Version 1.4, March 21, 2003

Proprietary to OmniVision Technologies

Advanced Information

Preliminary Datasheet

OV7910 Color CMOS NTSC/PAL C

AMERA

HIPTM

OV7411 B&W CMOS NTSC/PAL C

AMERA

HIPTM

mni

ision

General Description

The OV7910 (color) and OV7411 (black and white) single
chip CMOS C

AMERA

HIPSTM

are designed to provide a

high level of functionality in a small footprint package.
Both devices support NTSC/PAL composite video and
S-Video. The OV7910 imager also provides RGB and
YCbCr video signals, and each device directly interfaces
with a VCR TV monitor or other 75 ohm terminated input.
A minimal number of external components are required to
complete a fully functional camera subsystem. The
OV7910/OV7411 video cameras require only a single
5-volt DC supply and have been designed for very low
power operation. These products are ideal for all
applications requiring a small footprint, low voltage, low
power and low cost color or black and white video camera.

Features

Single chip 1/3" format video camera

PAL with 628 x 582 pixels or NTSC with
510 x 492 pixels.

Composite video:

NTSC

S-Video

Component video RGB or YUV

Sensitivity boost (+18 dB)/AGC ON/OFF

Automatic exposure/gain/white balance

External frame sync capability

Aperture correction

SCCB programmable controls:

Color saturation

Brightness

Contrast

White balance

Exposure time

Gain

Gamma correction (0.45) ON/OFF

Low power consumption

+5 volt only power supply

Ordering Information

Product

Package

OV7910 (Color, NTSC/PAL)

CLCC-48

OV7411 (B&W, NTSC/PAL)

CLCC-48

Applications

Automotive

PC Multimedia

Toys

Security

Surveillance

Video phones

Video conference equipment

Key Specifications

Figure 1 OV7910/OV7411 Pin Diagram

Array Size

PAL 628 x 582

NTSC 510 x 492

Power Supply 5 VDC + 5%

Power Requirements 200 mW

Image Area

PAL 5.78 mm x 4.19 mm

NTSC 4.69 mm x 3.54 mm

Auto Electronic Exposure Time 1/60s to 1/2000s

Lens Size 1/3"

Min. Illumination

(3000K)

OV7910 < 5 Lux

OV7411 < 1 Lux

S/N Ratio 40 dB

Pixel Size 9.2 µm x 7.2 µm

Fixed Pattern Noise < 0.03% V

Package Dimensions .560 in. x .560 in.

FSI

PWDN

AMOD0

AMOD1

HSHP

DEVDD

DEGND

VAXPXO

VHSYNC/MIR

FSO/VSFR

FODD/I2CEN

PALSW

13 EVDD

12 SMTAWB

11 RSVD11

10 HSAT

CEXP

RGSW

AVDD

18 OVDD

17 RVCVO

16 GYYO

15 BVCO

14 EGND

OV7910/OV7411

Functional Description

Version 1.4, March 21, 2003

Proprietary to OmniVision Technologies

mni

ision

Video Standards

Two TV standards are implemented and available as
output in the OV7910/OV7411 imaging devices,
NTSC (M) and PAL (B).

Table 1

shows how to configure

the standard of choice. Note that the accuracy and
stability of the crystal clock frequency is important to avoid
unwanted color shift in TV video system.

Video Formats

The OV7910/OV7411 image sensors support a variety of
formats including Composite (CVBS), S-Video (YO/CO),
RGB components, and YUV components. Composite and
S-Video signals are generated from the internal TV
encoder and RGB/YUV outputs are generated form the
color matrix prior to entering the encoder. The image
sensor utilizes the RG/BG Bayer pattern, sending raw
pixel data through the color matrix, creating RGB or YUV
component signals. At the same time, YUV signals are
also processed to generate both composite and S-video
signals. Note that color format configuration is valid only
for the OV7910 image sensor.

Composite and S-Video

The Composite/S-Video format is the power-up default
configuration for the OV7910/OV7411 image sensors.

AMOD0

(pin 38) and

AMOD1

(pin 39) select composite

and S-video formats. In this configuration,

RVCVO

(pin 17) outputs the YO component of the S-video signal
and

BVCO

(pin 15) outputs the CO component.

Table 2

summarizes the available formats and the settings
required on the appropriate pins.

RGB Format

Setting AMOD0 = 1 (with AMOD1 = x) selects the RGB
format. In this configuration,

RVCVO

outputs the RED

component,

GYYO

outputs the GREEN component and

BVCO

provides the BLUE component.

Table 1

Standard Configurations

Standard

PAL Setting

(Pin 24)

Clock

Comments

NTSC

14.31818 MHz

Clock in =

4 x F

PAL

17.734475 MHz

Clock in =

4 x F

YUV Format

Setting

AMOD0

= 0 and

AMOD1

= 1 configures the

OV7910/OV7411 sensors to operate in YUV mode or
B&W mode. In this configuration,

GYYO

outputs the Y

component,

RVCVO

provides the Cr component, and

BVCO

outputs the Cb component. On the OV7411 image

sensor, only the

GYYO

(Y component) output is valid.

Configuring the OV7910/OV7411

The OV7910/OV7411 sensors are designed for
ease-of-use in many standalone applications. Most of the
on-chip functions are configurable by connecting
appropriate pins high (logic "1") or low (logic "0") using a
10K

resistor. The image sensor reads the input pins at

power up which enable user-defined default
configurations.

The OV7910/OV7411 sensors also contain a Serial
Camera Control Bus (SCCB) interface for programmable
access to all register functions. For further details on the
SCCB port, see

"Serial Camera Control Bus (SCCB)" on

page 4

. By default, the SCCB interface is disabled. To

enable the SCCB interface for controlling the sensor, a
10K

. pull-up resistor must be connected to the

FODD/I2CEN

pin (pin 34). With the FODD/I2CEN pin

pulled high at power-up, the OV7910/OV7411 image
sensors will enable the SCCB port for access.

White Balance

The White Balance function in the OV7910/OV7411
image sensor is used to adjust and calibrate the image
device sensitivity on the primary (RGB) colors to match
the color cast of the light source. The Auto White Balance
(AWB) can be enabled or disabled through either the

AWBEN

pin (pin 29) or through the SCCB port. If AWB is

enabled, the image sensors continuously perform white
balancing. A fast or slow mode of white balancing may be
user-selected through the

AWBTM

pin (pin 30). Fast AWB

updates color every 2 fields while slow AWB updates
every 16 fields.

By using the SCCB port, the color temperature may be
further fine tuned to the requirement of the application.
Note that the "blue" (

BLUE

and

BBS

registers) and "red"

(

RED

and

RBS

registers) bias control are only available

through the SCCB port. This function enables the user to
define a "cooler" or "warmer" background for image
capture.

Proprietary to OmniVision Technologies

Version 1.4, March 21, 2003

OV7910/OV7411

CMOS NTSC/PAL C

AMERA

HIP

mni

ision

Table 2

Video Format Options

Format Type

RVCVO (Pin 17)

GYYO (Pin 16)

BUCO (Pin 15)

Pin Settings

Composite/S-Video

CVBS

AMOD0 = 0, AMOD1 = 0

RGB Component

RED

GREEN

BLUE

AMOD0 = 1, AMOD1 = x

YUV Component

AMOD0 = 0, AMOD1 = 1

Black and White

AMOD0 = 0, AMOD1 = 1

Note: Pins 15 and 17 are undefined
in the OV7411 sensor.

Additional Picture Control

A number of functions/registers are available which
enable the user to configure OV7910/OV7411 image
capturing parameters. These functions include Automatic
Gain Control (AGC), AGC Gain, Automatic Exposure
Control (AEC), GAMMA, and Backlight control.

AGC Gain can be set at 2x normal by programming pin 20,

HGAIN

. This function may be configured through the

SCCB port as well.

GAMMA

(pin 27) can be used to set

the color correction.

BKLT

(pin 21) controls how the

OV7910/OV7411 image sensors manage backlight
conditions. These functions may also be controlled by the
SCCB interface.

At power up, AGC and AEC are enabled. AGC can be
disabled at power-up by configuring the

AGCEN

(pin 28) as required. AEC cannot be enabled/disabled
externally and must be programmed through the SCCB
port.

Other Image Sensor Control Functions

Additional programmable functions for OV7910/OV7411
image sensors include sharpness adjustment, brightness
level fine tune, color saturation adjustment, hue
adjustment. All these functions (except for power down)
can be configured by either an external pin or through the
SCCB interface.

Serial Camera Control Bus (SCCB)

Many of the functions and configuration registers in the
OV7910/OV7411 image sensors are available through the
SCCB interface. The SCCB port is enabled by asserting
the I2CEN line (pin 34, see

"FODD/I2CEN" on page 8

)

through a 10K

resistor to V

. When the SCCB

capability is enabled (I2CEN = 1), the OV7910/OV7411
image sensor operates as a slave device that supports up
to 400 kbps serial transfer rate using a 7-bit address/data
transfer protocol.

NOTE: When the SCCB interface is enabled, the
OV7410/OV7411 will output in color by default. To output
in B&W mode, set register

COMB

[1:0] = 10b.

SCCB Protocol Format

In SCCB operation (see

Figure 5

), the master must

perform the following operations:
·

Generate the Start/Stop condition

Provide the serial clock on SCL

Place the 7-bit slave address (RW bit) and the 8-bit
sub-address on SDA

The receiver must pull down

SDA

during the

acknowledgement bit time. During the write cycle, the
OV7910/OV7411 device returns the acknowledgement
and, during the read cycle, the master returns the
acknowledgement, indicating to the slave that the read
cycle can be terminated. Note that the restart feature is
not supported here.

Within each byte, the MSB is transferred first. The
read/write control bit is the LSB of the first byte. Standard
SCCB communications require only two pins,

SCL

and

SDA

. SDA is configured as an open drain for bidirectional

purposes. A HIGH to LOW transition on the SDA while
SCL is HIGH indicates a START condition. A LOW to
HIGH transition on the SDA while SCL is HIGH indicates
a STOP condition. Only a master can generate
START/STOP conditions.

Except for these two special conditions, the protocol that
SDA remain stable during the HIGH period of the clock,
SCL. Each bit is allowed to change state only when SCL
is LOW (see

Figure 3

and

Figure 4

The OV7910/OV7411 SCCB interface supports multi-byte
write and multi-byte read. The master must supply the
sub-address in the write cycle, but not in the read cycle.
Therefore, the OV7910/OV7411 takes the read
sub-address from the previous write cycle. In multi-byte
write or multi-byte read cycles, the sub-address
automatically increments after the first data byte so that

Functional Description

Version 1.4, March 21, 2003

Proprietary to OmniVision Technologies

mni

ision

continuous locations can be accessed in one bus cycle. A
multi-byte cycle overwrites its original sub-address;
therefore, if a read cycle immediately follows a multi-byte
cycle, a single byte write cycle that provides a new
address must be inserted.

The OV7910/OV7411 supports a single slave ID. The ID
is preset to 80 for write and 81 for read.

In the write cycle, the second byte in the SCCB is the
sub-address for selecting the individual on-chip registers,
and the third byte is the data associated with this register.
Writing to the unimplemented sub-address is ignored.

In the read cycle, the second byte is the data associated
with the previously stored sub-address. Reading of an
unimplemented sub-address returns unknown.

Figure 3 Bit Transfer on the SCCB

DATA

SDA

SCL

STABLE

CHANGE

ALLOWED

Figure 4 Data Transfer on the SCCB

Figure 5 SCCB Protocol Format

SDA

SCL

SLAVE ID

SUB-ADDRESS

DATA

SUB-ADDRESS (8-BIT)

DATA (8-BIT)

SLAVE (7-BIT)

STOP

ACK

LSB=0

MSB

START

FIRST BYTE

SECOND BYTE

THIRD BYTE

MASTER TRANSMIT, SLAVE RECEIVE (WRITE CYCLE)

SUB-ADDRESS (8-BIT)

SLAVE (7-BIT)

STOP

ACK

LSB=0

MSB

START

FIRST BYTE

SECOND BYTE

MASTER TRANSMIT, SLAVE RECEIVE (DUMMY WRITE CYCLE)

DATA (8-BIT)

SLAVE (7-BIT)

STOP

NO ACK IN

ACK

LSB=1

MSB

START

FIRST BYTE

SECOND BYTE

THIRD BYTE

MASTER RECEIVE, SLAVE RECEIVE (READ CYCLE)

LAST BYTE

SLAVE TRANSMIT

MASTER TRANSMIT

MASTER INITIATE

S START CONDITION

A ACKNOWLEDGE BIT

P STOP CONDITION

SLAVE ID 1000000X

X RW BIT, 1: READ, 0: WRITE

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