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AS3675 Datasheet(PDF) 38 Page - ams AG |
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AS3675 Datasheet(HTML) 38 Page - ams AG |
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38 / 81 page  www.austriamicrosystems.com/AS3675 1v3 37 - 80 AS3675 Datasheet - D e ta i l e d D e s c r i p t i o n 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 eight. (bit duration: 250ms if pattern_color=0 / 800ms if pattern_color=1, delays between pattern up to 56s). Soft Dimming for Pattern The internal pattern generator can be combined with the internal pwm dimming modulator to obtain as shown in the fol- lowing figure: Figure 18. Soft dimming Architecture for the AS3675 (softdim_pattern=1 and pattern_color = 1) With the AS3675 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 19. Soft dimming example Waveform for CURR30-32 However using the identical dimming waveform for two channels is possible as shown in the following figure: ! " # $ "$ #$ % $& " # ' (()( * +, -./ |
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