Renesas RX113 MCUs offer ultra-low power and advanced touch sensitivity for IoT apps -

Renesas RX113 MCUs offer ultra-low power and advanced touch sensitivity for IoT apps


Renesas Electronics Corporation's new RX113 Group of microcontrollers (MCUs) is expanding the use of touch panel displays in healthcare, building automation and home appliance applications.

Part of the RX100 Series, the new MCUs offer a single-chip solution with unique touch sensor IP and low-power technologies. This enables significantly reduced power, size, and development costs for entry-level devices in these markets, as well as for other cost-sensitive, capacitive touch-based applications for the growing Internet of Things (IoT) market. Renesas' touch sensor intellectual property (IP) core achieves both high noise immunity and high sensitivity, offering touch key operation on wet and curved touch panels.

Based on Renesas' RX CPU core, the RX113 Group of MCUs delivers the highest performance, lowest power, advanced connectivity, and extensive digital signal processing (DSP) capability compared to other entry-level 32-bit MCUs. In addition to a capacitive-touch sensing unit and unprecedented ultra-low power, these full-featured 32-bit MCUs also support LCD control, USB 2.0, audio and more. The RX113 devices support multiple memory configurations and communications peripherals to keep pace with expanding embedded systems design requirements, including:

  • Up to 512 KB of flash memory and 64 KB of SRAM
  • Segment LCD control/drive capability up to 288 segments for support of the latest system displays
  • I2S for audio processing, SSI (Serial Sound Interface) and SPI (serial peripheral interface) protocols
  • 12-bit ADC (analog-to-digital converter) with internal voltage reference, and a 12-bit DAC (digital-to-analog converter) and a temperature sensor
  • Complete DSP Processing capability, including Hardware-based Divide, for efficient near-sensor processing

The RX113 MCUs support both mutual- and self-capacitance methods for key manipulation detection. The Capacitive Touch sensing unit supports up to 36 channels of key input (in mutual-capacitance mode). The self-capacitance method provides significantly improved noise immunity and sensitivity compared to previous implementations. The new MCUs also support Renesas Electronics' first mutual-capacitance method, which allows touch key operation even when the user is wearing gloves and is highly resistant to incorrect detection even when there is water on the touch key area itself. The Capacitive Touch sensing unit supports acrylic panels over 10 mm thick, which allows for flexible designs, such as those using curved panels, to be implemented. Renesas has improved the sensitivity by approximately 5 times, enabling user interfaces with non-traditional surfaces (e.g., wet panels or gloves) to be implemented.

According to Renesas, the 32-bit RX113 MCUs achieve the industry's highest level of power efficiency, featuring operating mode power consumption as low as 0.1 mA/MHz (typical) and only 0.44 µA power consumption in low-power mode (RAM contents retained). They also achieve power consumption as low as 1.6 µA in LCD drive mode (internal step-up and 1/3 bias operation).

Samples of the RX113 MCUs are available in package pin counts ranging from 64 to 100 pins and on-chip flash memory capacities ranging from 128 to 512 kilobytes (KB) for a total of twelve individual products. The MCUs are currently in mass production. Pricing varies depending on memory capacity, package and number of pins.

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