參數(shù)資料
型號: VV5410
廠商: 意法半導體
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): 21/105頁
文件大小: 489K
代理商: VV5410
CMOS Sensor; Customer Datasheet, Rev 3.0, 28 September 2000
VV5410 & VV6410
Commercial in confidence
cd5410-6410f-3-0.fm
6.
Exposure Control
6.1
The exposure time, comprising coarse and fine components, for a pixel and the analogue gain are programmable via the serial
interface.
Calculating Exposure Period
The coarse exposure value sets the number of complete lines a pixel exposes for, while the fine exposure sets the number of
additional pixel clock cycles a pixel integrates for. The sum of the two gives the overall exposure time for the pixel array.
Exposure Time = ((Coarse setting x Line Period) + (Fine setting)) x (CLKI clock period) x Clock Divider Ratio
note1: Clock Divider Ratio = 1/(Basic Clock Division * Optional Pixel Clock Divisor)
Default Clock Divider Ratio as follows: (Optional Pixel Clock Divisor = 1)
PAL/NTSC - 1/2
CIF - 1/4
QCIF - 1/8
The maximum coarse and fine exposure settings are a function of the field and line lengths respectively. The maximum coarse
exposure is current field length - 1 and the maximum fine exposure is current line length - fixed offset, see below. If an exposure
value is requested that is beyond the maximum then the applied exposure setting will be clipped to the current maximum.
6.2
The analogue gain in VV5410/VV6410 is programmed via the 8 bit gain register[36]. The analogue gain comprises 2
components, capacitive gain, (set by the ms nibble), and current gain, (set by the ls nibble). It is strongly recommended that the
capacitive gain setting is left at the default value of 4’b1111. Table 7 details the available gain settings in 9bit, (PAL or NTSC),
and 10bit, (CIF or QCIF), modes. We assume that mode_select[24], bit1 is 0. gain[7:0] is the value programmed in register[36].
The ls nibble of the gain value is limited to 4’he, with 4’hf not permitted.
Gain Components
Video Mode
Fine Exposure Offset (pck’s)
NTSC
51
PAL
86
CIF
51
QCIF
23
Table 6 : Fine Exposure Offset
The current revision of VV5410/VV6410 in the following modes of operation:
VP3 mode (OFF), QCIF and PAL (Video mode)
has an error in the application of coarse exposure. Please contact STMicroelectronics for more details.
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