VV5430 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'VV5430' PDF : 33 Pages View PDF
VV5430
Write to Camera
Header Code (fine)
= 0100
Valid data bits: 9
The 18 bit exposure control value is formed from two 9-bit values, coarse (9 msb’s) and fine (9 lsb’s). For external exposure
control (AEC = 0) the exposure value can be set via the serial interface (header codes 0011 and 0100). Values written that
exceed the mode dependant maxima will be ignored and the maximum will be used.
Bit
Function
CCIR
EIA
min
min
max
max
0-8 Coarse exposure value 0
310 0
260
0-8
Fine exposure value
0
404 0
325
9-11
Unused
Table 18 : Exposure Values
Comments
Header code 0011
Header code 0100
Exposure Control Thresholds T1 and T2
Header Code (T1)
Valid data bits: 9
= 1000
Header Code (T2)
= 1001
Valid data bits: 9
The lower and upper pixel count thresholds are used by the automatic exposure controller. The power-on default values for T1
and T2 are exposure mode and video mode dependant. If the external pixel threshold control bit (bit 6 in Setup Code_2 register)
is set the internal default values for T1 and T2 are overridden by the serial interface values. Note that only the most significant
nine bits of each seventeen bit threshold can be controlled.
Bit
0-8
0-8
9 - 11
DAC
Comments
Lower Exposure control threshold (T1)
Header Code 1000
Upper Exposure control threshold (T2)
Header Code 1001
Unused
Table 19 : Pixel Count Thresholds (T1,T2)
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CD5430F-A
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