STV0974 datasheet(35/69 Pages) STMICROELECTRONICS

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Functional description

STV0974

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Still Mode This mode is used to take still pictures. Still picture parameters can be set for both

image size and data format. the first image output has a guaranteed exposure and color balance.

the number of frames output can also be set.

Live Mode Live clips can be generated in all the data and image formats.

Flash Mode Flash mode is used to take a single still picture and synchronously activate a flash

gun signal and illuminate the scene during the exposure period of the pixels.

Torch Mode For systems without a flash gun, a torch mode can replace the flash mode. Torch

mode is a setting (rather than a mode) which supports illumination of devices by producing a longer

illumination pulse with a lower intensity. In torch mode, illumination is switched on before the

camera is operated in one of the standard operating modes: ViewFinder, still capture or live.

Mode transitions

Boot to sleep The microcore starts following PDN de-activation. The right configuration is

obtained according to the following procedure:

1 Determine the sensor I2C chip address.

2 Read all sensor registers, either through I2C reads or status line interpretation.

3 Initialize internal registers.

The device then automatically goes into sleep mode

Sleep to idle When exiting sleep mode, the external clock register of the sensor is set, and the

sensor goes into Idle mode.

Figure 22: Sleep to idle timing

SCL/SDA

974 Mode

Sleep

Goto VF

MSCL/MSDA

or Goto Live

Sensor Mode

Sleep

Clock Active

CLK from sensor

t0: Time to interpret Mode change command (< 1ms)

t1: Time to set clk characteristics (< 1ms)

t2: Time to get sensor characteristics (< 3ms) to go to idle

Idle

Set

external clock

Go to clk

active

Get sensor

Go to Idle

Clock Active

Idle

characteristics

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