C11 datasheet(39/72 Pages) AMSOSRAM

39 / 72 page

AS3688

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (ptr,tje)

Revision 1.1.1 / 20060707

37 - 70

Figure

22 – Softdimming Architecture for the AS3688 (softdim_pattern=1 and pattern_color = 1)

With the AS3688 smooth fade-in and fade-out effects can be automatically generated.

As there is only one dimming ramp generator and one pwm modulator following constraints have to be

considered when setting up the pattern (applies only if pattern_color=1):

Figure

23 – Softdimming example Waveform for RGB1, RGB2 and RGB3

However using the identical dimming waveform for two channels is possible as shown in the following figure:

Figure

24 – Softdimming example Waveform for RGB1, RGB2 and RGB3

RGB1

RGB2

RGB3

not possible

A new dimming up (RGB2) can be

started after the dimming

down (RGB1) is finished

A new dimming up (RGB3) cannot be

started after or while one channel (RGB1)

is dimming up

RGB1

RGB2

RGB3

Pattern

Generator

Dimming

Ramp

Gen

up down

PWM

Modulator

Zero

Detect

Flip Flop

set

reset

out

Flip Flop

set

reset

out

Flip Flop

set

reset

out

RGB1/CURR1/CURR41/CURR30

RGB2/CURR2/CURR42/CURR31

RGB3/

/CURR43/CURR32,33

controls current sources (on/off) for

current source where

currX_mode = LED pattern

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