300 Intersil light-sensing reference boards free at embedded world

300 Intersil light-sensing reference boards free at embedded world

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By Graham Prophet

The reference design board will be demonstrated live at the show and takes its cue from the 50th anniversary of the San Francisco “Summer of Love”. It has a five-petal flower outline and features five RGB LEDs on the front. Signals from an Intersil ambient light sensor are used to control the brightness of the LEDs.

The flower board also features a Microchip ATmega328P picoPower 8-bit AVR microcontroller programmed to play five songs while the LED lights flash in random patterns. In addition, the board:

– is powered by two CR2032 Energizer coin cell batteries

– displays a light pattern to alert the user when the batteries’ state of charge is low

– automatically enters power-saving mode


The reference design includes the following Intersil parts: ISL85005 – 5A high efficiency synchronous buck regulator with a 4.5V-18V input; ISL29102 – low-power ambient light-to-voltage non-linear converter; ISL21080 – 300nA nanopower voltage reference; ISL28915 – nanopower push/pull output comparator. It also includes an Abracon ASPI-0630LR power inductor and a Murata PKLCS1212E4001-R1 piezoelectric sounder.


Future Electronics;



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