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Renesas has unveiled the RA4L1, a 32-bit microcontroller (MCU) based on the Arm Cortex-M33 core, targeting energy-efficient applications with advanced security. Operating at 80 MHz, it balances high performance with ultra-low power consumption, drawing only 168 µA/MHz in active mode and as little as 1.65 µA in standby. Designed for IoT, metering, and industrial applications, the RA4L1 integrates TrustZone security, flexible communication interfaces, and a capacitive touch controller. For more information, visit https://www.renesas.com/ At Embedded World 2025, Renesas demonstrated real-world use cases for the RA4L1, highlighting its role in smart locks, where both low power consumption and security are essential. As cybersecurity regulations tighten, embedded devices require robust protection against unauthorized access. The RA4L1’s dedicated security engine provides a hardware root of trust (RoT), a true random number generator (TRNG), and cryptographic acceleration for AES and ECC, ensuring secure key storage and encrypted communication. These features allow secure OTA updates and identity verification, making it suitable for applications such as hotel locks, where battery life and security are critical concerns. With dual-bank 512 KB flash memory, 64 KB SRAM, and 8 KB data flash, the RA4L1 supports over-the-air firmware updates and fast boot capabilities. Its ability to wake from standby with an NFC trigger at just 1.6 µA ensures efficient power management. The MCU's extensive peripheral integration includes USB 2.0 full-speed, CAN FD, multiple serial interfaces (UART, I²C, I³C, SPI, QSPI), and a segment LCD controller. The combination of hardware-accelerated cryptography and energy efficiency allows seamless deployment in security-focused IoT applications. The RA4L1 also features a capacitive touch sensing unit (CTSU) with up to 12 channels, supporting both mutual and self-capacitance modes. In a demonstration, Renesas showcased how capacitive touch buttons can serve as ultra-low-power wake-up switches, allowing systems to remain in deep sleep until a user initiates contact. These touch sensors, combined with an LCD interface, enable interactive, low-power HMIs for consumer and industrial devices. A key strength of the RA4L1 is its event-driven architecture, which allows peripherals to operate independently of the CPU. The device’s direct memory access controller (DMAC) and data transfer controller (DTC) handle tasks such as sensor data acquisition, serial communication, and ADC triggering without waking the core, significantly reducing power consumption. This makes the MCU ideal for energy-sensitive applications such as water and gas meters, where it can process wheel rotation via an optical sensor without engaging the CPU, thereby extending battery life. Renesas also demonstrated the RA4L1’s suitability for metering applications, where precise and low-power sensing is essential. Using an infrared sensor and integrated timers, the MCU can track a water meter’s wheel rotation, measuring both position and speed without frequent processor intervention. This reduces power usage while maintaining high accuracy in real-time data acquisition. The ability to integrate various sensor inputs and process them in low-power modes makes the RA4L1 a competitive choice for smart metering and industrial monitoring. To streamline development, Renesas provides the Flexible Software Package (FSP), which includes pre-configured drivers, middleware, and security libraries optimized for the RA4L1. Developers can leverage these tools for rapid prototyping, reducing time-to-market for secure embedded systems. The FSP ecosystem supports secure key provisioning, cryptographic operations, and peripheral control, enabling seamless integration with existing IoT platforms. Now in mass production, the RA4L1 is expected to gain strong traction in Europe and other global markets, where Renesas has already seen significant adoption of its previous-generation MCUs. With a well-balanced combination of low power, advanced security, and flexible connectivity, the RA4L1 is positioned as a robust solution for battery-powered industrial, consumer, and IoT applications. Check out all my Embedded World 2025 videos in this playlist: • Embedded World This video was filmed using the DJI Pocket 3 ($669 at https://amzn.to/4aMpKIC using the dual wireless DJI Mic 2 microphones with the DJI lapel microphone https://amzn.to/3XIj3l8 ), watch all my DJI Pocket 3 videos here • Filmed with DJI Pocket 3 Join https://www.youtube.com/charbax/join for Early Access to my videos and to support my work, or you can Click the "Super Thanks" button below the video to send a highlighted comment!