OV7620 datasheet(39/60 Pages) ETC

39 / 60 page

OV7620 Product Specifications - Rev. 1.2 (5/13/00)

OMNIVISION TECHNOLOGIES INC.

Preliminary Company Confidential

U6-U0: U channel digital output offset adjustment. Range: +128mV ~ -128mV. If register 27 bit 2=0, this

SCCB has no effect. If register 27 bit 2=1, U channel offset adjustment will use the register

stored value which can be changed by SCCB. If register 26 bit 1=1, this register has no effect

to A/D output data. If output RGB raw data, this register will adjust R/G/B data.

U7: Offset adjustment direction: 0 - Add U[6:0]; 1 -Subtract U[6:0].

If register 2D bit 0 = 0, this register has no function.

CC7 - CC6: Crystal amplifier current gain. (00) maximum current; (11) minimum current

CC5 ~ CC0: Reserved

Registers 24 and 25 together control the AEC target values for image brightness.

For a brighter image, increase register 24 and decrease register 25.

For a darker image, decrease register 24 and decrease reister 25.

AEW7-AEW0 - used to calculate the white pixel ratio. OV7620 AEC algorithm counts the whole field/frame

white pixel (its luminance level is higher than a fixed level) and black pixel (its luminance level

is lower than a fixed level) number. When white/black pixel ratio is same as the ratio defined

by registers [25] and [26], image stable. This register is used to define the white pixel ratio,

default is 25%, each LSB represent step: Interlaced: 1.3%; Progressive Scan: 0.7%. Change

range is: Interlaced: [01] ~ [4A]; Progressive Scan: [01] ~ [96]. Increase AEW<7:0> will

increase the white pixel ratio. For same light condition, the image brightness will increase if

AEW<7:0> increase.

Note: AEW<7:0> must combined with register [26] AEB<7:0>. Keep the relation always true: AEW<7:0> +

AEB<7:0> > [4A] for Interlaced; AEW<7:0> + AEB<7:0> > [90].

Bits

Default

Bits

CC7

CC6

CC5

CC4

CC3

CC2

CC1

CC0

Default

Bits

AEW7

AEW6

AEW5

AEW4

AEW3

AEW2

AEW1

AEW0

Interlace

Progressive Scan

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