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OV7141 Schematic ( PDF Datasheet ) - OmniVision Technologies

Teilenummer OV7141
Beschreibung (OV7141 / OV7640) B/w Vga 640 X 480 Digital CMOS Camerachipstm
Hersteller OmniVision Technologies
Logo OmniVision Technologies Logo 




Gesamt 20 Seiten
OV7141 Datasheet, Funktion
Omni
ision
TM
Advanced Information
Preliminary Datasheet
OV7640 Color CMOS VGA (640 x 480) CAMERACHIPTM
OV7141 B&W CMOS VGA (640 x 480) CAMERACHIPTM
General Description
The OV7640 (color) and OV7141 (black and white)
CAMERACHIPSTM 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 CAMERACHIPs 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
OV7640 (Color)
OV7141 (B&W)
Package
PLCC-28
PLCC-28
Applications
• Cellular and Picture Phones
• Toys
• PC Multimedia
Key Specifications
Power Supply
Power
Requirements
Temperature
Range
Array Size
Core
Analog
I/O
Active
Standby
Operation
Stable Image
Output Formats (8-bit)
Lens Size
Maximum Image
VGA
Transfer Rate
QVGA
Sensitivity
B&W
Color
S/N Ratio
Dynamic Range
Scan Mode
Maximum Exposure Interval
Gamma Correction
Pixel Size
Dark Current
Well Capacity
Fixed Pattern Noise
Image Area
Package Dimensions
640 x 480 (VGA)
2.5VDC + 10%
2.5VDC + 4%
2.25V to 3.3V
40 mW (30 fps, including
I/O power)
30 µW
-10°C to 70°C
0°C to 50°C
• YUV/YCbCr 4:2:2
• RGB 4:2:2
• Raw RGB Data
1/4"
30 fps
60 fps
3.0 V/Lux-sec
1.12 V/Lux-sec
46 dB
62 dB
Progressive/Interlaced
523 x tROW
0.45
5.6 µm x 5.6 µm
30 mV/s
60 Ke
< 0.03% of VPEAK-TO-PEAK
3.6 mm x 2.7 mm
11.43 mm x 11.43 mm
Figure 1 OV7640/OV7141 Pin Diagram
4 3 2 1 28 27 26
PWDN
5
NC 6
VREF
7
VDD_C
8
VSYNC
9
HREF 10
PCLK 11
OV7640/OV7141
25 Y0
24 Y1
23 Y2
22 Y3
21 Y4
20 Y5
19 Y6
12 13 14 15 16 17 18
Version 1.4, March 6, 2003
Proprietary to OmniVision Technologies
1






OV7141 Datasheet, Funktion
OV7640/OV7141 CMOS VGA (640 x 480) CAMERACHIP
Omni ision
Table 4
Functional and AC Characteristics (0°C < TA < 70°C)
Symbol
Parameter
Min
Functional Characteristics
A/D Differential Non-Linearity
A/D Integral Non-Linearity
AGC
Range
Red/Blue Adjustment Range
Inputs (PWDN, CLK, RESET)
fCLK Input Clock Frequency
tCLK Input Clock Period
tCLK:DC
Clock Duty Cycle
tS:RESET
Setting time after software/hardware reset
tS:REG
Settling time for register change (10 frames required)
SCCB (SIO_C and SIO_D - see Figure 4)
10
100
45
fSIO_C
Clock Frequency
tLOW
Clock Low Period
1.3
tHIGH
Clock High Period
600
tAA SIO_C low to Data Out valid
100
tBUF Bus free time before new START
1.3
tHD:STA
START condition Hold time
600
tSU:STA
START condition Setup time
600
tHD:DAT
Data-in Hold time
0
tSU:DAT
Data-in Setup time
100
tSU:STO
STOP condition Setup time
600
tR, tF
SCCB Rise/Fall times
tDH Data-out Hold time
50
Outputs (VSYNC, HREF, PCLK, and Y[7:0] - see Figure 5, Figure 6, and Figure 7)
tPDV
tSU
tHD
tPHH
tPHL
PCLK[] to Data-out Valid
Y[7:0] Setup time
Y[7:0] Hold time
PCLK[] to HREF[]
PCLK[] to HREF[]
15
8
0
0
AC
Conditions:
VDD:
VDD-A = VDD-C = 2.5V, VDD-IO = 3.3V
Rise/Fall Times: I/O: 5ns, Maximum
SCCB: 300ns, Maximum
Input Capacitance: 10pf
Output Loading: 25pF, 1.2Kto 3V
fCLK:
24MHz
6 Proprietary to OmniVision Technologies
Typ Max Unit
+ 1/2
LSB
+ 1 LSB
21 dB
12 dB
24 27 MHz
42 37 ns
50 55 %
1 ms
300 ms
400 KHz
µs
ns
900 ns
µs
ns
ns
µs
ns
ns
300 ns
ns
5 ns
ns
ns
5 ns
5 ns
Version 1.4, March 6, 2003

6 Page









OV7141 pdf, datenblatt
OV7640/OV7141 CMOS VGA (640 x 480) CAMERACHIP
Table 5
SCCB Register List
Address Register Default
(Hex)
Name
(Hex)
R/W
14 COMC 04
RW
Description
Common Control C
Bit[7:6]: Reserved
Bit[5]: Output Format – Resolution
0: VGA (640x480)
1: QVGA (320x240)
Bit[4]: Reserved
Bit[3]: Data Format – HREF Polarity
0: HREF Positive
1: HREF Negative
Omni ision
15 COMD 00
16 RSVD XX
17 HSTART 1A
18 HSTOP BA
19 VSTRT 03
1A VSTOP F3
1B PSHFT 00
1C MIDH 7F
1D MIDL A2
1E RSVD XX
POS
NEG
Bit[2:0]: Reserved
Common Control D
Bit[7]: Data Format – Output Flag Bit Disable
0: Frame = 254 data bits (00/FF = Reserved flag bits)
1: Frame = 256 data bits
Bit[6]: Data Format – Y[7:0]-PCLK Reference Edge
RW
0: Y[7:0] data out on PCLK falling edge
1: Y[7:0] data out on PCLK rising edge
Bit[5:1]: Reserved
Bit[0]: Data Format – UV Sequence Exchange
0: V Y U Y V Y U Y
1: U Y V Y U Y V Y
Note: Bit[0] is not programmable on the B&W OV7141.
– Reserved
RW Output Format – Horizontal Frame (HREF Column) Start
RW Output Format – Horizontal Frame (HREF Column) Stop
RW Output Format – Vertical Frame (Row) Start
RW Output Format – Vertical Frame (Row) Stop
Data Format – Pixel Delay Select
RW (Delays timing of the Y[7:0] data relative to HREF in pixel units)
• Range: [00] (No delay) to [FF] (256 pixel delay)
R Manufacturer ID Byte – High (Read only = 0x7F)
R Manufacturer ID Byte – Low (Read only = 0xA2)
– Reserved
12 Proprietary to OmniVision Technologies
Version 1.4, March 6, 2003

12 Page





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