STV0680B datasheet(13/63 Pages) STMICROELECTRONICS

13 / 63 page

Version 3.4

13/63

STV0680B + VV6444/6410/6500

Detailed features

2.2.5

Custom sounds

A camera which includes STV0680B-003 and Audio playback hardware can have a set of custom

sounds downloaded from a PC application. A different sound can be associated with each of the

following functions:

Note: 1 Where a given function has a sound associated with it stored in SDRAM, the piezo buzzer does not

give any beeps for that function. Not all functions need to have custom sounds associated with

them, this is the choice of the user or OEM.

2 A demonstration PC application “CustomSounds” is available from ST, however this is not intended

for end-users. Source code is available which allows the EOM to build their own PC application

using the SDK.

2.3

Battery level detect and USB auto-switch

An on-chip battery level detector on STV0680B detects when the battery voltage falls below a

threshold. This threshold is determined by the designer, dependant on the perception of what

remains as ‘acceptable’ image quality as the battery voltage falls. The chosen threshold level is

determined by a resistor value, as shown in

Chapter 6 Where no USB has been detected, the LCD

display flashes, which indicates that the battery is low. Where a USB connection has been detected,

the camera sources power from USB, if certain additional hardware is fitted.

Note:

It may be a requirement of certain USB compliance tests that such additional hardware is included

in the camera design, in order to enable the camera to switch to supply from USB and hence report

back to the PC while connected to the USB bus without a battery.

2.4

Audio record and playback

2.4.1

Record

A camera which includes STV0680B-003 and a microphone, comparator and other periphery (also

utilizing the sensor pre-amplifier) can be used to record sounds which are stored in the same way

as images. STV0680B-003 will auto-detect the presence of Audio record hardware and include

Power On

Sound delete

Power Off

Continuous clip delete

Good picture

Clear memory

Bad picture

(Normally due to insufficient light)

Confirm action

Memory full

Low power

Self timer #1

Flashgun ON

Self timer #2

Flashgun OFF

Low resolution

Flashgun Trigger

High resolution

Frequency 50kHz

Picture delete

Frequency 60kHz

Table 4 : List of custom sound functions

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