external step-down regulator.
Despite the new RE01 MCUs’ ultra-low power consumption, these Renesas microcontrollers are capable of high-speed operation in applications which require real-time data processing from multiple sensors, even when powered by small batteries or by energy-harvesting devices. The Cortex-M0+ core can run at a maximum operating frequency of 64MHz, and the RE01 features an on-chip 14-bit ADC for digitizing sensor inputs at high speed and resolution.
Development tools compatible with the RE01 MCUs’ evaluation kit include IAR Embedded Workbench® for Arm, which supports the IAR C/C++ compiler, and e2 studio, which supports the GNU compiler.
Driver software supporting Arm’s Cortex Microcontroller Software Interface Standard (CMSIS) is available. Renesas also supplies low-level sample code for use in low-power applications which cannot permit the power loss caused by the operation of driver software.
The EK-RE01 256 KB evaluation kit’s board includes the ISL9123 DC-DC converter, an Arduino-compatible interface to sensor boards, and a Pmod™ connector for extended evaluation using wireless functionality.