Datasheet
Gray level
Entry
Data Out
(8-bits)
0 00000000b 0
00000000b
0 00000001b
1 00000001b 1 N/A 1 N/A
2 00000011b 2 N/A 2 N/A
3 00000011b 3 N/A 3 N/A
4 00000110b 4
00000100b
4 00000110b
5 00000110b 5 N/A 5 N/A
6 00000111b 6 N/A 6 N/A
7 00000111b 7 N/A 7 N/A
8 00001000b 8
00001000b
8 00001011b
9 00001010b 9 N/A 9 N/A
10 00001001b 10 N/A 10 N/A
11 00001011b 11 N/A 11 N/A
248 11111010b 248
11111000b
248 11111010b
249 11111010b 249 N/A 249 N/A
250 11111011b 250 N/A 250 N/A
251 11111011b 251 N/A 251 N/A
252 11111110b 252
11111100b
252 11111111b
253 11111101b 253 N/A 253 N/A
254 11111101b 254 N/A 254 N/A
255 11111111b 255 N/A 255 N/A
6-bit in / 8 bit out6-bit in / 6 bit out8-bit in / 8 bit out
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Data Out
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DS90UH926Q
SNLS337J –OCTOBER 2010–REVISED APRIL 2013
www.ti.com
Enabling white balance
The user must load all 3 LUTs prior to enabling the white balance feature. The following sequence must be
followed by the user.
To initialize white balance after power-on (Table 10):
1. Load contents of all 3 LUTs . This requires a sequential loading of LUTs - first RED, second GREEN, third
BLUE. 256, 8-bit entries must be loaded to each LUT. Page registers must be set to select each LUT.
2. Enable white balance.
By default, the LUT data may not be reloaded after initialization at power-on.
An option does exist to allow LUT reloading after power-on and initial LUT loading (as described above). This
option may only be used after enabling the white balance reload feature via the associated serial control bus
register. In this mode the LUTs may be reloaded by the master controller via I2C. This provides the user with the
flexibility to refresh LUTs periodically , or upon system requirements to change to a new set of LUT values. The
host controller loads the updated LUT values via the serial bus interface. There is no need to disable the white
balance feature while reloading the LUT data. Refreshing the white balance to the new set of LUT data will be
seamless - no interruption of displayed data.
It is important to note that initial loading of LUT values requires that all 3 LUTs be loaded sequentially. When
reloading, partial LUT updates may be made.
Figure 21. White Balance LUT Configurations
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