MEC1322 datasheet(330/456 Pages) MICROCHIP

330 / 456 page

MEC1322

DS00001719D-page 330

 2014 - 2015 Microchip Technology Inc.

The breathing range of and LED can range between full on and full off, or in a range that falls within the full-on/full-off

range, as shown in this figure. The ramp time can be different in different applications. For example, if the ramp time

was 1 second, the LED would appear to breathe quickly. A time of 2 seconds would make the LED appear to breathe

more leisurely.

The breathing pattern can be clipped, as shown in the following figure, so that the breathing effect appears to pause at

its maximum and minimum brightnesses:

FIGURE 28-3:

CLIPPING EXAMPLE

The clipping periods at the two extremes can be adjusted independently, so that for example an LED can appear to

breathe (with a short delay at maximum brightness) followed by a longer “resting” period (with a long delay at minimum

brightness).

The brightness can also be changed in a non-linear fashion, as shown in the following figure:

FIGURE 28-4:

EXAMPLE OF A SEGMENTED CURVE

In this figure, the rise and fall curves are implemented in 4 linear segments and are the rise and fall periods are sym-

metric.

The breathing mode uses the 32.768 KHz clock for its time base.

Full off

Full on

Min Duty Cycle

Max Duty Cycle

Full off

Full on

MEC1322 Datasheet(PDF) 330 Page - Microchip Technology