CA-RU150R30XG-3965U-01-W10 User’s Manual
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LVDS Backlight Brightness Control
LVDS Backlight Brightness Control The LVDS controller support 17 level of backlight brightness value
from 0 (30%) to 16 (100%) and it is accessible through SMBus. The associated access method
(SMBus_ReadByte, SMBus_WriteByte) are provided in part 4.
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Set the Level of LVDS Backlight
Write 0xED into address 0x7F on SMBus device 0x42.
Write desired backlight level from 0x0 (30%) to 0x10 (100%) into address 0x6E on SMBus device 0x42.
Example: Set LVDS backlight level to 0x10 (100%)
SMBus_WriteByte (0x42, 0x7F, 0xED);
SMBus_WriteByte (0x42, 0x6E, 0x10); // Set brightness to 100%
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Read the Level of LVDS Backlight
Write 0xED into address 0x7F on SMBus device 0x42.
Read current backlight level from address 0x6E on SMBus device 0x42.
Example: Get LVDS backlight level
SMBus_WriteByte (0x42, 0x7F, 0xED); BKL_Value =
SMBus_ReadByte (0x42, 0x6E);
