Renesas Electronics Corporation recently introduced the ultra-low power, 32-bit RX140 group of microcontrollers (MCUs), the latest addition to its entry-level RX100 Series. Built around Renesas’ powerful RXv2 CPU core, the RX140 MCUs deliver outstanding performance, with operation of up to 48 MHz with a CoreMark score of 204, equivalent to approximately twice the processing performance of the RX130 group. The RX140 MCUs also boost power efficiency by over 30 percent compared with previous RX130 MCUs, achieving power consumption as low as 56 µA/MHz when the CPU is in active mode and as low as 0.25 µA in standby mode. This enables the RX140 MCUs to realize high performance and low power consumption in a wide range of products, such as home appliances, industrial and building automation (BA).

The RX140 MCUs feature the latest capacitive touch sensing units, offering customers an enhanced user experience (UX) and user interface (UI). The MCUs fulfill the IEC EN61000-4-3 level 4 (radiated) and EN61000-4-6 level 3 (conducted) capacitive touch noise tolerance requirements. This proves they are less susceptible to electromagnetic noise, allowing the MCUs to detect changes in water level by directly measuring changes in capacitance through high-precision sensing. Built-in multi-scan functionality and automated sensing enable customers to improve sensitivity through simultaneous measurement using multiple electrodes. This allows for automatic touch detection even in standby mode, making it easier for customers to develop interfaces quickly and easily utilizing touchless operation or proximity sensing. As part of Renesas’ RX capacitive touch MCU lineup, the RX140 MCUs allow customers to develop reliable, high-end capacitive touch systems for applications in a variety of environments. These include home appliances such as microwave ovens, refrigerators, and induction heat cooking stoves, as well as manufacturing equipment, building control panels, and devices that can detect remaining quantities of water or powder on surfaces.

“The RX100 Series of ultra-low power MCUs is gaining popularity for the superior scalability it offers as the entry-level model for the RX Family,” said Sakae Ito, Vice President of the IoT Platform Business Division at Renesas. “With the release of the RX140 MCUs offering improved performance and power efficiency alongside the latest capacitive touch IP, we continue to bring advanced solutions that enable customers to create products that combine enhanced functionality, design, and usability.”

The RX140 MCUs also features improved peripheral functions. For example, the number of I/O ports has been increased to allow control of more sensors or external components, and CAN communication support for real-time operation has been added. A built-in AES encryption accelerator and true random number generator (TRNG) reduce the risks of security threats such as data leakage or manipulation.

Designed for scalability, the new RX140 MCUs also maintain pin compatibility with the RX130, enabling customers to upgrade while continuing to make use of existing design resources.

The RX140 group of MCUs is available now in 32- to 64-pin packages with 64KB of flash memory. Mass production for additional configurations and memory sizes over 128KB will be available starting in February 2022. Pricing will vary based on package and memory configuration. The reference price for the R5F51403ADFM#30 in a 64-pin LFQFP package with 64 KB of flash memory is US $1.02 (excluding tax) in 10,000-unit quantities (Pricing and available subject to change).

To learn more about the new Renesas RX140 MCUs, visit