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100MHz Low-Power MCUs Target IoT Designs

Renesas Electronics has expanded its RA4 Series microcontrollers (MCUs) with the new 32-bit RA4M3 Group of MCUs. The RA4M3 MCUs boost operating performance up to 100 MHz using the Arm Cortex-M33 core based on Armv8-M architecture. The RA4M3 Group makes it easy to develop safe and secure IoT edge devices for low-power applications, such as security, metering, industrial and HVAC applications, says Renesas.

The RA4M3 Group is designed for low-power IoT applications that require a balance of high performance, strong security, and higher memory. The RA4M3 MCUs combine TrustZone technology with Renesas’ enhanced Secure Crypto Engine, enabling customers to realize secure element functionality in a wide variety of IoT designs. The Secure Crypto Engine incorporates multiple symmetric and asymmetric cryptography accelerators, advanced key management, security lifecycle management, power analysis resistance and tamper detection.

The RA4M3 MCUs drive power consumption down to 119uA/MHz in active mode running CoreMark from flash memory and 1.6mA in standby mode with standby wakeup times as fast as 30 µs – a critical element for IoT applications operating in the field for extended periods. For memory-intense applications, designers can combine Quad-SPI and SD-card interfaces with the MCUs’ built-in embedded memory to increase capacity.

The background operation and Flash Bank SWAP option is ideal for memory optimized firmware updates running in the background. The increased embedded RAM with parity/ECC also makes the RA4M3 MCUs ideal for safety-critical applications. The RA4M3 MCUs also feature several integrated features to lower BOM costs, including capacitive touch sensing, embedded flash memory densities up to 1MB, and analog, communications, and memory peripherals.

Key Features of the RA4M3 Group

  • 100 MHz Arm Cortex-M33 with TrustZone technology on a 40nm process
  • Integrated 1 MB flash memory, 128 KB RAM, 8 KB Data Flash and 1 KB stand-by SRAM
  • Low power consumption delivering an operating current of 119 μA/MHz in active mode and 1.6 mA standby current with 30 µs wakeup time
  • Background operation and Block SWAP function for the flash memory
  • Capacitive touch sensing unit
  • Multiple interfaces including Quad SPI and SDHI memory interfaces, SSI, USB2.0 Full Speed, SCI and SPI/I2C
  • Scalable from 64-pin to 144-pin LQFP packages (including LGA- and BGA-ready options)

Together, the RA4M3 Group with Flexible Software Package (FSP) allows embedded developers to re-use their legacy code and combine it with software from partners across the vast Arm ecosystem and the RA partner ecosystem to speed implementation of complex connectivity and security functions. The FSP includes FreeRTOS and middleware, offering a premium device-to-cloud option for developers. These out-of-box options can be easily replaced and expanded with any other RTOS or middleware.

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The FSP provides a host of efficiency enhancing tools for developing projects targeting the RA4M3 MCUs. The e2 studio Integrated Development Environment provides a familiar development cockpit from which the key steps of project creation, module selection and configuration, code development, code generation and debugging are all managed. The FSP uses a GUI to simplify the process and dramatically accelerate the development process.

Renesas Electronics | www.renesas.com


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100MHz Low-Power MCUs Target IoT Designs

by Circuit Cellar Staff time to read: 2 min