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參數資料
| 型號： | MCM20014IBMN |
| 廠商： | MOTOROLA INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | 1/3” Color VGA Digital Image Sensor |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, CQCC48 |
| 封裝： | CERAMIC, LCC-48 |
| 文件頁數： | 28/54頁 |
| 文件大小： | 761K |
| 代理商： | MCM20014IBMN |
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MOTOROLA
MCM20014
28
The
Global DOVA Register; Table 20
performs a final
offset adjustment in analog space prior to the ADC. The
6-bit register uses its MSB to indicate positive or nega-
tive offset. Each bit value changes the offset value by 4
LSB code levels hence giving an offset range of +/-124
LSB. As an example, to program an offset of +92 LSB,
the binary representation of +23
d
i.e. 010111
b
should
be loaded.
5.4 Post ADC Block
The post ADC block contains the bad-pixel replacement
registers and a general output control register.
The
White Pixel Threshold Register; Table 21
, and
Black Pixel Threshold Register; Table 22
, are used to
set the thresholds for white and black pixel replace-
ments. The MSBs on the
Black Pixel Threshold Regis-
ter
are hard coded to 00
b
hence a black replacement
threshold value between 0
d
- 255
d
can be set. This forc-
es the sensor to replace any pixel value at or below the
threshold by the average value of the neighboring same
color pixels. Similarly the MSBs on the
White Pixel
Threshold Register
are hard coded to 11
b
hence a white
replacement threshold level between 768
d
- 1023
d
can
be set. Again; as in the dark thresholding, if the sensor
encounters any pixel value that exceeds the set thresh-
old, it will replace it with the average value of the neigh-
boring same color pixels.
Care should be taken in assigning these thresholds.
This function performs an averaging effect on the im-
age, therefore, the greater the code distance the thresh-
olds move from the voltage rail, the more averaging
occurs between pixels.
2 - 0
Offset
Offset = 2 * cor
d
auto
Address
22
h
Column DOVA RAM
Default
00
h
msb (7)
6
5
4
3
2
1
lsb (0)
x
x
x
x
cor[3]
cor[2]
cor[1]
cor[0]
Table 19. Column DOVA RAM
Address
23
h
Global DOVA
Default
00
h
msb (7)
6
5
4
3
2
1
lsb (0)
x
x
gd[5]
gd[4]
gd[3]
gd[2]
gd[1]
gd[0]
Bit
Number
Function
Description
Reset
State
7 - 6
Unused
Unused
xx
5
Sign
0
b
= Positive Offset
1
b
= Negative Offset
0
b
5 - 0
Offset
Offset = gd
d
00000
b
Table 20. Global DOVA Register
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