Overview

LC822152 is a chip which compresses and expands the image inputted from the CCD/CMOS by JPEG format, interfacing the LCD controller equipped with built-in CCD/CMOS sensor module and display memory for DSCPHONEs. Since the I2C master device circuit is embedded in the chip and the signal required for the CCD/CMOS module is supplied from this chip, regarding the CPU, it is not necessary to concern the interface with the CCD/CMOS module. In addition, the zooming function using the H/V scaling circuit allows an effective LCD display. The functions comprises the following blocks :

• Image-processing unit where the 8-bit video image data in YUV422 (211) format from CCD/CMOS is scaling processed, performed scaling down and cropping (to cut the four sides) to any size, converted to the RGB565 format and then sent to the LCD controller.

• JPEG processing unit where the YUV422 (211) image data (VGA size) input from CCD/CMOS or the image data which has been processed by scaling or cropping is compressed to the JPEG format, and the sign data is output. Or JPEG processing unit where the sign data input from the host is processed with JPEG decryption and sent to the image processing unit.

• Thumbnail image processing unit where the image data output to the LCD controller is thinned out and reduced to a maximum 40×40 sized image.

• Host control unit where CPU interface, register control, LCD bus switching, JPEG code data transfer, and thumbnail image data transfer are performed.

• I2C interface unit for the CCD/CMOS module access.

• LCD controller interface processing unit allows the RGB666 output (260,000 colors) supporting the 18-bit parallel and various split transfer.