Renesas Adds Capacitive Touch to Ultra-Low-Power RA0 MCUs

By: Renesas Electronics Corporation via Business Wire

September 17, 2025 at 08:00 AM EDT

Low-Cost RA0L1 Devices Target Consumer Electronics, Small Appliances and Industrial System Control

Renesas Electronics Corporation (TSE:6723), a premier supplier of advanced semiconductor solutions, today introduced the RA0L1 microcontroller (MCU) Group based on the Arm^® Cortex^®-M23 processor. The new devices offer extremely low power consumption and the industry’s best solution for quickly and economically implementing capacitive touch in battery-powered and other consumer electronics, appliances, white goods and industrial system controls.

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Renesas introduced the RA0 MCU series in 2024 and it has quickly become very popular with a wide range of customers due to its affordability and low power consumption. With the addition of capacitive touch functionality, RA0L1 devices offer designers the ability to create responsive, attractive, low-power user interfaces at very low cost.

RA0L1 MCUs deliver industry-leading power consumption of only 2.9mA current in active mode, and 0.92mA in sleep mode. In addition, an integrated High-speed On-Chip Oscillator (HOCO) enables the fastest wake-up time for this class of microcontroller. The fast wake-up enables the RA0L1 MCUs to stay in Software Standby mode more of the time, where power consumption drops to a minuscule 0.25 µA. With this feature, current consumption can be reduced by up to 90 percent compared with other solutions.

Feature Set Optimized for Low Cost

The RA0L1 devices have a feature set optimized for cost-sensitive applications. They offer a wide operating voltage range of 1.6V to 5.5V so customers don’t need a level shifter/regulator in 5V systems. The RA0L1 MCUs also integrate multiple communications interfaces, analog functions, safety functions and security functionality to reduce customer BOM cost. A wide range of packaging options is also available, including a tiny 4mm x 4mm 24-pin QFN.

In addition, the new MCU’s high-precision (±1.0%) HOCO improves baud rate accuracy and enables designers to forego a standalone oscillator. Unlike other HOCOs in the industry, it maintains this precision in environments from -40°C to 125°C. This wide temperature range enables customers to simplify thermal design by avoiding costly and time-consuming “trimming,” even after the reflow process.

Renesas Capacitive Touch Leadership

Renesas provides industry-leading capacitive touch technology, ensuring customers can quickly and cost-effectively implement high-quality touch interfaces in a variety of systems. Its self-capacitance method simplifies waterproof design, offering simpler design and reduced complexity compared to mutual capacitance solutions. Renesas’ multi-frequency measurement meets IEC61000 4-3 Level 4 standards, making it ideal for medical applications that demand robust protection from electromagnetic interference. Renesas also offers specialized development resources for capacitive touch, including the QE for Capacitive Touch that streamlines sensitivity adjustments for capacitive touch buttons, speeding up development.

“The RA0L1 combines the industry-leading power consumption and cost-effectiveness of our RA0 Series MCUs with our unmatched capacitive touch technology and tools,” said Daryl Khoo, Vice President of the Embedded Processing Marketing Division at Renesas. “We look forward to the many innovative touch interface solutions that our customers will create using these devices.”

Key Features of the RA0L1 Group MCUs

Core: 32MHz Arm Cortex-M23
Memory: Up to 64KB integrated Code Flash memory and 16KB SRAM
Extended Temperature Range: Ta -40°C to 125°C
Timers: Timer array unit (16b x 8 channels), 32-bit interval timer (8b x 4 channels), RTC
Communications Peripherals: 3 UARTs, 2 Async UART, 6 Simplified SPIs, 2 I²C, 6 Simplified I²Cs
Analog Peripherals: 12-bit ADC, temperature sensor, internal reference voltage
HMI: Capacitive Touch (up to 24 channels), Controlled Current Drive Port (up to 8)
Safety: SRAM parity check, invalid memory access detection, frequency detection, A/D test, output level detection, CRC calculator, register write protection
Security: Unique ID, TRNG, Flash access window, Flash read protection
Packages: 24-, 32- and 48-pin QFNs, 32-, 48-pin LQFP, 20-pin LSSOP

The new RA0L1 Group MCUs are supported by Renesas’ Flexible Software Package (FSP). The FSP enables faster application development by providing all the infrastructure software needed, including multiple RTOS, BSP, peripheral drivers, middleware, connectivity, networking, and security stacks as well as reference software to build complex AI, motor control and cloud solutions. It allows customers to integrate their own legacy code and choice of RTOS with FSP, thus providing full flexibility in application development. Using the FSP will ease migration to and from other RA family devices.

Winning Combinations

Renesas has combined the new RA0L1 Group MCUs with numerous compatible devices from its portfolio to offer a wide array of Winning Combinations, including the Capacitive Touch Remote Controller. Winning Combinations are technically vetted system architectures from mutually compatible devices that work together seamlessly to bring an optimized, low-risk design for faster time to market. Renesas offers more than 400 Winning Combinations with a wide range of products from the Renesas portfolio to enable customers to speed up the design process and bring their products to market more quickly. They can be found at renesas.com/win.

Availability

The RA0L1 Group MCUs are available now, along with the FSP software, the RA0L1 Fast Prototyping Board and the RA0L1 Renesas Solution Starter Kit for Cap Touch. Samples and kits can be ordered either on the Renesas website or through distributors. More information on the new MCUs is available at renesas.com/RA0L1.

Renesas MCU Leadership

The world leader in MCUs, Renesas ships more than 3.5 billion units per year, with approximately 50% of shipments serving the automotive industry, and the remainder supporting industrial and Internet of Things applications as well as data center and communications infrastructure. Renesas has the broadest portfolio of 8-, 16- and 32-bit devices, delivering unmatched quality and efficiency with exceptional performance. As a trusted supplier, Renesas has decades of experience designing smart, secure MCUs, backed by a dual-source production model, the industry’s most advanced MCU process technology and a vast network of more than 250 ecosystem partners. For more information about Renesas MCUs, visit renesas.com/MCUs.

About Renesas Electronics Corporation

Renesas Electronics Corporation (TSE: 6723) empowers a safer, smarter and more sustainable future where technology helps make our lives easier. The leading global provider of microcontrollers, Renesas combines our expertise in embedded processing, analog, power and connectivity to deliver complete semiconductor solutions. These Winning Combinations accelerate time to market for automotive, industrial, infrastructure and IoT applications, enabling billions of connected, intelligent devices that enhance the way people work and live. Learn more at renesas.com. Follow us on LinkedIn, Facebook, X, YouTube and Instagram

(Remarks). All names of products or services mentioned in this press release are trademarks or registered trademarks of their respective owners.

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Don Parkman

Renesas Electronics Corporation

+ 1-408-887-4308

don.parkman.xh@renesas.com

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Renesas Adds Capacitive Touch to Ultra-Low-Power RA0 MCUs

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