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Circuit Descriptions, List of Abbreviations, and IC Data Sheets
During the first half of the intensity increase, the scan velocity
is increased (thus decreasing the current density by spreading
it on a wider area). During the second half of the intensity
increase, the scan velocity is decreased (increasing the current
density by concentrating it on a smaller area). The increasing
current density transition is sharpened. A decreasing current
density transition is processed in a similar way and is also
sharpened.
In this chassis the SCAVEM signal is different from its
predecessor because the Hercules generates the differential
SCAVEM signal inside the IC.
The supply of the SCAVEM is taken from V_bat through a 1k5
/ 5 W resistor. Compared with the M8/L01.1, this has the
advantage of getting better performance for the pattern with
tremendous SCAVEM current (like V_sweep). In this former
chassis, because the supply was taken from the 200 V through
a 8k2 / 5 W resistor, the supply dropped significantly during a
large SCAVEM current. In this chassis, the drop due to the
pattern will be less because of the lower supply voltage
impedance.
In the Main Board, 1st stage amplification is taken care by 7208
with the pull up resistors (3361, 3387) located in the CRT panel.
TS7361 and TS7362 is the current buffer delivering the current
to the output stage. The diode D6361 is to lightly bias these
transistors, to get rid of the zero crossover of the stage.
After that, the signal is ac-coupled to TS7363 and TS7364
where the emitter resistors (R3364 and R3370) will determine
the final SCAVEM current. TS7363 and TS7364 are biased by
R3363, R3366, R3367 and R3368.
C2387, R3388, R3389, R3365, R3369, C2384, and C2385 are
used for suppressing unwanted oscillations.
The function of TS7376 is to limit the SCAVEM current from
going too high. It basically senses the voltage after R3373 and
clamps the SCAVEM signal through D6367 and C2376.
9.4
Control
The Micro Controller is integrated with the Video Processor,
and is called the Hercules. For dynamic data storage, such as
SMART PICTURE and SMART SOUND settings, an external
NVM IC is being used.
Another feature includes an optional Teletext/Closed Caption
decoder with the possibility of different page storage depending
on the Hercules type number.
The Micro Controller ranges in ROM from 128 kB with no TXT-
decoder to 128 kB with a 10 page Teletext or with Closed
Caption.
9.4.1
Block Diagram
The block diagram of the Micro Controller application is shown
below.
Power Supply
STBY_CON
POWER GOOD
KEYBOARD/
PROTECTION
KEYBOARD/PROTECTION
CIRCUIT
VIDEO
INPUT
VOLUME/MUTE/TREBBLE /BASS/PANORAMA
ONO AUDIO PROC.
OUTPUT
AUDIO A P
LIGHT SENSOR
LED
ONITOR
IR
OUTPUT
LIGHT SENSOR
LED
IR
Figure 9-4 Micro Controller block diagram
WRITE
PROTECT
NVM
ST24C16W6
ERCULES
Micro
IIC
Controller
Data
Lines
LTI\CTI
orizontal
Pulse
TUNER
DEFLECTION
E_14480_070.eps
120504
L04HU AA
9.4.2
Basic Specification
The Micro Controller operates at the following supply voltages:
•
+3.3 V_dc at pins 33, 125, and 19.
•
+1.8 V_dc at pins 126, 36, and 33.
•
I2C pull up supply: +3.3V_dc.
9.4.3
Pin Configuration and Functionality
The ports of the Micro Controller can be configured as follows:
•
A normal input port.
•
An input ADC port.
•
An output Open Drain port.
•
An output Push-Pull port.
•
An output PWM port.
•
Input/Output Port
The following table shows the ports used for the L04 control:
Table 9-4 Micro Controller ports overview
Pin
Name
Description
32
INT0/ P0.5
IR
31
P1.0/ INT1
PWRDOWN
30
P1.1/ T0
LED
27
P0.4/ I2SWS
(for future use)
26
P0.3/ I2SCLK
(for future use)
25
P0.2/ I2SDO2
SEL_SC2_INTERF
ACE/ SDM
24
P0.1/ I2SDO1
(for future use)
23
P0.0/ I2SDI/O
Panorama
22
P1.3/ T1
Write Protect
21
P1.6/ SCL
SCL
20
P1.7/ SDA
SDA
18
P2.0/ TPWM
VOL_MUTE
17
P2.1/ PWM0
ROTATION
16
P2.2/ PWM1
SEL_LL'/M
15
P2.3/ PWM2
STANDBY_CON
14
P3.0/ ADC0
Light Sensor
13
P3.1/ ADC1
(for future use)
10
P3.2/ ADC2
(for future use)
9
P3.3/ ADC3
KEYBOARD
7
P2.4/ PWM3
A (for future use)
6
P2.5/ PWM4
B (for future use)
3
P1.2/ INT2
C (for future use)
2
P1.4/ RX
E (for future use)
1
P1.5/ TX
D (for future use)
The description of each functional pin is explained below:
•
LED. This signal is used as an indication for the Standby,
Remote and Error Indicator. Region diversity:
–
During protection mode, the LED blinks and the set is
in standby mode.
–
During error conditions it blinks at a predefined rate.
–
After receiving a valid RC-5 or local keyboard
command it flashes once.
–
For sets with error message indication, the LED blinks
when message is active and the set is in standby
mode.
Table 9-5 LED signal diversity
LED Europe
0
LED brighter Standby
1
LED dimmer Normal
•
SCL. This is the clock wire of the two-wire single master bi-
directional I2C bus.
•
SDA. This is the data wire of the two-wire single master bi-
directional I2C bus.
•
STDBY_CON. The Hercules generates this signal. This
can enable the MAIN SMPS in normal operation and
9.
EN 71
Configuration
INT0
INT1
P1.1
-
-
P0.2
P0.1
P0.0
P1.3
SCL
SDA
P2.0
PWM0
P2.2
P2.3
ADC0
-
-
ADC3
P2.4
P2.5
INT2
-
-
AP/ LATAM
NAFTA
LED lighted Standby LED lighted Normal
LED "off"
Normal
LED "off"
Standby
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