LP3954 Datasheet, PDF (18/60 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

LP3954
SNVS340D – JUNE 2005 – REVISED MARCH 2013
The figure below shows an example of RGB CET and TT times.
COMMAND EXECUTION TIME = CET₁
TRANSITION TIME = TT₁
CET₂
TT₂
CET₃
TT₃
www.ti.com
BLUE
GREEN
RED
TT < CET
The command execution time also may be less than the transition time – the figure below illuminates this case.
TRANSITION TIME = TT₁
COMMAND EXECUTION TIME = CET₁
TT₂
Target values
CET₂
CET₃
TT₃
BLUE
GREEN
RED
TT₁ > CET₁
TT₂ < CET₂
TT₃ < CET₃
LOOP CONTROL
Pattern generator commands can be looped using the LOOP bit (D1) in Pattern gen ctrl register (11H). If
LOOP=1 the program will be looped from the command 8 register or if there is 0000 0000 and 0000 0000 in one
command register. The loop will start from command 1 and continue until stopped by writing rgb_start=0 or
loop=0. The example of loop is shown in following figure:
LOOP=1
IF 0000 0000 and 0000 0000 then Æ LOOP
COMMAND 1
COMMAND 2
COMMAND 3
ADDRESS 50H
ADDRESS 51H
ADDRESS 52H
ADDRESS 53H
ADDRESS 54H 0
ADDRESS 55H 0
00
00
00
00
00 0
00 0
18
Submit Documentation Feedback
Product Folder Links: LP3954
Copyright © 2005–2013, Texas Instruments Incorporated