VS6624P0LP datasheet(15/100 Pages) STMICROELECTRONICS

15 / 100 page

VS6624

Operational modes

Rev 1

15/100

Pause mode

In this mode all VS6624 clocks are running and all registers are

accessible but no data is output from the device. The device is ready to start streaming but

is halted. This mode is used to set up the required output format before outputting any data.

The analogue video block is powered down, leading to a lower global consumption

Note:

The PowerManagement register can be adjusted in PAUSE mode but has no effect until the

next RUN to PAUSE transition.

4.1

Streaming modes

RUN mode

This is the fully operational mode. In running mode the device outputs

a continuous stream of images, according to the set image format parameters and frame

rate control parameters. The image size is derived through downscaling of the SXGA image

from the pixel array.

ViewLive this feature allows different sizes, formats and reconstruction settings to be

applied to alternate frames of data, while in run mode.

Snapshot mode

The device can be configured to output a single frame according to

the size, format and reconstruction settings in the relevant pipe setup bank. In normal

operation this frame will be output, once the exposure, white balance and dark-cal systems

are stable. To reduce the latency to output, the user may manually override the stability

flags.

The snapshot mode command can be issued in either Run or Stop mode and the device will

automatically return previous state after the snapshot is taken. The snapshot mode must not

be entered into while viewlive is selected.

FLASHGUN mode

In flashgun mode, the array is configured for use with an external

flashgun. A flash is triggered and a single frame of data is output and the device

automatically switches to Pause Mode.

VS6624 supports the following flashgun configurations:

●

Torch Mode - user can manually switch on/off the FSO IO pin via a register setting.

Independent of mode.

●

Pulsed Mode - the flash output is synchronized to the image stream. There are two

options available:

–

Pulsed flash with snapshot. Device outputs a single frame synchronized to flash.

–

Pulsed flash with viewfinder. Device outputs a flash pulse synchronized to a single

frame in the image stream.

–

In the pulsed mode there are two possible pulse configurations:

–

Single pulse during the interframe period when all image lines are exposed. This is

suitable for SCR and IGBT flash configurations. The falling edge of the pulse can

be programmed to vary the width of the pulse.

–

Single pulse over entire integration period of frame. This is suitable for LED flash

configurations.

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