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Renesas Electronics Corporation

Smart Toilet

Overview

Description

Smart toilets are a rapidly emerging market, with market share increasing worldwide. This design demonstrates a high‑end product featuring key functions such as seat, water, and drying cooling and heating systems, along with a sterilization function, all controlled via a remote. At its core, a 32‑bit MCU serves as a single‑chip solution for bi-directional human machine interface (HMI) and peripheral device management. The remote control utilizes a Bluetooth® Low Energy (LE) SoC to provide an ultra‑compact, low‑power wireless interface connected to the button controls. The design incorporates DC/DC converters and LDOs to power the MCU, motor, and peripheral modules.

System Benefits:

  • Single‑chip MCU reduces BOM cost and PCB size.
  • Bluetooth LE SoC enables a compact, low‑power remote design.
  • High‑performance DC/DC converters and LDOs enable precise power management.
  • Photocoupler provides high‑performance signal isolation and control.

Comparison

Applications

Block Diagram

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CN050 v4Sheet.206Sheet.1Sheet.2Sheet.3Sheet.4CN050cn050CN050Water ValveWater ValveWater ValveAir PumpAir PumpAir PumpDry MotorDry MotorDry MotorDeodorization MotorDeodorization MotorDeodorization MotorReversing Valve MotorReversing Valve MotorReversing Valve MotorFlash MotorFlash MotorFlash MotorCover Control MotorCover Control MotorCover Control MotorSolenoid or Relay x7Solenoid or Relay x7Solenoid or Relay x7Temperature SensorTemperature SensorTemperature SensorWi-Fi 6/Bluetooth LE ModuleWi-Fi 6/ Bluetooth LE ModuleWi-Fi 6/Bluetooth LE ModuleTriac x6Triac x6Triac x6Seat cooling, Seat heating, Water heating, Dry heatingSeat cooling Seat heating Water heating Dry heating· Seat cooling· Seat heating· Water heating· Dry heatingSterilization ModuleSterilization Module Electrolytic water UltravioletSterilization Module· Electrolytic water· UltravioletButton ControlButton ControlButton ControlNon-Renesas Component.39Touch KeySheet.69Sheet.70Sheet.71Sheet.72Sheet.73Sheet.74Sheet.75Sheet.76Sheet.77LCD/LED Segment DisplaySheet.93Sheet.94Sheet.95Sheet.96Sheet.97Sheet.98Sheet.99Sheet.100Sheet.101Sheet.102Sheet.103Sheet.104Sheet.105Sheet.106Sheet.107Sheet.108Sheet.109Sheet.110Sheet.111Sheet.112Sheet.113Sheet.114Sheet.115Sheet.116Sheet.117Sheet.118Sheet.119Sheet.120Sheet.121Sheet.122ONONSheet.123OFFOFFSheet.124Sheet.125Sheet.126Sheet.127Sheet.128Sheet.129Sheet.130Sheet.131LCD/LED Segment Display.132Sheet.133Sheet.134Sheet.135Sheet.136Sheet.137Sheet.138Sheet.139Sheet.140Sheet.141Sheet.142Sheet.143Sheet.144Sheet.145Sheet.146Sheet.147Sheet.148Sheet.149Sheet.150Sheet.151Sheet.152Sheet.153Sheet.154Sheet.155Sheet.156Sheet.157Sheet.158Sheet.159Sheet.160Sheet.161Sheet.162ONONSheet.163OFFOFFSheet.164Sheet.165Sheet.166Sheet.167Sheet.168Sheet.169Sheet.170Sheet.171Battery 2-CellSheet.173Sheet.174Sheet.175Sheet.176Line 1pt.1552Line 1pt.1608Ground (earth)Sheet.187Sheet.188Sheet.189Sheet.190Sheet.193Sheet.194Sheet.195Sheet.196Sheet.197Sheet.198Sheet.199Sheet.200Sheet.201Sheet.204Sheet.207Sheet.213Sheet.214Sheet.216Connector 1.166.2173.3V3.3V3.3VSheet.229Sheet.221Sheet.222Sheet.223Sheet.224Sheet.225Darlington.651Sheet.227Darlington.254To motor, valve, pumpTo motor, valve, pumpTo motor, valve, pumpSheet.231Sheet.232Sheet.233Sheet.234Sheet.235Connector 1.166.23612V12V12VSheet.238 3.3V3.3V3.3VSheet.240Sheet.241Sheet.242Sheet.243Sheet.244Sheet.245Sheet.246 3.7V3.7V3.7VTouch KeyTouch KeyTouch KeyLCDLCDLCDSheet.250Sheet.251 LCDLCDLCDSheet.254Non-Renesas Component.40Diode - LED.50Sheet.51Sheet.52Sheet.53Sheet.54Sheet.55Darlington.651Sheet.57Darlington.254Sheet.256 3.7V3.7V3.7VSheet.259 3V3V3VAAA Battery x2AAA Battery x2AAA Battery x2Connector 1.166.262Wi-FiBi-directional.268Connector 1.166Connector 1.166.273Connector 1.166.274Connector 1.166.275AntennaSheet.277Sheet.278Sheet.279Sheet.280Sheet.281Sheet.282AUX PowerAUX PowerAUX PowerBuck RegulatorBuck RegulatorBuck RegulatorLDOLDOLDOSheet.289Bluetooth LE SoCBluetooth LE SoCBluetooth LE SoCPHYPHYPHY GPIOGPIOGPIO GPIOGPIOGPIO I2CI2CI2CSheet.290MCUMCUMCUI2CI2CI2CGPIOGPIOGPIOIrDAIrDAIrDATimerTimerTimer GPIOGPIOGPIOCTSUCTSUCTSU LDCCLDCCLDCCUARTUARTUARTCircleCircle.270Photocoupler x6Photocoupler x6Photocoupler x6
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