RX140 电容式触摸评估系统

AI 生成的摘要: The CTSU module enables capacitive touch measurements across various RX Family MCUs, supporting multiple CTSU peripheral versions with distinct functions. It facilitates touch sensing through software or external triggers, provides sensor CCO correction for accurate readings, and includes initial offset adjustment to compensate parasitic capacitance. The module supports multi-frequency measurements to reduce noise and offers advanced features such as shield functions, diagnosis, and automatic corrections. APIs allow control over measurement start, data retrieval, and calibration. The document details measurement modes, timing, and integration with firmware, enabling precise capacitive touch applications in embedded systems.

AI 生成的摘要: Capacitive touch sensors measure capacitance changes caused by finger contact using a sensor drive pulse and current measurement. Ripple noise from the power supply or peripheral circuits distorts these measurements by adding noise currents, causing inaccurate touch detection. To ensure high accuracy and reliability, power supply design must minimize ripple noise. The document explains measurement principles, ripple noise effects, and countermeasures including power supply circuit selection, switching circuits, board layout, and touch parameter tuning. It covers RX, RL78, and RA family MCUs embedding CTSU1 and CTSU2 types of capacitive touch sensing units.

AI 生成的摘要: The guide explains methods to enhance noise immunity for capacitive touch sensor MCUs by addressing environmental noise issues that affect capacitance measurements. It covers noise types such as radiated RF, conducted noise, electrostatic discharge (ESD), and electrical fast transients (EFT), referencing IEC 61000-4 standards. The document details hardware and software countermeasures, including board design, multi-frequency measurement, filtering techniques, and protection circuits. It targets RX, RA, RL78 MCU families and Renesas Synergy devices embedding the CTSU module, providing practical design guidelines and evaluation results to ensure stable capacitive touch operation under noisy conditions.

AI 生成的摘要: This document explains how to develop capacitive touch applications using Renesas RX microcontrollers with QE and FIT modules. It guides through project creation in e² studio IDE, using Smart Configurator and QE for Capacitive Touch plug-in to create, tune, and monitor touch sensing. It lists required tools including RX140 evaluation board, Renesas compilers, emulators, and software modules. The document details high-level integration steps and provides an example application workflow for touch detection.

AI 生成的摘要: The self-capacitance waterproof touch button demo software implements an active shield function to enhance noise immunity and water resistance in capacitive touch buttons. It addresses false detections caused by water droplets on electrodes by driving the shield pattern at the same potential as the electrode, canceling parasitic capacitance. The demo uses RX140 devices and compares conventional GND shield buttons with CTSU2 active shield buttons. It includes software control for LED indicators and detailed operational insights, including waveform behavior when water contacts the buttons.

AI 生成的摘要: The Smart Wakeup Solution software enables low power standby on the RX140 capacitive touch evaluation system by utilizing the CTSU2SL module's automatic judgment and multi-electrode connection functions. It measures multiple electrodes simultaneously to reduce power consumption and shortens measurement time. The system wakes up from standby mode upon detecting touch input on any of the 12 connected electrodes, triggering normal operation with LED feedback. The software integrates modules such as LPC, DTC, LPT, and ELC to manage low power transitions and touch measurements at 100 ms intervals without CPU activation unless a touch is detected. The document details software structure, operation environment, capacitive touch settings, and power consumption measurement methods.