STV0681 datasheet(10/44 Pages) STMICROELECTRONICS

10 / 44 page

Detailed Features

STV0681

10/44

ADCS 7283313C

2.1.1

IR filter

For IR filter design, the best choice filter follows the GS0034 dielectric stack filter specification

available from STMicroelectronics. An alternative, although not optimal filter, would be Schott

S8612 doped glass also sold as CM500.

2.2

User interface

The user interface supported by STV0681 comprises of user controls, buzzer sounds or customized

sounds and visual displays.

2.2.1

Push buttons

The following are the functions which are supported by the chipset. These functions are achievable

with no more than 2 push buttons.

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

Chapter 3.

Shutter button (shutter/confirm action)

This button allows the user to take a picture or confirm an action, as shown in

Chapter 3

The modes of operation are described in

Chapter 3.

It may also be desirable to include an on-off slider switch. The advantages and disadvantages as

well as its exact function are discussed in the reference design available from STMicroelectronics.

When a flashgun module is included in the camera, it is necessary to include a flash on/flash off

push button or slider switch depending on the exact flashgun module design. Possible

implementations are discussed in a separate application note AN1312 available from

STMicroelectronics.

2.2.2

LED indicator

The LED indicator displays the camera status when not in Standby/PC suspend mode.

2.2.3

Picture counter using 2 x 7 segment display

STV0681 stores a picture counter value indicating how many images can still be captured.

STV0681 supports a 2x7 segment LCD panel. In ‘Snapshot’ mode and continuous capture mode,

this LCD panel displays the number of pictures still available. This is useful to identify when the user

is approaching the maximum number of images which can be stored (see

Table 1). The user can

clear the images stored in memory and continue taking pictures. In other modes, this LCD panel

displays a 2-character code that helps the user to navigate around the modes.

Note:

A CIF camera with STV0681 and 64Mbit SDRAM can store up to 320 images by using QCIF mode.

When more than 99 images are still available, the LCD display remains at 99. When the number of

available images is inferior to 99, the LCD display shows how many images are available like in all

other modes.

For suitable numeric LCD panel types, see

Section 4.7.

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