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參數(shù)資料
| 型號： | STV5404E-001 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Mono and Colour Digital Video CMOS Image Sensors |
| 中文描述： | 莫諾和數(shù)字視頻彩色CMOS圖像傳感器 |
| 文件頁數(shù)： | 35/54頁 |
| 文件大?。?/td> | 786K |
| 代理商： | STV5404E-001 |
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VV5404 & VV6404
CD5404-6404F-A
35/54
5.5.9
There is a set of programmable registers which controls the sensitivity of the sensor. The registers are as follows:
1. Fine exposure.
2. Coarse exposure time.
3. Gain.
4. Clock division.
The gain parameter does not affect the integration period rather it amplifies the video signal at the output stage of the
sensor core.
Note:The external exposure (coarse, fine, clock division or gain) values do not take effect immediately. Data from
the serial interface is read by the exposure algorithm at the start of a video frame. If the user reads an exposure value
via the serial interface then the value reported will be the data as yet unconsumed by the exposure algorithm, because
the serial interface logic locally stores all the data written to the sensor.
Between writing the exposure data and the point at which the data is consumed by the exposure logic, bit 0 of the
status register is set. The gain value is updated a frame later than the coarse, fine and clock division parameters,
since the gain is applied directly at the video output stage and does not require the long set up time of the coarse and
fine exposure and the clock division.
To eliminate the possibility of the sensor array seeing only part of the new exposure and gain setting, if the serial
interface communications extends over a frame boundary, the internal re-timing of exposure and gain data is disabled
while writing data to any location in the Exposure page of the serial interface register map. Thus if the 5 bytes of
exposure and gain data is sent as an auto-increment sequence, it is not possible for the sensor to consume only part
of the new exposure and gain data.
The range of some parameter values is limited and any value programmed out-with this range will be clipped to the
maximum allowed.
Exposure Control Registers [010_0000
2
] - [010_1001
2
]
oeb_composite
su5[4]
su5[3]
Comments
0
0
0
Drive strength = 2mA
0
0
1
Default drive strength = 4mA
0
1
0
Drive strength = 6mA
0
1
1
unallocated
1
x
x
Outputs are not being driven therefore
driver strength is irrelevant
Table 23 : Output driver strength selection
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