STV0672 datasheet(73/105 Pages) STMICROELECTRONICS

73 / 105 page

CMOS Sensor; Customer Datasheet, Rev 3.0, 28 September 2000

VV5410 & VV6410

Commercial in confidence

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cd5410-6410f-3-0.fm

[25-31],

[19-1F] - unused

9.5.3

Exposure Control Registers [32 - 47],

[20-2F]

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.

3. Analog gain.

4. Clock division

Note

: As we know from an explanation earlier in this document (see Section 6. for further details) the exposure control

registers are not updated immediately, rather they are timed to be updated at a precise point in the field timing.

The range of some parameter values is limited and any value programmed out-with this range will be clipped to the maximum

currently permitted, (the fine and coarse maximum allowable settings are set by the current line and field length respectively).

Retro mode for gain application

Off/On

The gain passed to the CAB comprises 2 components,

IDAC[3:0] and CDAC[5:0]. If the user selects the retro

mode then the IDAC value will be the inverse of the ls

gain nibble. The user is barred from writing to the ms

gain nibble. In the non retro mode all 8 bits are availa-

ble to program. The 2 ls bits of CDAC[5:0] are ﬁxed at

2’b11.

Select log CDAC ramp

Off/On

By default the same CDAC value is applied for the

duration of every line of every ﬁeld. Setting this bit

causes the CDAC value to be varied during the line.

7:3

Index10

Index16

Bits

Function

Default

Comment

Fine MSB exposure value

The maximum fine exposure is line

length dependent. The expressions

used to calculate the maximum fine

exposure for each of the default

video modes, that can be selected

via Setup0 register, are as follows

NTSC = line length - 51

PAL = line length - 86

CIF = line length - 51

QCIF = line length - 23

7:0

Fine LSB exposure value

Bit

Function

Default

Comment

Table 45 : [24],

[18] - Mode Select

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