STV-5301-E01 Ver la hoja de datos (PDF) - Vision

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STV-5301-E01

Mono and Colour QSIF Digital Video CMOS Image Sensors

Vision 

CMOS Sensor; Customer Datasheet, Rev 3.0, 25 September 2000

VV5301 & VV6301

6. Timed Serial Interface Parameters

The previous section, Exposure Control, introduced the concept of a “timed parameter”, that is information that is written via the

serial interface but will not be used immediately by the sensor, rather there will be a delay before the information is passed to the

internal registers (referred to as the working registers) from the serial interface registers (referred to as the shadow registers). It is

the contents of the working registers that will determine sensor behaviour.

6.1 Listing and Categorizing the Parameters

The timed parameters are split into 2 categories as follows:

• fine and coarse exposure

• gain

There is a “pending” flag for each of the above categories. These flags are stored in Status0 Register[2] in bits [0] and [2]. If one

of the flags is high this indicates that the working register/s controlled by that flag have yet to be updated from the according

shadow register/s. This feedback information could be useful if a user is, for example, attempting to write an external exposure

controller. The status of the pending flags allows accurate timing of the serial interface communications.

6.1.1 Fine and Coarse Exposure

The exposure category comprises registers[32,33] and [34,35].

6.1.2 Gain

The gain category simply comprises register[36].

6.2 Timed Parameter Update Points

The timed parameter categories are updated as follows:

note: We refer to odd and even fields in the table below. Each field is identical in length but we have to be able to differentiate

between fields to enable correct updating of register parameters.

Timed parameter category

Updated point

fine and coarse exposure

During the interline period between the last line of the odd field and the first

line of the even field.

gain

During the interline period between line 143 and line 144 in the even field.

Table 6 : Timed Parameter Update Points

If a change in exposure and gain are pending at the same time then the exposure value will be updated first followed by the gain.

This will ensure image illumination continuity from field to field.

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