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DP-4X MICROPROCESSOR DATA COMMUNICATIONS CIRCUIT EXPLANATION
I501 Sub Y Pr/Pb Selector
Any input by the time it reaches this IC is in the Y Pr/Pb or Y Cr/Cb state. Selection for the Sub (PinP) picture
will be selected by this IC. The PinP Y Pr/Pb Selector IC selects the appropriate input between Components 1 or
2, HDMI 1 or 2, ATSC Tuner, Sub Tuner or Composite Inputs and/or DVD Player (If Provided). Communication
from the Microprocessor via pins (31 SDA2 and 28 SCL2) to I501 pins (34 and 33) respectively.
I502 Main Y Pr/Pb Selector
Any input by the time it reaches this IC is in the Y Pr/Pb or Y Cr/Cb state. Selection for the Main (PinP) picture
will be selected by this IC. The Main Y Pr/Pb Selector IC selects the appropriate input between Components 1 or
2, HDMI 1 or 2, ATSC Tuner, Sub Tuner or Composite Inputs and/or DVD Player (If Provided). Communication
from the Microprocessor via pins (31 SDA2 and 28 SCL2) to I502 pins (34 and 33) respectively.
I401 Audio Selector
The Audio Selector IC is responsible for selecting the input source for the Main Picture. Communication from
the Microprocessor via pins (31 SDA2 and 28 SCL2) to I401 pins (22 and 23) respectively.
I402 Video Selector
The Video Selector IC is responsible for selecting the input source for the Main Picture as well as the source for
the PinP or Sub picture. Communication from the Microprocessor via pins (31 SDA2 and 28 SCL2) to I402 pins
(45 and 46) respectively.
ON THE SUB DEFLECTION PWB:
IB01 Vertical Drive
This IC generates several Vertical signals used in the Deflection Circuit.
•
Vertical Drive
•
Vertical Parabolic
•
Vertical Sawtooth
The Microprocessor I004 also controls Vertical Size via I2C communication as well as Set Up where the Vertical
Drive signal is suppressed to defeat Vertical Deflection during Cut Off Adjustment. Communication from the
Microprocessor are routed from pins (30 SDA1 and 29 SCL1) to the connector PDS3 pins (3 and 4). Then to the
connector PPD1 pins (5 and 7) and then to IB01 pins (13 and 14) respectively.
Note:
Y Pr/Pb indicates any of the 18 ATSC formats.
Y Cr/Cb indicates 15.734KHz (NTSC or 480i)
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