Philips 32PF9968/10 Service Manual page 84

EN 84 9. L04A AD
Pin Name Description
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 AP/ LATAM
0 LED lighted Standby
1 LED "off" 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
disable it during Standby. It is of logic "low" (0 V) under
normal operation and "high" (3.3 V) during Standby.
• IR. This input pin is connected to an RC5 remote control
receiver.
• SEL-IF-LL'/ M-TRAP. For AP: All L04 AP sets are Multi
System QSS set. This is an output pin to switch the Video
SAW filter between M system and other systems.
– 0: NTSC M (default)
– 1: PAL B/G, DK, I, L
• Write Protect. The global protection line is used to enable
and disable write protection to the NVM. When write to the
NVM is required, pin 7 of the NVM must be pulled to logic
'0' first (via Write_Protect of the micro-controller pin) before
a write is performed. Otherwise pin 7 of NVM must always
be at logic "1"
– 0: Disabled
– 1: Enabled (default)
• Mute. This pin is use to MUTE the audio amplifier. It is
configured as push pull.
• Rotation. This pin is configured as PWM for the Rotation
feature. The output of the PWM is proportional to the
feature control.
• Light Sensor. This pin is configured as ADC input for the
Light Sensor.
• Sel_SC2_Interface. This pin is use to switch between the
SC2_CVBS_OUT and the INTF_CVBS_OUT for the
SCART_2_CVBS_OUT/ MONITOR_OUT signal.
– 0: Hercules CVBS Output (default)
– 1: Interface CVBS Output
• PWRDOWN. The AUX SMPS generates this signal. Logic
"high" (3.3 V) under normal operation of the TV and goes
"low" (0 V) when the Mains input voltage supply goes below
70 V_ac.
• Keyboard. Following are the Keyboard functions and the
step values (8 bit) for it.
Circuit Descriptions, Abbreviation List, and IC Data Sheets
Configuration
-
ADC3
P2.4
P2.5
INT2
-
-
Table 9-6 Local keyboard values
Function Voltage (V_dc) Step values (8 bit)
NAFTA Standby 0
Ch + 0.43
Exit Factory (Ch- and Vol-) 0.69
Ch - 0.93
Menu (Vol - and Vol +) 1.19
Vol - 1.49
DVD Eject 1.8
Vol + 2.12
• SDM. This pin is configured as Open Drain during the cold
start only. If this pin is shorted to ground during cold start,
it will enter the SDM mode (for Service use).
• ISP. This pin is configured as Open Drain during the cold
start only. If this pin is shorted to ground during cold start,
it will enter the ISP mode (for Service use).
• PANEL. This pin is configured as Open Drain during the
cold start only. If this pin is shorted to ground during that,
then it will enter to the PANEL mode.
• ResetEnabled. This is an output pin to switch the control
transistor (pos. TS7202) "high" or "low" for the reset of 1.8
V in case there is a corruption in the Hercules.
9.5 Tuner and IF
The tuner used in this chassis comes from two sources, from
Philips and from Alps. Both tuner sources have the same pin
configuration so they are 1 to 1 compatible except for the
software, which will be selected by means of Option Settings.
Some features:
• Multi-Standard alignment free PLL-IF, including SECAM L/
L'.
• Integrated IF-AGC time constant.
• Integrated sound band-passes and traps (4.5 / 5.5 / 6.0 /
6.5 MHz).
• Group delay compensation (for NTSC and for PAL).
• QSS versions with digital Second-Sound-IF SSIF (AM
demodulator for free).
• FM mono operation possible: Inter-Carrier or QSS.
9.5.1 Pin Assignments and Functionality
Pin assignment of the Tuner:
Table 9-7 Pinning Tuner
Pin Pin Description
1 RF-AGC
2 FM Radio Input or N.C
3 NC (Address Pin)
4 SCL
5 SDA
6/7 Supply Voltage
8 N.C
9 Tuning Supply Voltage
10 FM Radio IF Output/Ground -
11 TV IF Output
The table below shows the switching behavior of SAW filter.
Table 9-8 Switching behavior SAW filter
Condition
High
System M
Note: The logic level is measured at the base of transistor
7001.
0 - 6
7 - 33
34 - 53
54 - 73
74 - 96
97 - 121
122 - 147
148 - 169
DC Voltages
4V for Maximum Gain < 4V for Strong Signal
Condition
-
-
0 to 3.3 V_dc
0 to 3.3 V_dc
5 V_dc +/- 0.25 V
-
30 to 35 V_dc
-
Low
BG/DK/I/L