參數(shù)資料
型號: VV5430C001
廠商: 意法半導體
英文描述: Monochrome Analog Output CMOS Image Sensors
中文描述: 單色模擬輸出CMOS圖像傳感器
文件頁數(shù): 23/33頁
文件大?。?/td> 256K
代理商: VV5430C001
VV5430
Write to Camera
CD5430F-A
23/33
10. Write to Camera
Information to be communicated from host to camera consists of configuration data (for example automatic gain control ON), and
parametric information (for example sensor integration time). The write data is formed into two bytes. A 4-bit Header Code in the
first byte is used by the camera to determine the destination of the 12-bit message following the header.
Figure 10 : Receive Data Format
After the camera acknowledges the receipt of a valid address the host transfers the first data byte which the camera
acknowledges by pulling SDA low. The second byte is then sent followed by a final acknowledge from the camera. A stop
condition is produced by the host after the second message byte. As with the read procedure, the stop condition is not absolutely
necessary as the camera’s serial interface will reset automatically after two bytes have been received.
The valid Header Codes and their data structures are fully described in the following pages.
10.1 Timing Protocol
When an exposure or gain value has been written to the camera it is held in the interface until the camera is ready to consume
the new data. For correct operation, there should be no further read or write accesses to the camera during this hold period.
Normal communication between other modules connected to the serial interface will not cause problems. The minimum length of
the wait period is
40ms
in EIA mode and
34ms
in CCIR mode from the end of the data transfer.
S
ADDRESS[7:1]
R
/
W
A
DATA[11:8]
DATA[7:0]
A
A P
Write = 0
Camera acknowledge (valid address)
Camera acknowledge
HEADER
0 0 1 0 0 x x 0
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