VX6854LC datasheet(18/114 Pages) STMICROELECTRONICS

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Functional description

VX6854LC

18/114

DocID027110 Rev 2

3.2

Digital video block

3.2.1

Features

•

Frame rate: 20 frame/s maximum can be reduced down to less than 3 frame/s

(3.15 Mpixel) using frame extension

•

Automatic dark calibration to ensure consistent video level over varying scenes

•

On-chip power-on-reset cell

•

Output format: 3.15 Mpixel 2064 x 1552 (maximum)

3.2.2

Dark calibration algorithm

VX6854LC runs a dark calibration algorithm on the raw image data to control the video

offsets caused by dark current. This ensures that a high quality image is output over a range

of operating conditions. First frame dark level is correctly calibrated, for subsequent frames

the adjustment of the dark level is damped by a leaky integrator function to avoid possible

frame to frame flicker.

3.3

Device operating modes

Figure 6 shows the various operating modes used by the system. The modes are

exaplained in Table 6.

Figure 6. System state diagram

STREAMING

CSI-2

SW-STANDBY

CCP2

SW-STANDBY

CSI-2

HW-STANDBY

CSI-2

POWER-OFF

CSI-2

STREAMING

CCP2

CCI

Power supplies ON

Power supplies OFF

CCI and EXTCLK

stopped or

XSHUTDOWN is low

Power supplies OFF

CCI and EXTCLK

stopped or

XSHUTDOWN is low

CCI and EXTCLK

is running and

XSHUTDOWN is high

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