VV5430 Datasheet, PDF (2/32 Pages) List of Unclassifed Manufacturers – Integrated CMOS Image Sensor with support for ADC and external control via serial interface

VISION V V 5430 Sensor
MAIN FEATURES
The VV5430 delivers a fully-formatted
composite monochrome video signal. Stand-
ards options include EIA (320 x 244) and
CCIR (384 x 287). On chip signal conditioning
allows user-selection of linear or gamma-
corrected output.
Different operational modes can be selected
dynamically via the external interface or
configured at power up by tying the appro-
priate pins. Extensive use of automated oper-
ation and on chip references means that only
a small number of passive components are
needed to realise a complete video camera.
Video Output
The integrated 75Ω driver eliminates the need
for additional active components to drive
standard loads, including double terminated
lines.
The video signal can also be inhibited by
setting the output to a high impedance state
(‘Tristated’), which enables multiplexing of a
number of different sensors. This, together
with vertical and horizontal ‘shuffle’ modes,
means that four sensor images can be shown
simultaneously on one display.
Frame, line and pixel timing signals are
provided to facilitate pixel locked digitisation
of the analog video data. In addition to the
these outputs a synchronisation input (SIN) is
also provided to allow the start of frame to be
synchronised to an external event.
Automatic Exposure and Gain Control
The VV5430 features automatic exposure
control that allows a single fixed-aperture lens
to be used, and incorporates Normal and
Backlit modes to give operation over a wide
range of scene types. The system clock
frequency can also be reduced to provide
increased sensitivity.
Serial Interface
A bi-directional serial interface allows an
external controller to set operational parame-
ters and control exposure and gain values
directly. The host can also interrogate
VV5430 via the serial interface to determine
the camera’s operating modes and current
state. This allows alternative automatic expo-
sure and other control algorithms to be run in
an external controller if the integrated
versions are not suitable.
The VV5430 receives and transmits control
and parametric data via a full duplex, two-wire
serial interface. The host is communications
master, with the camera either a slave
receiver or transmitter. Messages consist of
either three or five bytes of 8-bit data, with a
maximum serial clock frequency of 100kHz.
Since the serial clock is generated by the
host, the host determines the data transfer
rate.
Contents
Main Features
Specifications
Pin List
Video Standards
Image Digitisation
Shuffle Modes
Exposure Control
Serial Communication
Read Data from Camera
Write to Camera
Example Support Circuit
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09/04/97