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参数资料
| 型号： | CS7620-IQ |
| 厂商： | CIRRUS LOGIC INC |
| 元件分类： | 消费家电 |
| 英文描述： | CCD IMAGER ANALOG PROCESSOR |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | 10 X 10 X 1.40 MM, MS-026, TQFP-64 |
| 文件页数： | 45/70页 |
| 文件大小： | 1032K |
| 代理商： | CS7620-IQ |
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CS7620
DS301PP2
45
4
lowres_sen3
Sensitivity in Low Resolution Mode:
lowres_sens provides a way to increase the sensitivity
during low resolution mode (see Figure 33).
For proper settings of these values, please refer to the CCD data sheets.
In order to allow for a video mode, (low resolution) IBM 1.3Mpixel and 2.0Mpixel have a storage
area that is in both cases 262 lines long. The use of this transfer area, is to keep the pixels cov-
ered from light during readout. This must be done because it is not practical to have a shutter
at such high speed. Without the storage area the picture would be smeared, since the last line
to be readout would have had a lot more exposure time than the first one.
To solve this the storage area is used in the following manner. In the 1.3Mpixel there are 4 times
more active lines than there are storage lines. The low resolution mode consists of two steps:
Step 1: transfer:
During this step, the active lines are subsampled into the storage area. In the 1.3Mpixel there
are 4 times more active lines than there are storage lines, so that active line one will be stored
into storage line 1, active line 5 will be stored into storage line 2, active line 9 into storage line 3
and so on until finally active line 1045 will be stored into storage line 262.
Step 2: readout:
During this step, the data in the storage area is transferred line by line into the horizontal regis-
ter, from where it will be read out sequentially.
By using this optically covered transfer area, there is still a minimum amount of smear in the low
resolution mode. However, it is greatly reduced. This smear will only take place during the trans-
fer time, because the pixels in the active area are constantly being exposed since the shutter is
always open in the low resolution mode. This however is a small percentage of the total expo-
sure.
Sensitivity:
The sensitivity of the CCD to light can be increased by 2x or 3x in the IBM 2.0M with RGRG,
GBGB Bayer pattern. With a 2x extra sensitivity, twice as many photons will be accumulated.
This mode can be used to increase resolution in low light scenes, and should be part of the
AGC/iris control loop.
To achieve this extra sensitivity, 2 lines from the active area get added together into one line in
the storage area. this is done by having an additional pulse on the s1 line (see Figure 33).
Below are some examples:
All of this can be programmed using register lowres_sen(25h).
Each bit of this register controls one pulse.
The first pulse is always on.
0000 means only first pulse is on
1000 means the second and first pulse are on
0100 means the third and first pulse are on
0010 means the fourth and first pulse are on
0001 means the fifth and first pulse are on
0101 means the third, fifth and first pulse are on
Note that the user has to select very carefully the lines to be added. The selection of the lines is
based on the color coating of the CCD. In some cases of color coating it is possible to add 2
lines, in other cases it is possible to add 3 lines (see below).
(R = Red Pixel, B = Blue Pixel, G = Green Pixel)
3
lowres_sen2
2
lowres_sen1
1
lowres_sen0
Bit Mnemonic
Function
相关PDF资料 |
PDF描述 |
|---|---|
| CS7622 | CCD Imager Analog Processor |
| CS7622-IQ | CCD Imager Analog Processor |
| CS7654 | CCD COLOR SPACE PROCESSOR WITH ANALOG OUTPUT |
| CS7654-KQ | CCD COLOR SPACE PROCESSOR WITH ANALOG OUTPUT |
| CS7666 | DIGITAL COLOR-SPACE PROCESSOR FOR CCD CAMERAS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CS7621-4 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| CS7622 | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:CCD Imager Analog Processor |
| CS7622-IQ | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:CCD Imager Analog Processor |
| CS7631-4 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| CS7636-000 | 制造商:TE Connectivity 功能描述:55A4122-22-6/9-9CS2275 |
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