MCM20027 Datasheet, PDF (17/73 Pages) Motorola, Inc – Color SXGA Digital Image Sensor 1280 x 1024 pixel progressive scan solid state image sensor

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
ImageMOS
7.4.3 Gain Modes
There exists different gain modes that are available
when the sensor is performing White Balance and Ex-
posure gain. The Gain mode utilized for White balance
and Exposure gain can be selected by the user writing
different values to the register described in Table 25,
“PGA Gain Mode,” on page 45.
There are two different Gain modes for White Balance
and there are three different Gain modes for the Expo-
sure gain refer to White Balance Gain modes and Gain
Formulas; Table 3 and Exposure Gain modes and Gain
Formulas; Table 4 for more info.
Register
No
00h
01h
02h
03h
Register Name
Variable
Gain
Modes
Gain
Steps
Gain Formula
DPGA Color 1 Gain
cg1
Register; Table 8
RAW
0-32
33-63
0.6956 + (0.02174* cg1_d)
1.391+ (0.0434* (cg1_d-32)
LINEAR
0-47
0.6956 +(0.0434 x cg1_d)
DPGA Color 2 Gain
cg2
Register; Table 9
RAW
0-32
33-63
0.6956 + (0.02174* cg2_d)
1.391+ (0.0434* (cg2_d-32)
LINEAR
0-47
0.6956 +(0.0434 x cg2_d)
DPGA Color 3 Gain
cg3
Register; Table 10
RAW
0-32
33-63
0.6956 + (0.02174* cg3_d)
1.391+ (0.0434* (cg3_d-32)
LINEAR
0-47
0.6956 +(0.0434 x cg3_d)
DPGA Color 4 Gain
cg4
Register; Table 11
RAW
0-32
33-63
0.6956 + (0.02174* cg4_d)
1.391+ (0.0434* (cg4_d-32)
LINEAR
0-47
0.6956 +(0.0434 x cg4_d)
Table 3. White Balance Gain modes and Gain Formulas
Gain
Range
0.69-1.39
1.39-2.74
0.69-2.74
0.69-1.39
1.39-2.74
0.69-2.74
0.69-1.39
1.39-2.74
0.69-2.74
0.69-1.39
1.39-2.74
0.69-2.74
Green-Red Pixel
Data
Red Pixel Data
DPGA Color 1 Gain
Register
DPGA Color 2 Gain
Register
Blue Pixel Data
DPGA Color 3 Gain
Register
Green-Blue
Pixel Data
DPGA Color 4 Gain
Register
NOTE!! The Diagrams above illustrates how the Color Gain Registers apply the gain onto each individual
color pixel data:
Revision 8.0 - 28 November 2001 : MCM20027
MOTOROLA
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