TC5747 Datasheet, PDF (13/44 Pages) List of Unclassifed Manufacturers – Single Chip CMOS Imager with Integrated Image Signal Processor and JPEG Codec

TC5747 Preliminary Data Sheet
Single Chip CMOS Imager
2.7 Imager and Address Generator
The imager includes a VGA size pixel array, gain, double sampling, black pixel and readout circuits and
ADC. The address generator receives timing signals from the control unit and produces the sequence signals
to the pixel array for exposure control, read and reset operations. There are several modes of reading the
array content, enabling various image resolutions by windowing and by down sampling. At different modes,
various modes of power saving are used. VGA sized images can be read at a rate of up to 20 frames per
second. For smaller images at higher frame-rates, several working modes are implemented.
2.8 Pixel Array Configuration
The pixel array is 648 by 487 active pixels, surrounded by four black columns on each side and 13 black
lines above and 14 black lines below the active image array. This results in a total of 656 by 514 pixels.
2.9 Bayer Grid Configuration
Each pixel in the array is covered by a color filter, to create a Bayer grid format:
The sensor operates in rolling mode, in which the exposure and readout processes are linked. The sampling
of each row data is performed at the end of the integration time. After sampling the selected-row data, the
row is reset. The row is sampled again after the reset for the double-sampling procedure. The integration of
that row starts again according to the exposure parameters.
A set of registers defines the total size of the frame and the size of the array that is read out and sent to the
YUVR unit for further processing. Another set of registers defines the exposure time that is required for the
array.
Figure 2: Bayer Grid Configuration
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