Version 1.4, March 6, 2003
Proprietary to OmniVision Technologies
1
Advanced Information
Preliminary Datasheet
OV7640 Color CMOS VGA (640 x 480) C
AMERA
C
HIPTM
OV7141 B&W CMOS VGA (640 x 480) C
AMERA
C
HIPTM
O
mni
TM
ision
General Description
The OV7640 (color) and OV7141 (black and white)
C
AMERA
C
HIPSTM
are low voltage CMOS image sensors
that provide the full functionality of a single-chip VGA
(640 x 480) camera and image processor in a small
footprint package. The OV7640/OV7141 provides
full-frame, sub-sampled or windowed 8-bit images in a
wide range of formats, controlled through OmniVision's
Serial Camera Control Bus (SCCB) interface.
This product family has an image array capable of
operating at up to 30 frames per second (fps) with
complete user control over image quality, formatting and
output data transfer. All required image processing
functions, including exposure control, gamma, white
balance, color saturation, hue control and more, are also
programmable through the SCCB interface. In addition,
OmniVision C
AMERA
C
HIP
s use proprietary sensor
technology to improve image quality by reducing or
eliminating common lighting/electrical sources of image
contamination such as fixed pattern noise, smearing,
blooming, etc. to produce a clean, fully stable color image.
Features
High sensitivity for low-light operation
2.5V operating voltage for embedded portable
applications
Standard Serial Camera Control Bus (SCCB)
interface
VGA, QVGA (sub-sampled) and Windowed outputs
with Raw RGB, RGB (GRB 4:2:2), YUV (4:2:2) and
YCbCr (4:2:2) formats
Automatic image control functions including:
Automatic Exposure Control (AEC), Automatic Gain
Control (AGC), Automatic White Balance (AWB),
Automatic Brightness Control (ABC), Automatic
Band Filter (ABF) for 60Hz noise and Automatic
Black-Level Calibration (ABLC)
Image quality controls including color saturation,
hue, gamma, sharpness (edge enhancement),
anti-blooming and zero smearing
Ordering Information
Product
Package
OV7640 (Color)
PLCC-28
OV7141 (B&W)
PLCC-28
Applications
Cellular and Picture Phones
Toys
PC Multimedia
Key Specifications
Figure 1 OV7640/OV7141 Pin Diagram
Array Size 640 x 480 (VGA)
Power Supply
Core 2.5VDC + 10%
Analog 2.5VDC + 4%
I/O 2.25V to 3.3V
Power
Requirements
Active 40 mW (30 fps, including
I/O power)
Standby 30 W
Temperature
Range
Operation -10C to 70C
Stable Image 0C to 50C
Output Formats (8-bit)
YUV/YCbCr 4:2:2
RGB 4:2:2
Raw RGB Data
Lens Size 1/4"
Maximum Image
Transfer Rate
VGA 30 fps
QVGA 60 fps
Sensitivity
B&W 3.0 V/Lux-sec
Color 1.12 V/Lux-sec
S/N Ratio 46 dB
Dynamic Range 62 dB
Scan Mode Progressive/Interlaced
Maximum Exposure Interval 523 x t
ROW
Gamma Correction 0.45
Pixel Size 5.6 m x 5.6 m
Dark Current 30 mV/s
Well Capacity 60 Ke
Fixed Pattern Noise < 0.03% of V
PEAK-TO-PEAK
Image Area 3.6 mm x 2.7 mm
Package Dimensions 11.43 mm x 11.43 mm
25
Y0
24
Y1
23
Y2
22
Y3
21
Y4
20
Y5
19
Y6
27
SI
O
_
D
26
SI
O
_
C
28
NC
1
VS
S_
A
2
VD
D
_
A
3
NC
4
NC
12
VD
D
_
I
O
13
CL
K
14
NC
15
R
E
SE
T
16
NC
17
VS
S_
D
18
Y7
5
PWDN
6
NC
7
VREF
8
VDD_C
9
VSYNC
10
HREF
11
PCLK
OV7640/OV7141
2
Proprietary to OmniVision Technologies
Version 1.4, March 6, 2003
OV7640/OV7141
CMOS VGA (640 x 480) C
AMERA
C
HIP
TM
O
mni
ision
Functional Description
Figure 2
shows the functional block diagram of the OV7640/OV7141 image sensor. The OV7640/OV7141 includes:
Image Sensor Array
(640 x 480 resolution)
Timing Generator
Analog Processing Block
A/D Converters
Output Formatter
Digital Video Port
SCCB Interface
Figure 2 OV7640/OV7141 Functional Block Diagram
Output
Formatter
Column Sense Amps
Timing Generator
MUX
MUX
R
G
B
Y
Cb
Cr
VSYNC
PCLK
HREF
Ro
w
S
e
l
e
c
t
CLK
SIO_D
SIO_C
RESET
PWDN
Analog Processing
Windowing
SCCB
Interface
Control
Registers
(To all circuits)
VREF
1.0 f
Y[7:0]
Digital Video
Port
A/D
A/D
Gain
WB
Gamma
Saturation
Hue
Brightness
Data
Formatting
Image Array
(640 x 480)
Functional Description
Version 1.4, March 6, 2003
Proprietary to OmniVision Technologies
3
O
mni
ision
Image Sensor Array
The OV7640/OV7141 C
AMERA
C
HIPS
has an active image
array size of 640 columns x 480 rows (307,200 pixels).
However, the full array contains 652 columns and 486
rows, with the extra 6 rows used for black-level calibration
("Optical Black") and color interpolation information.
Figure 3
shows a cross-section of the image sensor array.
Figure 3 Image Sensor Array
Timing Generator
In general, the timing generator controls these functions:
Array control and frame generation (VGA and QVGA
outputs)
Internal timing signal generation and distribution
Frame rate timing
Automatic Exposure Control (AEC)
External timing outputs (VSYNC, HREF and PCLK)
Analog Processing Block
This block performs all analog image functions including:
Automatic Gain Control (AGC)
Automatic White Balance (AWB)
Image quality controls including:
Color saturation
Hue
Gamma
Sharpness (edge enhancement)
Anti-blooming
Zero smearing
Color Filter
Microlens
Photo Diode
A/D Converters
After the Analog Processing Block, the color channel data
signal is fed to two 8-bit Analog-to-Digital (A/D) converters
via the multiplexers, one for the Y/G channel and one
shared by the CrCb/BR channels. These A/D converters
operate at speeds up to 12MHz, and are fully
synchronous to the pixel rate (actual conversion rate is
related to the frame rate).
In addition to the A/D conversion, this block also has the
following functions:
Digital Black-Level Calibration (BLC)
Optional U/V channel delay
Additional A/D range controls
In general, the combination of the A/D Range Multiplier
and A/D Range Control sets the A/D range and maximum
value to allow the user to adjust the final image brightness
as a function of the individual application.
Output Formatter
This block controls all output and data formatting required
prior to sending the image out.
Digital Video Port
These two bits increase I
OL
/ I
OH
drive current and can be
adjusted as a function of the customer's loading:
SCCB Interface
The Serial Camera Control Bus (SCCB) interface controls
the C
AMERA
C
HIP
operation. Refer to
OmniVision
Technologies Serial Camera Control Bus (SCCB)
Specification
for detailed usage of the serial control port.
4
Proprietary to OmniVision Technologies
Version 1.4, March 6, 2003
OV7640/OV7141
CMOS VGA (640 x 480) C
AMERA
C
HIP
TM
O
mni
ision
Pin Description
Table 1
Pin Description
Pin Number
Name
Pin Type
Function/Description
01
VSS_A
Ground
Analog ground
02
VDD_A
V
DD
Analog VDD
03
NC
--
No connection
04
NC
--
No connection
05
PWDN
Input
Sets device to power down standby mode
06
NC
--
No connection
07
VREF
V
REF
Internal voltage reference (2.3V). Connect to ground through 1F capacitor
08
VDD_C
V
DD
Core VDD
09
VSYNC
Output
Vertical sync output
10
HREF
Output
HREF output
11
PCLK
Output
Pixel clock output
12
VDD_IO
V
DD
I/O VDD
13
CLK
Input
External clock
14
NC
--
No connection
15
RESET
Input
Clears all registers and resets them to their default values.
16
NC
--
No connection
17
VSS_D
Ground
Digital ground
18
Y7
Output
Digital video output bit[7]
19
Y6
Output
Digital video output bit[6]
20
Y5
Output
Digital video output bit[5]
21
Y4
Output
Digital video output bit[4]
22
Y3
Output
Digital video output bit[3]
23
Y2
Output
Digital video output bit[2]
24
Y1
Output
Digital video output bit[1]
25
Y0
Output
Digital video output bit[0]
26
SIO_C
Input
SCCB serial interface clock
27
SIO_D
I/O
SCCB serial interface data I/O
28
NC
--
No connection
Electrical Characteristics
Version 1.4, March 6, 2003
Proprietary to OmniVision Technologies
5
O
mni
ision
Electrical Characteristics
NOTE:
Exceeding the Absolute Maximum ratings shown above invalidates all AC and DC electrical specifications and may
result in permanent device damage.
Table 2
Absolute Maximum Ratings
Ambient Storage Temperature
-40C to +125C
Supply Voltages (with respect to Ground)
V
DD-A
3V
V
DD-C
3V
V
DD-IO
4V
All Input/Output Voltages (with respect to Ground)
-0.3V to VDD_IO+1V
Lead Temperature, Surface-mount process
+230C
ESD Rating, Human Body model
2000V
Table 3
DC Characteristics (0C < T
A
< 70C)
Symbol
Parameter
Condition
Min
Typ
Max
Unit
V
DD-A
DC supply voltage Analog
--
2.40
2.5
2.60
V
V
DD-C
DC supply voltage Core
--
2.25
2.5
2.75
V
V
DD-IO
DC supply voltage I/O
--
2.25
--
3.3
V
I
DDA
Active (Operating) Current
See Note
a
a. V
DD-A
= V
DD-C
= 2.5V, V
DD-IO
= 3.0V
I
DDA
=
{I
DD-IO
+ I
DD-C
+ I
DD-A
}, f
CLK
= 24MHz at 30 fps, no I/O loading
15
mA
I
DDS-SCCB
Standby Current
See Note
b
b. V
DD-A
= V
DD-C
= 2.5V, V
DD-IO
= 3.0V
I
DDS:SCCB
refers to a SCCB-initiated Standby, while I
DDS:PWDN
refers to a PWDN pin-initiated Standby
1
mA
I
DDS-PWDN
Standby Current
10
A
V
IH
Input voltage HIGH
CMOS
0.7 x V
DD-IO
V
V
IL
Input voltage LOW
0.3 x V
DD-IO
V
V
OH
Output voltage HIGH
CMOS
(I
OH
/ I
OL
)
0.9 x V
DD-IO
V
V
OL
Output voltage LOW
0.1 x V
DD-IO
V
I
OH
Output current HIGH
See Note
c
c.
Standard Output Loading = 25pF, 1.2K
to 3V
8
mA
I
OL
Output current LOW
15
mA
I
L
Input/Output Leakage
GND to V
DD-IO
1
A
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