Circuit Descriptions
7.
7.
Circuit Descriptions
Index of this chapter:
7.1 Introduction
7.2 Block Diagram
7.3 MT8222TMMU
Notes:
•
Only
new
circuits (circuits that are not published recently)
are described.
•
Figures can deviate slightly from the actual situation, due
to different set executions.
•
For a good understanding of the following circuit
descriptions, please use the wiring, block (chapter 9) and
circuit diagrams (chapter 10). Where necessary, you will
find a separate drawing for clarification.
7.1
Introduction
This platform LCD-TV uses two main ICs: MT8222TMMU (One
Chip LCD-TV Controller) and WT6703F (Stand-by MCU). The
MediaTek MT8222TMMU is an ultra highly integrated single
chip for flat panel TV supporting multimedia video/audio input
and output format up to full HDTV. It includes advanced 3D
comb filter TV decoder to retrieve the best image from popular
composite signals and embedded HDTV/VGA decoders for the
high bandwidth input signals perfectly reproducing.
The new 4th generation advanced motion adaptive and motion
estimation de-interlace converts accordingly the interlace video
into progressive one with overlay of a 2D graphic processor.
Independent two flexible scalars provide wide adoption to
various LCD panels for two of different video sources at the
same time. On-chip audio processor decodes analog signals
from tuner with lip sync control, delivering high quality post-
processed sound effect to customers.
The WT6703F is mainly for TV stand-by remaining function
during off/stand-by mode. When TV set enters to off/stand-by
mode, MT8222 CLD will be totally shutdown and remain only
WT6703F to meet the lowest power consumption.
The WT6703F is a micro controller for system power manager
with Turbo 8051 compatible (3T) CPU, flash memory, SRDAM,
two pulse width modulators, DPMS detector, double timers and
UART, three slave I
2
C interface, a 4 channel 8-bit A/D
converter, real time clock, watch-dog timer, embedded ISP,
power down mode and embedded ICE mode.
7.2
Block Diagram
7.2.1
Features
Block diagram Functional diagram
The tuner supports NTSC\PAL\SECAM RF signals.
For TV signal, MT8222TMMU with single high-quality 4th
generation TV decoder Automatic TV standard detection
supporting NTSC, NTSC-4.43, PAL (B, G, D, H, M, N, I, Nc),
PAL (Nc), PAL, SECAM New 4th generation NTSC/PAL/PAL-
M/PAL-N Motion Adaptive 3D comb filter Embedded VBI
decoder for Closed-Caption/XDS/ Teletext/ WSS/VPS
Supporting macrovision detection.
The platform supports different I/O sources:
•
CVI supports YPbPr component input, it can support SD/
HD format
•
SIDE-AV supports CVBS, S-Video signal shares with same
audio.
•
HDMI supports up to HDMI 1.3a with CEC & HDCP
function, audio included and also supports PC DVI signal
with HDCP function, the audio shares with PC audio
connector via PC mini-jack
•
PC supports analog PC input via 15 pin D-sub input
•
Analog audio out supports via RCA jack
Each video/audio signal of all sources will directly deliver to
MT8222TMMU for video/audio further digital processing.
Pre-Audio out signal is sent through the DAC out and is
amplified to main speaker by audio amplifier MAX97
TPA3123D2 and is simultaneously amplified to head phone by
audio amplifier MAX9728AETC.
