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4. Circuit Description
4.1 Main Board
U401 NT68667UFG/C
The NT68667 is a highly integrated flat panel display controller that interfaces analog, digital, and video inputs. It
combines a triple ADC, a DVI compliant TMDS receiver, a digital YUV receiver, a high quality zoom and shrink
engine , a multi-color on screen display (OSD) controller , an advanced color engine , and many other functions in a
single chip. It provides the user with a simple, flexible and cost-effective solution for various flat panel display
products.
The NT68667 operates at frequencies up to 188MHz/190Mhz, suitable for LCD monitor up to
1680x1050/1920x1080 resolution. The NT68667 also has a built-in noise reduction function to provide more stable
video quality, spread spectrum to provide low EMI solution, sRGB for video color space convert and post pattern for
manufacture test.
The display provided single/double pixel clock LVDS interface.
In addition, NT68667 includes an integrated 8-Bit Microcontroller (MCU). It contains an 8-bit 8031 micro-controller,
1,280-bytes internal data memory, four 7-bit resolution A/D Converter, 10-channel 8-bit resolution PWM DAC,
two16-bit timer/counters, and a UART. Except those, it has two-channel hardware DDC solution, and VESA 2Bi/2B+
master/slave I2C bus interface.
Block Diagram