Features

USB PC camera system box diagram

ZC0302 The chip provides a single -chip microcomputer for the PC camera application solution. It and the PC host via the general serial bus (USB) port. All major image processing functions, such as image signal chip built -in processing (ISP), image data compression, and data transmission units. At the same time, ZC0302 also provides high -quality audio samples for recording. The audio function conforms to the USB audio class

1.0 points.

ZC0302 is a cost-effective single-chip device, replacing the currently used chipset with embedded USB device controller and transceiver PC camera design. Require. Advanced image signal processor and JPEG encoder generated image quality.

1.1. General Features

... Low -cost single -chip solutions used for high -resolution USB PC camera applications

… Audio function that conforms to USB audio equipment 1.0

... support The high 15 FPS VGA video with DRAM shows

... USB device controller that conforms to USB protocol 1.1

... You can configure USB parameters through EEPROM

... Support from CMOS image sensor The original data of the 9/8 -bit RGB Bayer mode

... Support programmable color correction and gamma correction

... Support programmable automatic exposure/automatic white balance

... Support automatic gain control

... support ISO/IEC 10918-1 (JPEG) standard image compression

... Support 4 quantitative tables to achieve programmable image quality

... Support support The original data output of high -quality static images

3.3V I/O, 2.5V core does not require external DRAM flexible system -level solutions to support

zc0302 box diagram

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ZC0302 box diagram

FIG. 2 shows the box diagram of ZC0302. ISP blocks from the CMOS image sensor to receive RGB raw data

interface and perform various image processing tasks, such as white balance, color correction, gamma correction, and histogram balanced. Sample samples and grating blocks process input image data zoom and

Convert the input image data to the 8x8 block data format required for DCT modules. JPEG encoding block compression

Converting ISP image data blocks to JPEG formatThe data. The compressed image data is displayed to the PC host through the USB device controller (UDC) block.

Audio interface receives 16 -bit single -channel PCM format audio input, and then via the audio stream pipes in UDC.

CMOS image sensor interface supports the sensors of most CMOS image sensor suppliers, including Agellen, Hemori, IC Media, Tasc, Pixar, photography, omnidirectional and century 9bit/8bit camera input interface

] USB function

The built -in USB transceiver pause and remote wake -up video, audio and control 3 interfaces through EEPROM's programmable OEM USB parameters include: supplier ID, product ID, MaxPower, serial number, manufacturing descriptors , Product descriptor and chip revision.

Image signal processing

Hardware dead pixel detection

The original data input of cmos image sensor input

2 line/3 line serial bus of CMOS image sensor Interface programming white balance, color correction and gamma correction

Support automatic exposure control, automatic white balance, automatic CMOS reset control,

Automatic gain control and automatic/manual histogram balance

Support programmable AE/AWB window

Support edge enhancement and noise elimination

Support 2x2 sampling

] The output data format is 4: 2: 2 YCBCR changed the input image data to the 8X8 data format compressed engine required for DCT

Standard JPEG compressed engine conforms to ISO/IEC 10918-1 (JPEG) 2AC and 2DC The quantitative table of the quality of different images of the Harvman encoding table

The JPEG header of the compression rate is adjusted through the Bit rate control (BRC) engine. , The maximum 30 frames per second can be adjusted, effectively using bandwidth

audio interface

Built -in 16 -bit single -channel audio ADC. Class 1.0 compliance System controller Provide control configuration control registers VGA and CIF USB PC camera controller USB interface error detection and processing to ISP, JPEG and USB blocks ] Tube feet allocation