Overview
Description
This reference design introduces a home appliance panel UI demo based on the RL78/G22 and its capacitive touch sensing unit (CTSU2La), designed to evaluate low-power capacitive touch interfaces. The demo uses the Multiple Electrode Connection (MEC) function to treat multiple touch electrodes as a single input, enabling efficient standby wake-up detection with fewer scans and reduced power consumption. By adjusting sensitivity, the same approach also supports proximity-style sensing, making it suitable for early-stage UI concept evaluation and design studies.
Features
- Uses the RL78/G22 MCU
- Uses the RL78/G22 CPU board included in the RSSK-RL78G22, and an electrode board that has 7 self-capacitive buttons and 25 LEDs
- The front panel works as a touch button and touchless sensor using the same electrode
- MEC function allows sensing of multiple electrodes by single measurement
- Low power consumption by MEC function
Applications
Documentation
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| Type | Title | Date |
| PCB Design Files | Capacitive Touch Appliance UI Reference Design Files
Design files for the capacitive touch appliance UI reference design include the schematic, BOM, PCB layout files, and Gerber artwork—essential tools for enabling complete evaluation of IC and board functions.
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| Manual - Development Tools |
PDF
923 KB
日本語
Offers excellent touch UI in both functionality and design through high‑sensitivity capacitive touch sensing and low-power operation.
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| Application Note |
PDF
3.72 MB
日本語
AI-generated Summary:
The document explains the Multiple Electrode Connection (MEC) function that treats multiple touch electrodes as a single electrode to reduce scanning time and power consumption. It demonstrates a home appliance UI with seven touch buttons, which operate independently in normal mode and combine into one electrode in standby mode using MEC. This allows waking the device from standby by touching any electrode. The document includes hardware configuration, sample software flowcharts, current consumption measurements, and design files such as schematics and BOM for the electrode board.
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Design & Development
Software & Tools
Software & Tools
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Software type
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Company
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| QE for Capacitive Touch: Development Assistance Tool for Capacitive Touch Sensors In developing embedded system using the capacitive touch sensor of MCUs, you can easily setup initial configurations of the touch interface as well as process the tuning of sensors, and reduce development time. [Plugin for Renesas IDE "e2 studio"] [Standalone Version] [Support MCU/MPU:RA, RL78, RX, Renesas Synergy™]
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Solution Toolkit | Renesas |
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Sample Code
Related Boards & Kits
Boards & Kits
Capacitive Touch Evaluation System for RL78/G22
The RL78/G22 capacitive touch evaluation system makes it easy for users to evaluate touch solutions offered by Renesas. You can start evaluating immediately out of the box using the board and software included in each kit.
Configuration
- RL78/G22 CPU board
- Touch application...
Videos & Training
We will show an appliance UI demo using Capacitive Touch of RL78/G22.
The Capacitive Touch of RL78/G22, with high sensitivity and high noise immunity, enables well-designed user interface with good functionality and can be achieved with ultra-low current consumption.
Additional Videos
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