AS3668 datasheet(51/60 Pages) AMSCO

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AS3668

Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

Table 49. Code Example Down-Dimming

Address

Write Value

Comments

CurrX Control

0x01

0xAA

Enable CURR1, CURR2, CURR3 and CURR4 for On mode.

CURR1 Current

0x02

0x64

Set the output current of CURR1 to 10mA.

CURR2 Current

0x03

0x64

Set the output current of CURR2 to 10mA.

CURR3 Current

0x04

0x64

Set the output current of CURR3 to 10mA.

CURR4 Current

0x05

0x64

Set the output current of CURR4 to 10mA.

PWM Trigger

0x17

0x0F

Enable CURR1, CURR2, CURR3 and CURR4 for PWM mode.

All four current sources keep switched on when we

change from On Mode to PWM Mode.

PWM Timing

0x16

0x77

Define dimming time with 1.6s

PWM Trigger

0x17

0x10

Start down-dimming of all current sources with 1.7s

dimming time.

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