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.

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.


  • Demo board includes the RL78/L13 MCU
  • Monitor a variety of electrical parameters including active power, voltage, current, and frequency
  • Record the total electricity and time consumption
  • Calculate CO2 emissions
  • Detect power factor
  • Set the alarm threshold load
  • Display data on an LCD

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
RL78/L13 Datasheet Datasheet PDF 1.47 MB
RL78/L13 Mini Power Monitor Batch Download Sample Code ZIP 3.29 MB
Renesas RL78 Family Microcontrollers Brochure 日本語 Flyer PDF 5.89 MB