VS6524 datasheet(12/70 Pages) STMICROELECTRONICS

12 / 70 page

System architecture

VL6524/VS6524

12/70

3.2

Microprocessor functions

The microprocessor inside the VL6524/VS6524 performs the following tasks:

Host communication: handles the I²C communication with the host processor.

Video pipe configuration: configures the video pipe modules to produce the output

required by the host.

Automatic exposure control: In normal operation the VL6524/VS6524 determines the

appropriate exposure settings for a particular scene and outputs correctly exposed images.

Flicker cancellation: The 50/60Hz flicker frequency present in the lighting (due to

fluorescent lighting) can be cancelled by the system.

Automatic white balance: The microprocessor adjusts the gains applied to the individual

color channels in order to achieve a correctly color balanced image.

Dark calibration: The microprocessor uses information from special dark lines within the

pixel array to apply an offset to the video data and ensure a consistent ‘black’ level.

Active noise management: The microprocessor is able to modify certain video pipe

functions according to the current exposure settings determined by the automatic exposure

controller. The main purpose of this is to improve the noise level in the system under low

lighting conditions. Functions which ‘strength’ is reduced under low lighting conditions (e.g.

sharpening) are controlled by ‘dampers’. Functions which ‘strength’ is increased under low

lighting conditions are controlled by ‘promoters’. The fade to black operation is also

controlled by the microprocessor

VS6524 データシート(PDF) 12 Page - STMicroelectronics