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VV5300 Schematic ( PDF Datasheet ) - ETC

Teilenummer VV5300
Beschreibung Integrated CMOS Image Sensor with on-chip ADC
Hersteller ETC
Logo ETC Logo 




Gesamt 43 Seiten
VV5300 Datasheet, Funktion
VV5300 Sensor
Integrated CMOS Image Sensor with
on-chip ADC.
DISTINCTIVE CHARACTERISTICS
• Standard image format: 160 x 120
• 164 x 124 pixel array
• Variable frame rate (2 fps - 60 fps)
• On-chip 8-bit A/D convertor
• 8-bit and 4-bit conversion modes
• 8-wire and 4-wire parallel data output modes
• Reduced flicker operation with 50Hz and 60Hz
mains frequencies
• 2 serial data output modes
• Automatic exposure and gain controller
• Automatic black level calibration
• Options selectable via serial interface
GENERAL DESCRIPTION
VV5300 is a highly-integrated CMOS image sensing
device. In addition to a 160 x 120 pixel image sensor
array, the device includes on-chip circuitry to drive
and sense the array.
The output stage of the sensor contains a successive
approximation circuit which performs analogue-to-
digital conversion of the photodiode array to produce
8-bit or 4-bit pixel data.
VV5300 features electronic exposure and gain con-
trol over a wide range, enabling the use of a single
fixed-aperture lens.
A bi-directional 2-wire serial communications inter-
face allows the device to be configured and its oper-
ating status monitored. The status information may
also be multiplexed onto the digital output bus.
The primary image size is 160 x 120 but border pix-
els/lines can be enabled to give an effective image
size of 164 x 124.
BLOCK DIAGRAM
VERTICAL
SHIFT
REGISTER
PHOTO DIODE ARRAY
DIGITAL
CONTROL
LOGIC
CLKI CLOCK
CLKO CIRCUIT
SAMPLE & HOLD
VBLTW
VRT
VCM
VREF2V5
VPED/VBG
VCDS
ANALOG
VOLTAGE
REFS.
HORIZONTAL SHIFT REGISTER
A/D CONVERTOR
IMAGE
FORMAT
SDA
SCL
D[7:0]
SIN
FST
QCK
Pixel Resolution
Pixel Size
Array Size
Power Supply
Min.illumination
Power
S/N
Exposure control
Temperature
160 x 120
12µm x 12µm
1.92mm x 1.44mm
5v +/-10%
0.1 Lux
175 mW (Typ.)
36 dB (Typ.)
Automatic (25000:1)
-20oC to +70oC
cd34011-b.fm
17/10/97
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VV5300 Datasheet, Funktion
VV5300 Sensor
Absolute Maximum Ratings
Parameter
Value
Supply Voltage
-0.5 to +7.0 volts
Voltage on other input pins
Temperature under bias
Storage Temperature
-0.5 to VDD + 0.5 volts
-15oC to 85oC
-30oC to 125oC
Maximum DC TTL output Current Magnitude 10mA (per o/p, one at a time, 1sec. duration)
Note: Stresses exceeding the Absolute Maximum Ratings may induce failure. Exposure to absolute
maximum ratings for extended periods may reduce reliability. Functionality at or above these
conditions is not implied.
DC Operating Conditions
Symbol
Parameter
Min.
VDD Operating supply voltage
4.75
VIH Input Voltage Logic “1”
2.4
VIL Input Voltage Logic “0”
-0.5
TA Ambient Operating Temperature 0
Typ.
5.0
Max. Units Notes
5.25 Volts
VDD+0.5
0.8
70
Volts
Volts
oC
Still air
AC Operating Conditions
Symbol
Parameter
CKIN
SCL
Crystal frequency
Serial Data Clock
Min. Typ.
Max.
14.318
100
Units Notes
MHz
KHz
1
2
1. Pixel Clock = CKIN/2
2. Serial Interface clock must be generated by host processor.
Electrical Characteristics
Symbol
Parameter
Min. Typ. Max. Units
IDCC
IADD
Digital supply current
10
Analog supply current
25
Typical conditions, VDD = 5.0 V, TA = 27oC
mA
mA
Notes
1
1
cd34011-b.fm
17/10/97
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6 Page









VV5300 pdf, datenblatt
VV5300 Sensor
Frame Timing
The VV5300 frame rate depends upon:
(i) the frequency of the clock input (CLKI)
(ii) the ADC conversion accuracy
(ii) the internal clock divisor chosen.
Users can set their own values for CLKI, the ADC conversion rate and also the clock divisor setting, subject
to achieving a frame rate up to 60 frames/sec.
The frame rate is determined in the following way:
An example is given with a clock input of 14.318MHz, 160 x120 image format, 8 bit ADC conversion rate and
a clock divisor of 4.
1. Determine clock input (CLKI) frequency - 14.318MHz
2. Pixel period = (Divisor x 8) / CLKI
Example:
Pixel period = (4 x 8) / 14.318MHz = 2.235µs
3. Line period = (no. of active pixels + line overhead) * pixel period
The number of active pixels per line is either 160 or 164. The interline pixel period overhead (including the 4
border pixels that can be enabled to qualify extra video information) is mode dependent, 43 pixel periods for
60fps or 135 pixel periods for 50fps. Refer to figure * for more information.
Example:
Line period = (160 + 43) x 2.235µs = 453.705µs
4. Frame period = (no. of active lines + frame overhead) * line period
For the purposes of calculating the effective frame rate the number of active lines is assumed to be fixed at
120. The frame overhead (which includes the 4 border lines that can be enabled to qualify extra video
information) has a constant value of 27 line periods. Refer to table * for more information.
Example:
Frame period
= (120 + 27) x 453.705µs = 66.694ms
Frame rate
= 1 / frame period
= 15 frames per second
cd34011-b.fm
17/10/97
12

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