5002C-CGT Datasheet, PDF (5/23 Pages) List of Unclassifed Manufacturers – Dual SCART A/V Switch

AVPro^® 5002C
Dual SCART A/V Switch
AUXILIARY VIDEO MUTE
All auxiliary video outputs can be simultaneously
disabled by programming Bits 3-5 in Register 1. The
power-up default condition is xx111xxx, which sets all
auxiliary video outputs to 0 VDC and switches the
auxiliary audio outputs to Lin/Rin.
FUNCTION SWITCHING
The device provides functions switching pins for both the
Auxiliary (Aux_Fnc ) and TV (TV_Fnc ) SCART ports.
Both of these pins are bi-directional. The direction of the
pins is determined by setting bits in Register 2 according
to the following table:
Bits
Aux_Fnc
TV_Fnc
xxxx00xx
output
output
xxxx01xx
output
input
xxxx10xx
input
output
xxxx11xx
Passthru I/O
Passthru O/I
For the case where Register 2 is set to xxxx11xx, the
input signal on the Aux_Fnc pin is passed directly
through to the TV_Fnc pin as an output, or vice versa.
This mode is useful when the rest of the system powers
down and all signals from the auxiliary port are passed
directly through to the TV port, or vice versa.
When a function pin is set as an input, the voltage on that
pin is applied to an internal comparitor. The comparitor
senses the voltage on the input pin and sets the two (2)
LSBs in the read register according to the following table:
Input voltage
< 4.0 V
Bits
xxxxxx00
Function
Normal TV
4.0 to 8.0V
>8.0 V
xxxxxx01
xxxxxx10
16:9 aspect
Peritelevision
When a function pin is set as an output, the output level
for the pin is determined by the state of the two LSBs
Register 2, according to the following table:
Bits
xxxxxx00
xxxxxx01
xxxxxx10
xxxxxx11
Output voltage
~0 V
~6 V
~ 11 V
~ 11 V
Function
Normal TV
16:9 aspect
Peritelevision
Peritelevision
Note that both the Aux_Fnc pin and the TV_Fnc pin
can be set as outputs simultaneously, however they will
have the same output voltage.
The function output circuit includes short circuit
protection. When a function pin is in the 6V or 11V
output mode, if the SCART connection is shorted to
ground, then the output is disabled. Likewise, when a
function pin is in the 0V output mode, if the SCART
connection is connected to a voltage source, then the
output is disabled. The load for the function outputs is
designed to be 10k or higher.
TV_Lin
Mux
Mux
TV_Rin
Mux
Mux
A
BC
Mux
Lin
Mux
Aux_Lin
A
BC
Rin
Mux
Aux_Rin
Mux
Aux_Lout
Aux_Mono
Aux_Rout
Mux
Lout
Mux
TV_Lout
Mod_mono
Mux
TV_Rout
Mux
Rout
A: DAC Input Gain (0, 6, 9 or 11.6 dB)
B: Volume Control Gain (0 or 6 dB)
C: Volume Control Attentuation (0 to -31 dB in -1 dB steps)
Figure 2: 5002C Audio Switching Block Diagram
5