Table of Contents
Advertisement
Pin 114 controls Inverter enable or disable
Pin 113 enable vcc for panel
Pin 125 send a HI signal when audio is invalid
send a LOW signal when audio is valid
pin 5 receive HI signal from IC401 pin 3 to reset
pin 1, 4, 39, 43, 46, 47, 125, 206 make key function operate when press key button
pin 51, 52 communicate with IC404 (EEPROM) by I
pin 48 detect audio in
pin 51, 52 do ISP(in-system program)
Pin 40 controls the brightness of panel
Pin 41, 42 controls LED (orange and green) on /off
Pin 123 control audio board 12V on/off
Pin 126 control IC500, IC501 (LVDS Transmitter) on/off.
1.3. Image Processor
IC400 (gm5120) is an all-in-one image processor for displays with a dual (analog and digital) interface
supporting resolutions up to SXGA. It provides integrated ADC/PLL and a DVI compliant TMDS
receiver and MCU, a high quality zoom and shrink scaling engine, an on-screen display (OSD)
controller, a microprocessor and many other functions in a single device. This high level of integration
enables simple, flexible, cost-effective solutions featuring fewer required components.
The gm5120 chip has three ADC's (analog-to-digital converters), one for each color
(red, green, and blue) and supports digital separate sync (HSYNC/VSYNC), digital composite
sync, and analog composite sync (also known as sync-on-green, or SOG). All sync types are
supported without the need for external sync separation / extraction circuits.
The gm5120 features four clock inputs. All additional clocks are internal clocks derived from one
or more of these four, using Direct Digital Synthesis (DDS).
TCLK is generated using an external crystal (recommended) or an external clock oscillator.
(1) Input Clock (TCLK). The external connection to the oscillator is via the TCLK and
XTAL pads. A 14.3MHz crystal source is recommended, as internal PLL and logic
ViewSonic Corporation
(receive LOW signal from key button.)
2
C
Confidential – Do Not Copy
VX700-3
Advertisement
Table of Contents
