AS3689 datasheet(38/72 Pages) AMSOSRAM

38 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

36 - 70

Figure 18 – LED Pattern Generator AS3689 for pattern_color = 1

Only those current sinks will be controlled, where the ‘xxxx’_mode register is configured for LED pattern.

If the register bit pattern_slow is set, all pattern times are increased by a factor of eigth. (bit duration: 250ms if

pattern_color=0 / 800ms if pattern_color=1, delays between pattern up to 24s).

7.4.5.1 Soft Dimming for Pattern

The internal pattern generator can be combined with the internal pwm dimming modulator to obtain as shown in

the following figure:

Figure 19 – Softdimming Architecture for the AS3689 (softdim_pattern=1 and pattern_color = 1)

With the AS3689 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):

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/CURR6/CURR43/CURR32,33

controls current sources (on/off) for

current source where

currX_mode = LED pattern

RGB1/CURR1/CURR41/CURR30

3 6 9

... 30

...

100ms

(800ms if pattern_slow=1)

RGB2/CURR2/CURR42/CURR31

RGB3/CURR6/CURR43/CURR32,33

... 29

... 28

1 4 7

2 5 8

3 6 9

1 4 7

2 5 8

...

Defined by bit in the setup register pattern_data

in this example the code is 111110001011111000110111...

At this time a delay of 0s,1s(8s),2s(16s) or 3s(24s)

can be programmed

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