STV0974 datasheet(37/69 Pages) STMICROELECTRONICS

37 / 69 page

Functional description

STV0974

37/61

Viewfinder to live/ Live to viewfinder The sensor field and frame lengths are set according to the

user defined Live/Capture frame rate and data output format. The latency of this transition is

minimal. See

Figure 25 below.

Idle to capture Data is grabbed as fast as possible for exposure and white balance convergence.

When the system is stable (or timed-out), the user settings are sent to the sensor. See

Figure 26.

Viewfinder to capture Two cases can occur:

1 The system (exposure, white balance) is already stable in viewfinder mode. The user settings

are sent to the sensor. The processed frame is sent after a short latency.

2 The system has not stabilized. STV0974 enters transient mode and, when stable, automatically

goes into Capture mode.

Figure 25: Viewfinder to live or live to viewfinder

Figure 26: Idle to capture timing

SCL/SDA

974 Mode

Goto

MSCL/MSDA

Sensor Mode

Video Active

VF or Live

STV0974

output data

other streaming

mode

Live/VF

1 frame max.

2 frames max.

SCL/SDA

974 mode

Output link

MSCL/MSDA

Sensor mode

Input link

capture

Idle

Capture in progress

Capture

Video active

3 ms max.

Max = 20 frames @ maximum frame rate max 2 frames

Mean ~8 frames

Min. = 1 frame

Idle

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