Accurately measure the power consumption of electric appliances with the Mini Power Meter featuring the RL78/L13 low power consumption LCD microcontroller.


The Mini Power Monitor is a power meter that allows a user to accurately measure the power consumption of electric appliances. The mini power monitor uses an RL78/L13 low power consumption LCD MCU, dedicated energy metering chip, high-precision current and voltage sampling circuit, and an LCD to monitor a variety of electrical parameters in electric appliances. The device can measure the total electric energy consumption, active power, voltage, current, total elapsed time, frequency, and CO2 emission values of the attached appliances, record this information via on-chip data flash, and display these parameters via the LCD. To prevent fires, an alarm will go off when the ambient temperature is higher than 60 °C. The device can be used for home appliances such as LED lamps, air conditioners, refrigerators, microwave ovens, etc. It can also be used as a measuring instrument in teaching.

Product Details

  • Minimum instruction execution time: Can be changed from high speed (0.04167μs at 24MHz operation with high-speed on-chip oscillator) to ultra-low speed (30.5μs at 32.768kHz operation with subsystem clock)
  • General-purpose registers: (8-bit register × 8) × 4 banks
  • ROM: 128KB, RAM: 8KB
  • Selectable high-speed on-chip oscillator clock: 48/24/16/12/8/6/4/3/2/1 MHz (TYP.)
  • On-chip single power supply flash memory
  • On-chip debug function
  • On-chip power-on-reset (POR) circuit
  • On-chip watchdog timer (operable with the dedicated low-speed on-chip oscillator)
  • On-chip key interrupt function
  • On-chip clock output/buzzer output controller
  • On-chip BCD (binary-coded decimal) correction circuit
  • I/O port: 65 (N-ch open drain I/O [withstand voltage of 6V]: 2, N-ch open drain I/O [VDD withstand voltage]: 18)
  • Timer
    • 16-bit timer: 8 channels (with remote control output function)
    • 16-bit timer KB20 (IH): 1 channel (IH-only PWM output function)
    • 12-bit interval timer: 1 channel
    • Real-time clock 2: 1 channel (calendar for 99 years, alarm function, and clock correction function)
  • Serial interface
    • CSI: 2 channels
    • UART/UART (LIN-bus supported): 4 channels/1 channel
    • Simplified I2C communication: 2 channels
    • I2C communication: 1 channel
  • 8/10-bit resolution A/D converter: 12 channels
  • Comparator: 2 channels
  • LCD controller/driver: 51 segment signal output pins, 8 common signal output pins
  • Direct Memory Access (DMA) controller: 4 channels
  • Standby function: HALT mode, STOP mode, SNOOZE mode
  • Power supply voltage: VDD = 1.6V to 5.5V
  • Operating ambient temperature: TA = -40 °C to +85 °C

Mini Power Monitor

Related Information


瑞萨电子展示采用 RL78/L13 微控制器的微型电源监控器快速解决方案。
瑞萨电子展示采用 RL78/L13 微控制器的微型电源监控器快速解决方案。
瑞萨电子展示采用 RL78/L13 微控制器的微型电源监控器快速解决方案。

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.