Philips FM24 Service Manual page 103

www.freeservicemanuals.info
9.4.4 Control (Diagrams SC7, 8 and 9)
Introduction
As a main controller, the so-called ARTISTIC is used, better
known as OTC (On screen display, Teletext and Control). It is
a 8051 (XA) based controller from Philips Semiconductors, the
SAA5801H.
Although the OTC is the main controller, it acts as a 'slave'
when communicating with the PixelWorks IC via the I
When the monitor is connected to an F21RE Receiver box, the
UART commands from the Receiver box will control the
monitor.
OTC Processor
TXD
RXD
RS232
VGA2-TXD
VGA2
VGA2-RXD
(FLEX)
VGA1-TXD
VGA1-RXD
VGA1
VGA1-H
VGA1-V
PSU
5V
8V
RC
RECEIVER
RC-OUT
This part describes the Main Control part of the SCAVIO panel
and the interfaces with the software. The control function
consists of the following tasks:
• Control of external IOs, like fan speed, temperature,
service and RC5,
• UART communication with Receiver box,
• RS232 control / communication,
• Supports the uploading of new SW into the Flash-ROMs,
• Start-up of monitor and initialisation via I
• Error detection and storing.
Circuit Descriptions and List of Abbreviations
7340 7540
SELECT-1
SELECT-2
EXPANDER
SELECT-3
PCF8574
SELECT-4
7812
MSP-
UART
RESET
RS232
AUDIO
SWITCH (MSP)
7383
RS-232-ACT
SAA5801
UART-ACT
TXD-OTC
RXD-OTC
SYNC-ACT
SYNC
DETECT
I2C-1
3V3-STBY
RESET
RESET
STANDBY
POWER-OK
5V-TEST
5V TEST
8V-TEST
8V TEST
RC5-IN
SERVICE
RC-CNTL
INPUT
SERVICE_IN
2
C,
Digitized in Heiloo, Holland
In stand-alone mode, the monitor can be controlled via the
Remote Control or via the RS232C port.
DDC1/2B (Display Data Channel, an I
implemented with separate NVMs for the two VGA inputs and
the DVI-D input as well.
It is also possible to use the RS232C port for software upload
2
C-bus 2.
to the PW Scaler and the OTC. The target for downloading is
controlled via a switch in the RS232C path; the switch itself is
controlled by the OTC.
IO
PDP
POWER
DOWN
I2C-1
OTC
& &
7510
WP
FLASH ROM
7506
Figure 9-16 Control Part
Start-up and Shut-down
The POR signal is not generated on the PSU, but on the
SCAVIO board. This is done with a fully integrated ADM810T
POR chip (item 7517), which senses the 3.3 V coming from the
PSU. The sense level is 3.08 V. During power-up as well as
power-down, this chip will make the RESET signal high. During
power-up, this signal will be held 'high' until 240 ms after V
has become stable.
During power-down, the system will be reset as soon as the
V drops below 3.08 V.
CC
FM24
2
C based protocol) is
7530
TEMP-1
ADC
TEMP-2
CLOCK
GENERATOR
7656
NVM-WE
EPLD
I2C-NVM
RED-LED
GREEN-LED
PW-RESET
PW-START
I2C-2
RAS
CASL
CASH
AC(0:9)
DC(0:15)
CL16532099_004.eps
31/8/2014
9. EN 103
7430
NVM
OTC
LEDS
7605
PW
7500
DRAM
170801
CC