Low power MCU group for industrial IoT endpoint devices

The MCUs also include general-purpose features that simplify designing cost sensitive, low power Internet of Things (IoT) endpoint devices. The entry-level S5D3 MCUs target a broad range of industrial, building automation, and office equipment, as well as smart metering, and home appliances employing a capacitive touch human-machine interface (HMI). 

The Renesas Synergy Software Package (SSP) supports the S5D3 MCUs with HAL drivers, application frameworks and real-time operating system. Embedded system designers can use either of the Renesas Synergy development environments, e² studio or IAR Embedded Workbench, to build and customise their designs.

Based on a 40nm process, the S5D3 MCUs integrate a secure cryptographic engine (SCE7) with key protection that safeguards the MCU boot code and IoT endpoint device communication with a root of trust. This capability eliminates the need for external security functions and reduces BOM cost. The SCE7 features encryption hardware accelerators like RSA, DSA, AES, ECC, SHA and true random number generator (TRNG) to provide a secure system connection to the cloud.

Each S5D3 MCU offers superior power consumption of 100μA/MHz in active mode, ultra-low 1.3μA in standby mode, and 900nA for a VBATT supply that keeps the integrated real-time clock running, making these devices ideal for applications that require low power and high performance.

The S5D3 MCUs offer 512 KB flash memory and a large 256 KB SRAM memory. This unique 2:1 ratio of embedded flash to SRAM supports intensive communication stacks utilisation for robust IoT connectivity, and the 8 KB data flash enables more read/write cycles than the competition.

Each S5D3 MCU integrates several analog components including two 12-bit analog-to-digital converters (ADCs), a two channel 12-bit digital-to-analog converter (DAC), high-speed six channel comparator, temperature sensor, and a six channel programmable gain amplifier (PGA). The S5D3 MCUs also offer a scalable set of 13 independent 32-bit general-purpose timers, and communications interfaces such as USB, CAN, I2C, SPI, SDHI, and SSI.

“The S5D3 MCUs beat the competition with superior security, memory performance, MCU scalability, and Synergy Platform support,” said Daryl Khoo, Vice President, Product Marketing, IoT Platform Business Division, Renesas Electronics Corporation. “The cost-optimised and pin-compatible S5D3 MCUs are scalable up through the S5D5, S5D9 and S7G2 MCU groups if customers later require additional features, more memory, or higher performance.”