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AS3689 数据表(PDF) 38 Page - ams-OSRAM AG

部件名 AS3689
功能描述  Flexible Lighting Management
PDF  72 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AMSOSRAM [ams-OSRAM AG]
网页  https://ams-osram.com/
标志 AMSOSRAM - ams-OSRAM AG

AS3689 数据表(HTML) 38 Page - ams-OSRAM AG

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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
8
PWM
Modulator
Zero
Detect
RS
Flip Flop
set
reset
out
RS
Flip Flop
set
reset
out
RS
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
I
t
...
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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