AS3677 datasheet(26/68 Pages) AMSCO

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AS3677

Datasheet - D e ta i l e d D e s c r i p t i o n

With the AS3677 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:

Figure 20. Soft dimming example Waveform for CURR30-32

LED Pattern Registers

Table 31. Pattern data0...Pattern data3

Registers

Addr: 19h,1Ah,1Bh,1Ch

Pattern data0, Pattern data1, Pattern data2, Pattern data3

This registers contains the pattern data for the current sinks.

Bit

Bit Name

Default Access

Description

7:0

pattern_data_0

1. Update any of the pattern register only if none of the current sources is connected to the pattern generator

('xxxx'_mode must not be 11b). The pattern generator is automatically started at the same time when any of the

current sources is connected to the pattern generator

R/W

Pattern data0

7:0

pattern_data_1

R/W

Pattern data1

7:0

pattern_data_2

R/W

Pattern data2

7:0

pattern_data_3

R/W

Pattern data3

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