Renesas ultra-low power RA MCU family with touch sensing

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By Ally Winning

The general-purpose RA2L1 MCUs are built around an Arm Cortex-M23 core that runs at up to 48 MHz. RA2L1 MCUs are supported by the Flexible Software Package (FSP). Renesas’ partner ecosystem also helps designers start developing quickly by offering software and hardware building block solutions. The ultra-low-power touch interface of the RA2L1 MCUs make them ideal for home appliance, industrial and building automation, medical and healthcare, and consumer HMI IoT applications.

The ultra-low-power RA2L1 MCUs provide many integrated features to lower BOM costs, including capacitive touch sensing, embedded flash memory densities up to 256 KB, SRAM at 32 KB, analog, communications, and timing peripherals, and safety and security functions. When benchmarked for power consumption, the RA2L1 MCU was certified with an EEMBC ULPMark score of 304 at 1.8V.

“Continuing the rollout of the RA MCU Family, I am pleased to announce the expansion of the general-purpose RA2 Series for HMI IoT applications,” said Roger Wendelken, Senior Vice President of Renesas’ IoT and Infrastructure Business Unit. “The RA2L1 MCUs were designed from the ground-up to optimize for lowest-standby power, employing an advanced power and clock gating feature, and integrate our second-generation capacitive touch sensing unit with advanced and highly differentiated features.”

The capacitive touch IP in the RA2L1 MCUs supports sensing through acrylic or glass panels that are over 10 mm thick. It also provides proximity sensing (hovering) and 3D gestures to be used in applications with hygiene or safety limitations. The RA2L1’s capacitive touch noise tolerance meets the requirements of IEC EN61000-4-3 level 4 (radiated) and EN61000-4-6 level 3 (conducted).

The RA2L1 MCUs also feature an IEC60730 self-test library and integrated safety functions that confirm normal operation. For security, the RA2L1 has an AES cryptography accelerator, true random number generator (TRNG) and memory protection units.

The FSP has a HAL driver and provides a host of efficiency enhancing tools for RA2L1 MCUs. The e2 studio IDE helps with project creation, module selection and configuration, code development, code generation, and debugging. The FSP’s GUI simplifies the process and quickens the development process.

More information

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