Table of Contents
Advertisement
4. Circuit Description
WORKING THEOREM
A. DC-DC CONVERTER
This brick converts the 12V input voltage to 5V for panel use and 3.3V for controller use.
It consists of a PWM IC (AP1501), flywheel Diode (D1), buck choke (L2), and capacitor (C70,71).
AP1501 is a PWM generator working at 150Khz.
Self protection features include a two stage frequency reducing current limit for the output
switch and an over temperature shutdown for complete protection under fault condition.
B. A/D converter
The MRT V3 is a highly integrated TFT LCD controller chip with the latest MRT advanced imageprocessing
technology and an integrated ADC/PLL. The MV3 has advanced programmable non-linear parametric
cubic based scaling engine with proprietary sharpness adjustment and text enhancement. MV3 supports both
analog and digital interfaced inputs with an internal ADC/PLL.
The MV3 has robust handling of a wide variety of TFT LCD panels and strong support of standard
or non-standard input timings.
. Integrated high speed triple 8-bit ADC/PLL support up to 140MHz for XGA-75Hz
. Advanced image processing with proprietary non linear parametric cubic based scaling engineSupport dual
interface with an integrated ADC/PLL
. Robust auto configuration for input mode detection and
clock frequency and phase recovery for standard or nonstandard input timing
. Support video processing with on-chip 2D de-interlacing
and color space conversion
. Support programmable Gamma Correction
. GPIO pins for flexible system design
D. MCU:
The MTV312M64 micro-controller is an 8051 CPU core embedded device specially tailored to LCD monitor
applications. It include an 8051 CPU core, 1024-byte SRAM, 14 built-in PWM DACs, VESA DDC interface,
4 channel 6bit A/D converter, a 64 K-byte internal program Flash-ROM .
ViewSonic Corporation
Confidential - Do Not Copy
7
VG510b/s
Advertisement
Table of Contents
