Notify a remote receiver when a doorbell is pressed using the Wireless Doorbell solution featuring the Renesas RL78/G11 low pin and internally configurable analog microcontroller (MCU), RL78/G1H low power sub-GHz wireless communication MCU, and ISL80505 single-output low-dropout regulator.


The Wireless Doorbell application uses sub-GHz wireless communication to notify a remote receiver when the doorbell is pressed. The transmitter and receiver both have a built-in RL78/G1H sub-GHz wireless communication module, RL78/G11 for control. When the transmitter button is pressed, its LED lights up and wireless communication starts. When the receiver receives a signal from the transmitter, its LED starts blinking and the speaker emits sounds. The wireless doorbell is suitable for use in the home or office.

The ISL80505 single-output low-dropout regulator (LDO) is used for receiver power management. The ISL80505 can supply up to 500mA output current at input from 1.8V to 6V, providing extremely stable voltage.

Product Details

  • Minimum instruction execution time: Can be changed from high speed (0.04167μs at 24MHz operation with highspeed on-chip oscillator) to low speed (66.6μs at 15kHz operation)
  • General-purpose registers: 8-bit register × 8
  • ROM: 16KB, RAM: 1.5KB, data flash: 2KB
  • Selectable high-speed on-chip oscillator clock: 48/24/16/12/8/6/4/3/2/1 MHz (TYP.)
  • Selectable middle-speed on-chip oscillator clock: 4/2/1 MHz (TYP.)
  • On-chip debug function
  • On-chip selectable power-on-reset (POR) circuit
  • On-chip voltage detector (LVD)
  • On-chip watchdog timer (operable with the dedicated low-speed on-chip oscillator)
  • On-chip key interrupt function: 6 key interrupt input pins
  • On-chip clock output/buzzer output controller
  • On-chip BCD (binary-coded decimal) correction circuit
  • I/O port: 17 to 21
  • Timer
    • 8/16-bit timer: 4 channels
    • 12-bit interval timer: 1 channel
    • TKB: 1 channel
  • Serial interface
    • CSI: 4 channels
    • UART: 2 channels
    • Simplified I2C communication: 4 channels
    • Multi-master I2C communication: 2 channels
  • 8/10-bit resolution A/D converter: 10 channels
  • 8/10-bit resolution D/A converter: 2 channels
  • Comparator: 2 channels
  • PGA: 1 channel
  • Data transfer controller (DTC)
  • Event link controller (ELC)
  • Standby function: HALT or STOP mode
  • Power supply voltage: VDD = 1.8V to 5.5V
  • Operating ambient temperature: TA = -40 °C to +85 °C

Wireless Doorbell Transmitter

Wireless Doorbell Transmitter

Wireless Doorbell Receiver

Wireless Doorbell Receiver

Related Information


瑞萨电子展示采用 RL78/G11 微控制器的无线门铃快速解决方案。
瑞萨电子展示采用 RL78/G11 微控制器的无线门铃快速解决方案。
瑞萨电子展示采用 RL78/G11 微控制器的无线门铃快速解决方案。

Disclaimer: THIS MATERIAL IS PROVIDED “AS-IS” FOR EVALUATION PURPOSES ONLY. RENESAS ELECTRONICS CORPORATION AND ITS SUBSIDIARIES (collectively, “Renesas”) DISCLAIM ALL WARRANTIES, INCLUDING WITHOUT LIMITATION, FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY. Renesas provides evaluation platforms and design proposals to help our customers to develop products. However, factors beyond Renesas' control, including without limitation, component variations, temperature changes and PCB layout, could significantly affect the product performance. It is the user’s responsibility to verify the actual circuit performance.