SAA8112HL

General description

The SAA8112HL is a powerful and versatile 10-bit digital processor for video cameras. It processes the digitized sensor data and converts it to a high quality, multi-format and YUV digital signal. In addition, the SAA8112HL performs programmable statistical measurements on the video stream allowing, for instance, a precise measurement of the exposure or the white balance levels.

An 80C51 microcontroller derivative with five I/O ports, I²C-bus, 512 bytes of RAM and 32 kbytes of program memory is also embedded in the SAA8112HL. The microcontroller is used in combination with the Digital Signal Processing (DSP) measurement capabilities to provide advanced AE, AWB and AOB. The microcontroller may also be used to control other devices in the camera, for example a USB or a 1394 interface.

In the following description of the SAA8112HL, four main functional blocks are given

• The DSP block
• The DSP ME block
• The microcontroller block
• The timing, interface and miscellaneous functions block.

Features

• High precision digital processing with 8- to 10-bit input
• Embedded microcontroller (80C51 core based) for control loops Auto Optical Black (AOB), Auto White Balance (AWB) and Auto Exposure
  (AE)
• Supports a large number of sensors
• RGB Bayer or mosaic (yellow, magenta, green and cyan) colour processing
• Black and white processing without loss of resolution
• Compatible with interlaced or progressive modes
• Processes up to 800 active pixels per line
• Optical black processing
• Programmable colour matrix
• Programmable R, G and B offsets
• Programmable Knee and Gamma correction
• Programmable edge enhancement
• False colour detection and correction
• Y and UV adjustable coring filters
• Flexible Measurement Engine (ME) with up to 16 measurements per frame in 16 programmable windows
• Programmable measurement conditions on Y, U and V
• 8-bit YUV output with selectable formats:

• YUV 4 :2 :2 CCIR656 with signal embedded synchronization codes (SAV/EAV)
• Selectable YUV output format 4:0:0, 4:1:1, 4:2:2 and 4:4:4(according to IEEE-1394 based digital camera specification)
• Basic output window cutter and scaler.

• Programmable output clock for switched mode power supply
• 3-wire/13-bit interface for control of the TDA878X family (CDS + AGS + 10-bit ADC).

Applications

• PC camera
• Videophone
• Security camera
• Camcorder.

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