VV6444C001 Ver la hoja de datos (PDF) - Vision

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VV6444C001

Low Cost Digital Camera (LCDC) Chipset

Vision 

STV0680A + VV6444/6410/6500

PRELIMINARY

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

settings for the VV6444 colour set. This means that a VV6404 should not be used with STV0680/680A.

For IR filter design, the best choice filter follows the GS0034 dielectric stack filter specification, which is available from ST. An

alternative, although not optimal filter, would be Schott S8612 doped glass, also sold as CM500.

2.1.2 VV6410

VV6410 is a CIF resolution, 3.3V CMOS imaging sensor. A brief specification is shown in Section 7.

A dual design to support VV6444 and VV6410 is not possible, since VV6410 is a 3v3 sensor. A dual footprint for VV6410 and

VV6500 is not possible since the package types differ, however, the same support circuit is used. See Section 9.

2.1.3 VV6500

VV6500 is a VGA resolution, 3.3V CMOS imaging sensor. A brief specification is shown in Section 7.

A dual design to support VV6444 and VV6500 is not possible, since VV6500 is a 3v3 sensor. A dual footprint for VV6410 and

VV6500 is not possible since the package types differ, however, the same support circuit is used. See Section 9.

2.2 User interface

The user interface supported by STV0680A comprises of user controls, audible signals and visual displays.

! Note The precise functionality of the user interface may vary from that of existing demonstration units. The

version shown here is close to the actual functionality available in STV0680A.

2.2.1 Push buttons

The following are typical of the type of functions which are supported by the chipset. These functions are achievable with no more

than 2 push buttons.

1. Mode button (Wake-up/Switch between modes): This button allows the user (1.1) to wake the camera up from standby mode

when the camera is to be used for taking pictures, or (1.2) to switch between modes of operation shown in Section 3..

2. Shutter button (Shutter/confirm action): This button allows the user to take a picture or confirm an action, as shown in Sec-

tion 3.

The modes of operation are described in Section 3.

2.2.2 LED indicator

An LED display camera status, i.e. to show that the camera is in ‘Snapshot’ mode.

2.2.3 Picture counter using 2 x 7 segment display

STV0680A stores a picture counter value, which shows how many images can still be captured. STV0680A supports a 2x7

segment LCD panel. In ‘Snapshot’ mode and continuous capture mode, this LCD panel displays the number of pictures still

available, which is useful to identify when the user is approaching the maximum number of images which can be stored (see

Table 4 and Table 5). It is possible to clear the images stored in memory, in order to continue taking pictures, as shown in Table

6. In other modes, this LCD panel shows displays a 2-character code as shown in Table 6, which helps the user to navigate

around the modes.

Note: A CIF camera with STV0680A-002 and 64Mbit SDRAM can store up to 320 images by using QCIF mode. Where >99

images are still available, the LCD display will remain at 99. Where (no. of images available) <99, the LCD display will show the

number of images available, as is the case with all other modes.

For suitable numeric LCD panel types, see Section 4.8.

2.2.4 Piezo buzzer

An on-chip Pulse Width Modulator (PWM) on STV0680A is used to generate buzzer sounds to signal certain events. The

following are typical of the type of events which are indicated by the buzzer, and each has its own distinctive sound:

1. Camera has been ‘Woken up’ from standby mode (either by the user pressing a button, by re-connecting the power source,

or by connecting a USB/RS232 connection).

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