Ultra-Low-Power MCUs Offer Robust Security

April 21, 2025
Renesas’s latest ultra-low-power RA4L1 MCUs offer capacitive touch with robust security for metering, IoT sensing, smart locks, and HMI applications

Renesas Electronics recently introduced the RA4L1 microcontroller (MCU) group, with 14 new devices offering ultra-low power consumption, advanced security, and segment LCD support. Leveraging the 80-MHz Arm Cortex M33 processor with TrustZone support, the MCUs deliver a combination of performance and power savings that enable designers to address myriad applications, including water meters, smart locks, IoT sensors, and others. 

Features include proprietary low-power technology that delivers 168 µA/MHz active mode at 80 MHz with a standby current of 1.70 µA while retaining all of the SRAM. The MCUs are also available in very small packages such as a 3.64- × 4.28-mm wafer-level chip-scale package (WLCSP), which meet the needs of products such as portable printers, digital cameras, and smart labels. 

Renesas’s Flexible Software Package (FSP) accelerates application development by providing all required the infrastructure software, including multiple RTOS, BSP, peripheral drivers, middleware, connectivity, networking, and TrustZone support, as well as reference software for AI, motor control, and cloud solutions.

Users can integrate their own legacy code and choice of RTOS with FSP, thus providing full flexibility in application development. The FSP eases migration of existing IP to and from either RA6 or RA2 Series devices. 

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About the Author

Alix Paultre | Editor-at-Large, Electronic Design

An Army veteran, Alix Paultre was a signals intelligence soldier on the East/West German border in the early ‘80s, and eventually wound up helping launch and run a publication on consumer electronics for the US military stationed in Europe. Alix first began in this industry in 1998 at Electronic Products magazine, and since then has worked for a variety of publications in the embedded electronic engineering space. Alix currently lives in Wiesbaden, Germany.

Also check out his YouTube watch-collecting channel, Talking Timepieces

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