TC5747 Datasheet, PDF (14/44 Pages) List of Unclassifed Manufacturers – Single Chip CMOS Imager with Integrated Image Signal Processor and JPEG Codec

TC5747 Data Sheet
Single Chip CMOS Imager
2.10 Resolutions and Frame Rates
The following table summarizes the possible resolutions and frame rates that the TC5747 can produce. The
calculation for modes 1, 2 and 3 assume an input and color-processing clock of 32MHz. For mode 4, a
16MHz clock is assumed. The analog clock rate varies according to mode.
MODE 1
(Full resolution)
32MHz rclk
8MHz pixel
clock
8 rclk cycles/pix
Full power
MODE 2
(MODE1with
window)
32MHz rclk
8MHz pixel clock
8 rclk cycles/pix
Full power
VGA
QVGA– no
down sample
QVGA–down
sample
20 fps
20 fps
40 fps (reduced
field of view)
MODE 3
(down-sample, only 1
ADC is used)
32MHz rclk
8MHz pixel clock
MODE 4
(down-sample with
speed-up)
16MHz rclk
4MHz pixel clock
8 rclk cycles/pix
Slightly reduced power
4 rclk cycles/pix
Significantly reduced
power
40 fps (full field of view) 40 fps (reduced field of
view)
Table 3: Analog Clock Rate Modes
2.11 Analog Processing
Analog processing includes a separate gain control for each color filtered pixel, dark pixel correction for
each color separately, dark and black-offset correction, faulty pixel replacement and 10-bit ADC.
2.12 On-chip Micro Controller
The TC5747 is fully controlled by the embedded microcontroller. Once the firmware, which is supplied by
TransChip, is loaded, the embedded microcontroller sets the appropriate registers, and runs the automatic
image processing algorithms. An external host does not need to access TC5747 registers and set values, nor
does it need to run any algorithm. An easy to use API (Application Programming Interface) is provided to
set or adjust various camera controls. The API is performed via a small set of host commands, which are
sent over the serial interface (I²C or UART), and are interpreted by the embedded microcontroller, to
perform specific camera control, or any other defined internal task.
The set of host commands include:
Color adjustments (Brightness, contrast, saturation, etc)
Image Format (size, mirror x and y, etc)
Automatic algorithm enable and parameters (Auto Exposure, AWB, Auto Flicker detection and
cancellation)
The concept of host commands makes it very useful, as it is going to be forward compatible with any of
TransChip sensor, since it is not hardware dependent (namely no need to use specific hardware registers.
TransChip ©
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