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Touchless Button

Overview

Description

A touchless button solution can be widely used in homes (lighting switches, bathroom switches, etc.) and public locations (vending machines, electric door openers, etc.). A touch can be detected without directly touching the button; therefore, the adhesion of bacteria and dirt to the fingers is reduced. The touchless button solution lessens concerns over contaminated surfaces.

Renesas offers a reference design for the touchless button solution. To learn more, see the Touchless Button Reference Design page.

System Benefits​:

  • Entry-level RA 32-bit MCU with a Capacitive Touch Sensor Unit 2 (CTSU2) provides touchless control with high sensitivity and high noise immunity. All Renesas MCUs that contain a CTSU are also compatible.
  • Ultra-low Iq buck-boost can fully extract the power of a battery as low as 1.8V.
  • Output voltage can be adjusted by the I2C bus.

Comparison

Applications

Block Diagram

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Template 1Connector Arrow.218Optional Non-Renesas ComponentOptionOptionConnector Arrow.183DiodeSheet.65Sheet.66Sheet.67Connector Arrow.37Touch KeySheet.39Sheet.40Sheet.41Sheet.42Sheet.43Sheet.44Sheet.45Sheet.46Sheet.47Touch Key.48Touch KeyTouch KeyCN318CN318CN318AC LineAC LineAC LinePlugSheet.169Sheet.170Sheet.171Sheet.172AC Power Source.172Sheet.174Alternating CurrentLED DriverLED DriverLED DriverConnector Arrow.180Sheet.182LED Segment DisplaySheet.124Sheet.125Sheet.126Sheet.127Sheet.128Sheet.129Sheet.130Sheet.131Sheet.132Sheet.133Sheet.134Sheet.135Sheet.136Sheet.137Sheet.138Sheet.139Sheet.140Sheet.141Sheet.142Sheet.143Sheet.144Sheet.145Sheet.146Sheet.147Sheet.148Sheet.149Sheet.150Sheet.151Sheet.152Sheet.153ONONSheet.154OFFOFFSheet.155Sheet.156Sheet.157Sheet.158Sheet.159Sheet.160Sheet.161Sheet.162LEDLEDLEDConnector Arrow3.3V3.3V3.3VRS-485/422RS-485/422RS-485/422Bi-directionalBi-directional.189RS-485RS-485RS-485Buck-BoostBuck-BoostBuck-BoostBuck-BoostVINVINVINVOUTVOUTVOUTI2C.197I2CI2CConnector Arrow.199Isolated AC/DCIsolated AC/DCIsolated AC/DCConnector Arrow.203Connector Arrow.204Battery 2-CellSheet.206Sheet.207Sheet.208Sheet.209Line 1pt.1552Line 1pt.1608Ground (earth)Sheet.213Sheet.214Sheet.215Sheet.216Bi-directional.219Connector 1.1603.3V.2213.3V3.3VBi-directional.223MCUMCUMCUMCUUARTUARTUARTCTSUCTSUCTSUPWMGPIOGPIOI2CI2CI2CADC 212-bit ADC12-bit ADC
Exiting Interactive Block Diagram

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