VV5300 데이터 시트보기 (PDF) - Vision

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VV5300

Integrated CMOS Image Sensor with on-chip ADC.(Sensor)

Vision 

VV5300 Sensor

Main Features

On-chip 8-bit successive approximation analogue-to-digital convertor with 8-wire, 4-wire parallel and two

serial data output modes.

The default image format is 160x 120. Extra border pixel/lines can be enabled to give an image size of 164

x 124. Digital pixel data coding assigns 10H as black and F0H as white. Other codes specify line sync and

frame sync periods.

The VV5300 frame rates can be integer multiples of the mains supply frequencies used worldwide, i.e. 50Hz

and 60Hz. This ensures reduced flicker operation of the sensor

All VV5300 operating modes and system status information can be accessed via a two wire bidirectional

serial interface.

VV5300 features an automatic electronic exposure algorithm that enables the use of a single fixed-aperture

lens. Automatic gain control enhances operation under low light conditions.

Automatic black level control ensures consistent picture quality across the whole range of operating

conditions. Extensive use of automated operation and on chip references means that only a small number of

passive components are needed to realise a complete video camera.

On-chip voltage references simplifies the support circuitry and maintains device stability over a wide range

of operating conditions.

This device is also available with bayer pattern colour filters (VV6300), see seperate datasheet.

Exposure Control

With automatic exposure control selected VV5300 uses a complex algorithm to automatically set the

exposure value for the current scene. When combined with clock control and gain control the VV5300 can

operate over a very wide range of illumination levels.

Where direct control of the exposure is required the exposure value can be directly selected by writing to the

appropriate registers via the serial interface.

Clock Control

The system clock can be divided down internally to extend the operating range of VV5300 by allowing longer

exposure times. The clock divisor can be varied from 2 to 16 in times two steps i.e there are 4 different values.

Note: changing the system clock divisor modifies the pixel and frame rate.

Gain Control

If the image is to dark and the exposure is already close to its maximum, VV5300 will increase the system

gain.

Gain can be varied from x1 to x8 in times two steps i.e there are 4 different gain settings. If the scene is too

dark and integration period has almost reached its maximum value the gain value is incremented by one step

(i.e. doubled). If the gain setting changes the exposure value is automatically set to half the maximum

integration period. The exposure controller then increases the exposure value as necessary.

Similarly if the image is too bright and the integration period is short then gain will be reduced by one step

(i.e. divide by two). As before, the exposure value is set to half the maximum integration period. The exposure

controller can then adjust the exposure value as necessary to provide a correctly exposed image.

cd34011-b.fm

17/10/97

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