Canon CIS 36-Bit Color Single Line Scanner PDF User Manual
The XRD9827REF is a demo system which includes a PCB design with a CANON CVA-60216K 600DPI Color Contact Image Sensor (CIS). It demonstrates how to interface a CIS with EXAR’s XRD9827, a 12-bit Linear CIS/CCD Sensor Signal Processor to output a single line scan and display the amplitude of each of the three colors. The XRD9827REF is designed to provide a signal path for the CIS output signals to be processed, digitized by the XRD9827 and transmitted to a personal computer. There are no software algorithms or hardware implementations, for example, gamma correction, to adjust for color response. The XRD9827REF board is loaded with the XRD9827, a Vantis MACH435 CPLD, two FIFO SRAMs and peripheral circuits for the CIS. The MACH435, which is a CMOS Programmable Logic Device (CPLD) provides timing signals to the XRD9827, the SRAMs and the CIS. It also programs the XRD9827 to operate in the correct mode and adjust for gain and offset values. The XRD9827 processes the analog output from the CIS sensor, level-shifts and converts the signal into 12-bit digital codes.
The SRAMs gate the digitized data from the XRD9827 and stores the data temporarily. Controlled by the software, the SRAMs send the data through a parallel port connection to the PC and histograms of raw data are displayed in the monitor using the SenseIt software. A block diagram of the XRD9827REF is shown below in Figure 1. The XRD9827 is a complete linear CIS or CCD sensor signal processor on a single monolithic chip. The XRD9827 includes a high speed 12-Bit ADC, a 6-Bit Programmable Gain Amplifier with gain adjustment of 1 to 10 and an 8-Bit programmable input referred offset calibration range of 800 mV. The XRD9827 also provides the necessary biasing voltage for the CANON CIS, eliminating the use of external components (two diodes and two resistors). See the XRD9827EVAL User Manual / PCB board for evaluating the XRD9827 CIS / CCD signal processor chip. A simplified functional block diagram of XRD9827 is shown below for your reference.
OPERATIONAL PROCEDURE
The routine listed below will first calibrate the photo response of the CIS using the XRD9827 by optimize its offset and gain. After calibration, the XRD9827REF can be used to scan any color target to show CIS non-color corrected response. (Color correction is typically done in the digital ASIC.)
PRELIMINARY
How to Run the XRD9827REF Demonstration
1. Make sure the computer is powered off and the AC power adapter is disconnected from a wall outlet
2. Connect the parallel port cable to the printer port of the computer
3. Connect the AC power adapter into a wall outlet
4. Turn on the computer and activate Windows 95 Loading EXAR Software
5. Load the diskette labeled SenseIt 1.0 Disk # 1 into the floppy drive
6. Select the Start menu in the program manager and choose RUN
7. Inside the small pop-up window, type: A:setup
8. Follow the instructions to finish software installation Parallel Port Configurations
9. Confirm the parallel port address as follows:
I. Select the Start Menu, choose Settings, then choose Control Panel
II. From the Control Panel window which pops up, double-click on System
III. In the System Properties window, select Device Manager
IV. From the Device Manager window, double-click on Ports (COM & LPT)
V. Double-click on Printer Port (LPT1). If you can not find it, please goto Step 10
VI. From the pop-up window, select Resources
VII. Verify the Input/Output Range is set to 0378 – 037F
VIII. If the range is not correct, clear the Use Automatic Settings check box by clicking it
IX. Choose correct address which is 0378 by default and click OK
X. Re-start the computer as advised
10. If you do not have a Printer Port configured on your computer, please follow the steps listed below:
I. From the Control Panel window which pops up, double-click on Add New Hardware
II. From the pop-up window, click the Next > button
III. Select ‘No’ when prompted for ‘Do you want Windows to search for your new hardware?’, then click the Next > button
IV. Choose Ports (COM & LPT), then click the Next > button
V. Choose Printer Port, then click the Next > button
VI. Make a note of the Input/Output Range of Printer Port of your computer and click OK. You will use these values later when configure the SenseIt software
VII. Re-start the computer as advised Offset Adjustment With a Black Target
11. Set the dip switches located on the side panel of the scanner to [110 01000000] as shown in Figure 3 and push the Serial Port button which is located on the front panel of the demo system. This will reset the XRD9827.
12. Select the Start Menu, choose Programs, then choose SenseIt icon
13. A window will pop up as shown below. The upper window shows the plot of captured data and the lower window shows the histogram of data. Figure 4 shows the pop-up window when SenseIt is first started.
14. Select SETUP from the pull-down menu and choose I/O ADDRESS. In the window that pops up, type in the Input/Output Range of Printer Port of your computer. The default setting is 378H.
15. Pick the black target out from the kit and put it on a flat area. Place the XRD9827REF on top of the black target with the CIS sensor facing downwards. From the CAPTURE menu select SNAP SHOT (or simply press CTRL and B buttons simultaneously) for a single line scan of the black target with the dip switches set to [000 00000000]. A typical result of a black target scan is shown below…
Download Canon CIS 36-Bit color Single Line Scanner PDF User Manual
Related Info:
Comments
Leave a Reply