Philips 8000 Series Service Manual page 53

The communication between PNX85500, Complex
Programmable Logic Device (CPLD) and the Ambilight module
uses the SPI protocol; refer to figure
protocol outside LED board. Between the CPLD and the LED
driver, as "extra" line is mentioned:
• Non-SPI signals that are required for the LED driver
• Temperature sensor line.
S P I
P N X
Figure 7-27 Communication protocol outside LED board
Refer to figure for an overview of the communication inside the
LED board.
S P I S P I
B uffer
Tem p
sensor
Te m p
Figure 7-28 Communication protocol inside LED board
The buffer is built around item no. 7B20 (diagram AL1A) and
regenerates the clock signals. Refer to figure
buffer.
74LVC2G17
3B01-2
2 7 1
PWM-CLOCK
100R
3B01-1
1 8 3
SPI-CLOCK
100R
Figure 7-29 Ambilight buffer
The temperature sensor is built around item no. 7B30 (diagram
AL1A) and indicates overtemperature of the board. Refer to
figure 7-30 Temperature sensor.
7-27 Communication
S P I + e x tra
C P LD
18770_211_100126.eps
100126
E x tra
S P I
LE D
D river
E E P R O M
S P I
S P I
18770_213_100126.eps
100219
7-29 Ambilight
+3V3
7B20-1
3B30-1
PWM-CLOCK-BUF
6 1 8
220R
7B20-2
74LVC2G17
+3V3
3B30-4
4 4 5 SPI-CLOCK-BUF
220R
18770_214_100126.eps
100126
Circuit Descriptions
+3V3
FB40
Figure 7-30 Temperature sensor
The EEPROM (item no. 7B07; diagram AL1A) contains
alignment information about the mounted LEDs and is
programmed during the alignment process in production. Refer
to figure 7-31 EEPROM.
SPI-DATA-IN-BUF
SPI-CLOCK-BUF
+3V3
7B06
74LVC1G32GW
1
SPI-CS
2
DATA-SWITCH
SPI-DATA-RETURN
The LED driver is built around item no. 7B26 (diagram AL1A)
and controls the LEDs. Refer to figure
back to
div. table
Q551.1E LA 7.
3B34
+3V3
100K
RES
+3V3
7B30
1
4
3
LMV331IDCK
FB41
18770_215_100126.eps
+3V3
7B07
M95010-WDW6
VCC
Φ
5 2
D Q
(64K)
6
C
4 1
S
7
HOLD
+3V3 3B02-1
1 8 3
W
10K
GND
18770_216_100126.eps
Figure 7-31 EEPROM
7-32 LED
EN 53
TEMP-SENSOR
100126
3B02-2
+3V3
7 2
10K
100126
driver.
2010-Jun-25