5002C-CGT Datasheet, PDF (3/23 Pages) List of Unclassifed Manufacturers – Dual SCART A/V Switch

AVPro^® 5002C
Dual SCART A/V Switch
TV RGB OUTPUTS
The device accepts RGB video signals from two
sources. The Aux_R, Aux_G, Aux_B input pins are
typically connected to the auxiliary SCART
connector. The Enc_R, Enc_G, Enc_B input pins are
connected to the RGB outputs of an external video
encoder device. These outputs are used as a video
source for the TV SCART pins TV_R, TV_G, and
TV_B. The RGB video source is selected by setting
the lower three (3) bits of serial port Register 1.
When these bits are set to xxxxxx00, the RGB
source will be the encoder. When these bits are set
to xxxxxx01, the source will be the auxiliary port. The
TV RGB outputs can be muted independently from
the TV composite outputs. Setting Bit 6 of Register 1
low (0) will allow normal operation. Setting Bit 6 high
(1) will set the TV RGB outputs to the blank level.
RGB Gain: The gain of the RGB outputs can be
adjusted to one of four different levels. Bits 4 and 5
in Register 2 set the gain of the RGB output
amplifiers according to the following table:
Bit 5
0
0
1
1
Bit 4
0
1
0
1
RGB Amplifier Gain
Gain = 2.0 V/V = A0
Gain = A0 - 10%
Gain = A0 - 20%
Gain = A0 - 30%
DC Restore: The device will generate a DC restore
level on each video output based on timing
referenced to a horizontal sync pulse. When the
sync pulse is detected, the DC restore circuit will act
to position the blank level to 0.6 V at the respective
video output load. The device can be programmed
to look for the horizontal sync pulse on all of the
RGB input pins or on the associated composite
video input pin (Aux_YC for the auxiliary port or
Enc_YC for the external encoder). Bit 7 of Register 1
determines the horizontal sync source. At power-up,
this bit defaults to a low (0) state which programs the
device to look for a sync detect on the RGB input
signals. In this mode, the device can detect a
horizontal sync on any of the three RGB input
signals. When Bit 7 is set to a high (1) state, the
device will look for a sync detect from the signal on
either the Aux_YC or Enc_YC pin depending on
which source is selected.
Blanking: The signal on the Blank output pin is
determined by the state of two MSBs in Register 2
according to the following table:
Bit 7
Bit 6
Blank source
0
0
BLANK = ABLANK
0
1
BLANK = EBLANK
1
0
BLANK = 0V
1
1
BLANK = 4V @ IC output pin
The user must insure that the source of the Blank
output is the same as the source for the RGB
outputs, i.e.ABLANK is selected when the auxiliary
RGB is active and EBLANK is selected when the
encoder RGB is active.
TV COMPOSITE OUTPUT
The device provides inputs for two composite video
sources that can be switched to the TV SCART
composite video pin, TV_YCout. The AUX_YC input
pin is typically connected to the “Video In” pin on the
auxiliary SCART connector. The Enc_YC input pin is
typically connected to the “YC” or “CVBS” output
from the external video encoder device. Selection of
the video source for the TV composite output is
accomplished when the RGB video source is
selected (see the register tables).
TV SVHS OUTPUT MODE
The device supports SVHS video format. The SVHS
mode is selected for the TV SCART using the lower
three (3) bits of Register 1. When the SVHS mode is
selected, the TV_YCout pin will provide the luminance
signal output from the selected source. The chroma
output will be provided on the TV_R pin. The video
source for SVHS mode can be either the auxiliary port
or the encoder port. When the auxiliary port is
selected as the video source, the video on Aux_R will
be provided at the TV_R output pin and the Aux_YC
video will be provided at the TV_YCout pin.
The device will support SVHS mode for three
encoder interface formats. The first encoder
interface format accepts chroma signals on the
Enc_C pin and luma signals on the Enc_Y pin. This
is designated "SVHS, Enc 1" mode. The second
format will receive chroma information on the Enc_B
pin and luma information on Enc_G. This format is
designated "SVHS, Enc 2". The third format will
receive chroma information from the Enc_R pin and
luma information from the Enc_G pin. This mode is
designated “SVHS, Enc 3”.
When the SVHS mode is selected, the DC restore
on the TV_R pin will average to approximately 1.8
VDC at the output pin. The DC restore circuit will act
to position the blank level to 0.6 V at the TV_YCout
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