AS3687 datasheet(27/55 Pages) AMSCO

27 / 55 page

AS3687/87XM

Datasheet

www.austriamicrosystems.com/AS3687

1v3-4

26 - 54

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

18 – Softdimming example Waveform for CURR30-32

CURR30

CURR31

CURR32

not possible

A new dimming up (CURR32) can be

started after the dimming

down (CURR30) is finished

A new dimming up (CURR32) cannot be

started after or while one channel (CURR30)

is dimming up

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

Figure

19 – Softdimming example Waveform for CURR30-32

CURR30

CURR31

CURR32

7.3.3.2 LED Pattern 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_data0[7:0]

R/W

Pattern data0

7:0

pattern_data1[15:8]

R/W

Pattern data1

7:0 pattern_data2[23:16]

R/W

Pattern data2

7:0 pattern_data3[31:24]

R/W

Pattern data3

Note:

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

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