VV6501 datasheet(21/60 Pages) STMICROELECTRONICS

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VV6501

Functional Description

The available range of exposure (without using clock division) is shown in

Table 7.

3.1.12 Gain timing and exposure updates

Exposure and gain values are re-timed within the sensor to ensure that a new set of values is only

applied to the sensor array at the start of each frame. Bit 0 of the status register is set high when a

new exposure value is written via the serial interface but has not yet been applied to the sensor

array.

There is a 1 frame latency between a new exposure value being applied to the sensor array and the

results of the new exposure value being read-out. The same latency does not exist for the gain

value. To ensure that the new exposure and gain values are aligned up correctly the sensor delays

the application of the new gain value by one frame relative to the application of the new exposure

value.

To eliminate the possibility of the sensor array seeing only part of the new exposure and gain

settings, if the serial interface communication extends over a frame boundary, the internal re-timing

of exposure and gain data is disabled while writing data to any location in the exposure page of the

serial interface register map. Thus, if the 5 bytes of exposure and gain data is sent as an auto-

increment sequence, it is not possible for the sensor to consume only part of the new exposure and

gain data.

Table 7: Exposure ranges [24MHz system clock]

Range

Coarse

(no. lines)

Line length

(no. pixels)

Fine

(no. pixels)

Exposure

No. pixels

Time

Min.

762

0.92 µs

Max (default-VGA)

522

762

400,050

33.2 ms

Max (available)

1023

10232 + 1023

87.3 ms

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