ICM200E Datasheet, PDF (13/32 Pages) List of Unclassifed Manufacturers – Megapixel (UXGA) Digital Color CMOS Image Sensor

ICM200E
2 Megapixel (UXGA) Digital Color CMOS Image Sensor
Preliminary Data Sheet V1.1
Exposure Time
To accommodate different lighting requirements,
you can change the exposure time by adjusting
registers 0x1C and 0x1D. The exposure time is
measured in terms of the time to read out one
line of data.
The time for processing one line is equal to the
pixel clock period times the frame width. The
frame width is stored in registers 0x0C and
0x0D. The default exposure time for one line
width of 1800 is 75 µs when the pixel clock is at
48 MHz.
Digital Gain Control
The ICM200E digital gain control feature is one
of the methods you can use to control image
quality. Adjusting the digital gain is generally
used for minor changes, either to balance color
or to adjust the overall image luminance. The
default gain range is from 1/256 to 8 of the four
Bayer pattern pixels as indicated by the format of
3.8. The format is defined by register 0x52[3:0].
Gain changes require changes to two types of
registers, the immediate gain values (registers
0x20-0x28), and the magnitude of change
register. The magnitude of change register is
register 0x52[3:0]. The default notation is in the
3.8 format, which can be modified to as high as
6.5 by selecting register 0x52[3:0].
Pixel Timing and Function Control
The ICM200E has a software-controlled pixel
analog data path. This feature allows fine-tuning
of the sensor’s performance and makes the
sensor highly adaptable to a wide range of
applications. The pixel analog data path timing is
controlled by the default settings or by
downloading a pixel configuration table.
Register 0x02[4] makes the selection. Pixel
configuration tables are sequentially downloaded
into registers 0x04, 0x05, and 0x06 while
incrementing the 0x03 address pointer.
Auto Analog Gain Calibration
The analog gain can be calibrated by adjusting
the maximum analog input and the maximum
ADC output so that they have the same dynamic
range. To enable automatic gain calibration,
write 0x1 into register 0x00[1].
Low Light Mode
The ICM200E implements an operating mode
for low light conditions. The Low Light mode
uses a special purpose pixel analog data path
configuration with a fixed 3x analog gain. The
low light mode is initialized by sequentially
downloading a low light pixel configuration
table. Setting register 0x91[3:0] to 0x00 enables
low light mode. Restore normal operation by
loading the default pixel configuration table,
followed by setting register 0x02[4] to 0x1. The
default operating mode is resumed by writing
0x1 into register 0x00[1].
Fast Global Reset/M-Shutter
The ICM200E implements a fast global reset
feature in support of low cost mechanical
shutters. With fast global reset, the ICM200E
image sensor array can be reset in 1.5ms @ 5fps
(PCLK=12 MHz). An example fast global reset
image capture sequence is described in Figure 6.
Figure 6. Fast Global Reset
Subsampling Schemes
The ICM200E image sensor allows viewfinder
and other reduced data output modes. It supports
reduced resolution in both SVGA and QSVGA
formats. In addition, the ICM200E image sensor
provides an averaging mode in each of the
reduced resolution formats to further increase the
signal-to-noise (S/N) ratio. The resolution for
UXGA is 1600x1200, which is the native
resolution of the ICM200E. There is no sub-
sampling relationship at UXGA.
Output Data Format
During normal operation, the output format is
10-bit raw data that ranges from 0 to 1023. In
addition to the data pins, the chip also outputs
VSYNC, HSYNC, and PCLK. The length and
polarity of the VSYNC and HSYNC signals can
Copyright 2004, IC Media Corporation
http://www.ic-media.com/
Page 13
9/22/2004