STV-DCASLASHVGA-E01 datasheet(16/60 Pages) STMICROELECTRONICS

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PRELIMINARY

Digital Camera Chipset; Customer Datasheet, Rev 3.0, March 2000

STV0680A + VV6444/6410/6500

CDSTV0680F-C

Commercial in confidence

STV0680F_contents.fm

3.5.2

Description

The LCD displays “CL”. Pressing shutter button twice will clear all the images in the camera.

3.5.3

Exiting this mode

After 5 seconds of non-activity, or after the camera has been cleared, the camera returns to standby mode.

3.6

‘Change resolution’

3.6.1

Entering this mode

This is enabled using the mode button (from ‘Snapshot’ mode, press four times).

Note: In STV0680-001, the images stored in memory must be cleared before this mode can be entered. This is because in

STV0680-001, mixed resolutions (i.e. ‘High’ and ‘Low’) cannot be stored at the same time.

3.6.2

Description

The LCD displays the target resolution to which the camera can be changed, i.e. if in High resolution “Lr” (Low resolution) is

displayed, if in Low resolution, “Hr” (High resolution) is displayed. ‘High’ resolution stores the full image resolution from the sensor

array, while ‘Low’ subsamples the sensor array, to store 4x the number of images (e.g. 80 in QCIF mode, compared to 20 in CIF

mode).

Dependant on the type of sensor used, different resolutions are obtained, see Table 4 or Table 5. By pressing the shutter button,

user changes the resolution.

3.6.3

Exiting this mode

After 5 seconds of non-activity, or after the resolution has been changed, the camera returns to standby mode.

3.7

Tethered USB Video mode

3.7.1

Entering this mode

This is activated by the PC Video for Windows driver while the camera is tethered, dependant on whether VfW is supported (see

Table 3).

3.7.2

Description

The camera is controlled by the PC driver.

Note: Any images or continuous image sequences contained in the camera are lost when the video for Windows driver starts.

3.7.3

Exiting this mode

This is controlled by the PC drivers.

3.8

Powering the camera off

3.8.1

Entering this mode

This is not truly a mode of operation, but a description of what happens if:

•

The battery power and USB connection are removed from the camera

•

The battery power is removed, and the PC to which the camera is tethered, is switched off.

•

The battery voltage falls extremely low. Ways of avoiding this situation are discussed in the reference design, see Section 9.

Note: normally a camera with USB interface should source power from the USB connection, but this is hardware dependant, see

Section 9.

3.8.2

Description

In this situation, all image data is lost.

Note: under certain circumstances, the image data may be maintained if the camera or PC is powered on again after a few

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