MCM20027 Motorola, MCM20027 Datasheet - Page 17

• Manufacturer Part Number: MCM20027
• Description: Color SXGA Digital Image Sensor 1280 x 1024 pixel progressive scan solid state image sensor with integrated CDS/PGA/ADC / digital programming / control
• Manufacturer: Motorola

Revision 8.0 - 28 November 2001 :
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
“PGA Gain Mode,” on page
NOTE!! The Diagrams above illustrates how the Color Gain Registers apply the gain onto each individual
color pixel data:
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Register
Green-Red Pixel
Blue Pixel Data
00h
01h
02h
03h
No
Data
DPGA Color 1 Gain
DPGA Color 2 Gain
DPGA Color 3 Gain
DPGA Color 4 Gain
Register; Table 10
Register; Table 11
Register Name
Register; Table 8
Register; Table 9
DPGA Color 3 Gain
DPGA Color 1 Gain
Register
Register
MCM20027
45.
Table 3. White Balance Gain modes and Gain Formulas
Variable
cg1
cg2
cg3
cg4
Table 25,
LINEAR
LINEAR
LINEAR
LINEAR
Modes
Gain
RAW
RAW
RAW
RAW
There are two different Gain modes for White Balance
and there are three different Gain modes for the Expo-
sure gain refer to
Formulas; Table 3
Formulas; Table 4
Red Pixel Data
Green-Blue
Pixel Data
Steps
33-63
33-63
33-63
33-63
Gain
0-32
0-47
0-32
0-47
0-32
0-47
0-32
0-47
1.391+ (0.0434* (cg1
1.391+ (0.0434* (cg2
1.391+ (0.0434* (cg3
1.391+ (0.0434* (cg4
0.6956 + (0.02174* cg1
0.6956 + (0.02174* cg2
0.6956 + (0.02174* cg3
0.6956 + (0.02174* cg4
0.6956 +(0.0434 x cg1
0.6956 +(0.0434 x cg2
0.6956 +(0.0434 x cg3
0.6956 +(0.0434 x cg4
White Balance Gain modes and Gain
DPGA Color 4 Gain
DPGA Color 2 Gain
and
for more info.
Gain Formula
Register
Register
Exposure Gain modes and Gain
ImageMOS
ImageMOS
d
d
d
d
-32)
-32)
-32)
-32)
d
d
d
d
d
d
d
d
)
)
)
)
)
)
)
)
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
Range
Gain
MOTOROLA
17