MCM20027 Motorola, MCM20027 Datasheet - Page 45

• 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 :
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
The
PGA Gain modes for the White Balance and Exposure
gains can be selected. There are two different Gain
modes for White Balance and there are three different
Gain modes for the Exposure gain.
White Balance Gain modes:
1) Raw gain mode - 32 steps @ 0.02174/step
2) Linear gain mode - 48 steps @ 0.04340/step
Exposure Gain Modes:
1) Raw gain mode - 32 steps @ 0.02174/step
Address
Address
Number
Number
msb (7)
PGA Gain Mode; Table
msb (7)
7 - 6
5 - 0
21
22
Bit
Bit
x
x
h
h
Function
Function
- 32 steps @ 0.04340/step
- 32 steps @ 0.04340/step
Unused
Gain
x
x
6
6
MCM20027
25, is the register where the
Unused
PGA Gain Mode
Raw Gain Mode [gg2
Raw Gain Mode [gg2
32)
(Range 0.696 - 2.736)
Linear Gain Mode -----> Gain = 0.6956 + (0.0434 * gg2
(Range 0.696 - 2.736)
Table 24. Exposure PGA Global Gain Register B
gg2[5]
x
5
5
Exposure PGA Global Gain B
Table 25. PGA Gain Mode
gg2[4]
PGA Gain Mode
x
4
4
d
d
= 0-32
= 33-63
Description
Description
d
i.e. PGA Global Gain A Register= Raw gain mode
2) Linear gain mode - 48 steps @ 0.04340/step
i.e. PGA Global Gain A Register= Linear gain mode
3) Linear 2 gain mode - 64 steps @ ~ 0.12/step
i.e. PGA Global Gain A Register= Linear 2 gain mode
The wbm bit sets the White Balance mode. While the
egm[d] bit sets the Exposure gain mode
] ---> Gain = 0.6956 + (0.02174* gg2
d
gg2[3]
] --> Gain = 1.391+ (0.0434* (gg2
PGA Global Gain B Register= Raw gain mode
PGAGlobal Gain B Register= Linear gain mode
PGA Global Gain B Register= Not used
x
3
3
gg2[2]
wbm
2
2
d
)
egm[1]
gg2[1]
ImageMOS
ImageMOS
1
1
d
-
d
)
Default
Default
001110
egm[0]
gg2[0]
Reset
Reset
State
State
lsb (0)
lsb (0)
0E
00
xx
b
h
h
MOTOROLA
45