Basic Structure; Internal Connections; Power Supply; Crystal Resonator - Toshiba 21E88 Service Manual

5). Basic Structure

5.1). Internal Connections

TMPA8801/8807 has two pieces of IC chip in one package, using Multi-Chip-Package (MCP)
technology. One is
a micro controller (MCU) and the other one is a signal processor (SP) for a color TV. There are some
internal connections between these two ICs for handling below signals.
Signal Name
1 SCL
2 SDA
3 OSD R
4 OSD G
5 OSD B
6 OSD Y/BL
7 OSD I, CS OUT
8 C-Video
9 C-Sync
10 HD
11 VD
12 CLK
13 AV
DD
14 ADC
Functions of SP from MCU are controllable through the IIC bus of the internal connections.

5.2). Power Supply

TMPA8801/8807 has some power supplys and GND pins. Power supplies related MCU must be
applied at the
first. Power supplies for H.VCC and TV D.VCC are the second with at least 100 ms delay after MCU
power
ON. The other power supplies are the last, which are recommended to be supplied from a regulator
circuit
using FBP.

5.3). Crystal Resonator

TMPA8801/8807 requires only one crystal resonator, in stead that a conventional two-chip solution
requires
two resonators at least, one for MCU and the other one for SP. An oscillation clock with the crystal
resonator of TMPA8801 /8807is supplied for MCU operation, PIF VCO automatic alignment, alignment
free AFT,
chroma demodulation and horizontal oscillation. The oscillation frequency is very important so that
those
SERVICE MANUAL
Table 7 Signal Name Direction Description
Direction
M to S
Bi-direction
M to S
M to S
M to S
M to S
M to S
S to M
S to M
S to M
S to M
M to S
M to S
S to M
36
Description
Internal IIC bus SCL
Internal IIC bus SDA
OSD signal connection
OSD signal connection
OSD signal connection
OSD display control
OSD half-tone control/Test pattern signal
Composite video signal from internal video switch, for CCD
Composite sync. signal from sync. Separator, for CCD
Horizontal timing pulse regenerated from FBP, for OSD
Vertical timing pulse from sync. Separator, for OSD
8 MHz clock
Reference voltage for C-Video interface
A/D converter monitoring RF-AGC, R-Y and B-Y