Renesas' flower reference design showcases a diverse portfolio of products for broad market applications. From power management to precision analog and specialty ICs, we've got you covered for your designs.

The Flower Power reference design highlights Renesas' 4.5V – 18V input switching regulator. This board utilizes the ISL85005, 5A device as a representative of this full line-up of wide-input switching regulators. Additionally, the board uses the ISL29102 light-to-voltage sensor, the ISL21080 300nA NanoPower voltage reference, and the ISL28915 NanoPower, push/pull output comparator. The board is powered from two Energizer CR2032 3V coin cell batteries and thanks to its low-power design, will be able to deliver over 1,000 song cycles.

The Flower Power PCB is shaped like a 5-petal flower and comes in two colors, purple and yellow. It has five RGB LEDs on the front and an Renesas ambient light sensor to control the LED brightness. The flower features a Microchip MCU programmed to plays five songs while the LED lights flash in random patterns.


This reference design is intended to be a fun office adornment. Simply press the button on the back and the flower will play one of five classic “Summer of Love” songs and create an eye-pleasing color LED pattern on the petals. It comes with a suction cup hanger that can be used to hang the board on a window or any smooth surface.

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.


  • Displays a light pattern for low battery alert
  • Automatically enters power savings mode
  • Is powered with two CR2032 coin cell batteries; includes suction cup for hanging
  • When start button is pressed, LEDs flash in a pattern to the melody of the five hippie-era songs: "Do You Believe in Magic," "Are you Going to San Francisco," "Here Comes the Sun," "Age of Aquarius/Let the Sun Shine In," and "Puff the Magic Dragon"

The following Renesas and partner products are featured in this reference design:

  • ISL85005 – 4.5V to 18V input, 5A high-efficiency synchronous buck regulator
  • ISL29102 – Low power ambient light-to-voltage nonlinear converter
  • ISL21080 – 300nA NanoPower voltage references
  • ISL28915 – NanoPower, push/pull output comparator
  • ATmega328P-AU – picoPower® technology 8-bit AVR® RISC-based (MCU)
  • ASPI-0630LR series – Abracon molding type power inductor
  • PKLCS1212E4001-R1 – Murata SMD piezoelectric sounder plus seven capacitors



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Datasheet PDF 1.32 MB
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Datasheet PDF 1.24 MB
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Design & Development

Software & Tools

Software Downloads

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PCB Design Files ZIP 921 KB
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