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DA100 (50Hz) Chassis – Article for Television Magazine
Control and Communication
As with all current Sharp television chassis, the microprocessor (CPU) is responsible for the control of
the set, communicating with all other areas of the chassis via various data buses. Similar to other
chassis the CPU does not operate during standby. As there needs to be some form of control on the
primary side of the power supply, a slave processor is used. This slave processor has a volatile
memory, therefore each time power is applied to the television the switch mode powers supply has to
start, enabling the slave processor program to be downloaded from the OTP before switching to
standby.
the set, communicating with all other areas of the chassis via various data buses. Similar to other
chassis the CPU does not operate during standby. As there needs to be some form of control on the
primary side of the power supply, a slave processor is used. This slave processor has a volatile
memory, therefore each time power is applied to the television the switch mode powers supply has to
start, enabling the slave processor program to be downloaded from the OTP before switching to
standby.
Figure 50: Communication Block Diagram
Communication Lines
There are several types of communication lines that provide information to the CPU, and are used to
control the various devices connected to it. These are as follows.
control the various devices connected to it. These are as follows.
Parallel Bus
This provides communication between the CPU and the ROM (OTP, MTP or EPROM). This device
contains the software (operating system)
contains the software (operating system)
I2C Bus
There are two I2C buses, I2C(2) is used to communicate with the NVM’s (EPROM’s), these devices
contain data relating to all adjustments, whether it is an end user adjustment, service adjustment or
an automatic setting performed by the CPU. I2C(1) provides serial data communications between the
CPU and Tuner, Video Processor, Multiple Sound Processor and the Dolby Processor (if fitted).
contain data relating to all adjustments, whether it is an end user adjustment, service adjustment or
an automatic setting performed by the CPU. I2C(1) provides serial data communications between the
CPU and Tuner, Video Processor, Multiple Sound Processor and the Dolby Processor (if fitted).
M3 Bus
This bus line provides data communication between CPU and the Megatext processor.
Page 50 of 80
Sharp Electronics (UK) Limited - March 2003
Revision 2
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