STV0974 datasheet(38/69 Pages) STMICROELECTRONICS

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STV0974

Functional description

Once the image is sent, the STV0974 automatically returns to Idle. See

Figure 27.

Idle to Flash In idle mode, white balance must be set to a fixed setting (automatic white balance

setting is not recommended as no convergence is applied) and the “delay transfer mode” must be

set to 0 (no frame delay). When changing to flash mode, the maximum frame rate is automatically

set with respect to data format. The first frame is captured, processed and transferred by the

STV0974. The system automatically goes back to idle mode.

Figure 28 illustrates the timing in flash

mode.

When setting the torch mode, the flash mode should not be used. All the standard operating modes

like ViewFinder, still capture or live operate normally. As an example, the automatic white balance

and exposure control as well as “delay transfer mode” can be active if required.

Figure 27: Viewfinder to capture timing

Figure 28: Flash mode diagram

SCL/SDA

974 mode

MSCL/MSDA

Sensor mode

capture

ViewFinder

Capture in progress

Capture

Video active

Max 1 frame

Max 20 frames

Max 2 frames

Min = 0 frame

Note:

1 If the system exposure and white balance is already stable, the maximum delay is 1 frame.

(

Note 1)

STV0974

output data

VisionLink data

Exposure time

Sensor data

Strobe request

from host

Flash Strobe

pulse (DIO12 pin)

STV0974

data out

Exposure time of pixels is automatically set to maximum exposure time

Strobe pulse width is clipped to a maximum of 8 lines

output

STV0974 数据表(PDF) 38 Page - STMicroelectronics

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