AVPro® 5002R
Dual SCART A/V Switch
DATA SHEET
The RGB mode of operation requires special
consideration. The output driver on the Aux_Cout pin
acts as part of the load for the RED signal on pin 15 of
the SCART connector. Register 1 must be set to
x0011001 to select the auxiliary SCART as the RGB
source for the TV outputs and selects the external
video encoder as the source for the Auxiliary SCART
connector. This provides an output impedance of
about 0Ω on the Aux_Cout pin. This setting also allows
the Enc_C pin to pass through the Aux_Cout pin.
Due
to this, the outputs of the external video encoder
must be disabled to prevent corruption of the
incoming RED video signal.
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
xxxx00xx
xxxx01xx
xxxx10xx
xxxx11xx
Aux_Fnc
output
output
input
Passthru I/O
TV_Fnc
output
input
output
Passthru O/I
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 comparator. The comparator senses
the voltage on the input pin and sets the two (2) LSBs in the
read register according to the following table:
Input voltage
< 2.0 V
4.5 to 7.0V
>9.5 V
Bits
xxxxxx00
xxxxxx01
xxxxxx10
Function
Normal TV
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 in
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 10kΩ or higher.
For the case where Register 2 is set to xxxx11xx, the input
signal on the
Aux_Fnc
pin is passed directly through to the
Figure 2: 5002R Audio Switching Block Diagram
TV_Lin
Mux
Mux
Aux_Lout
Aux_Mono
TV_Rin
Mux
Mux
Aux_Rout
Mux
A
Lin
Aux_Lin
A
Rin
Aux_Rin
Mux
Mux
Mux
B
C
Mux
B
C
Mux
Lout
Mux
TV_Lout
Mod_Mono
TV_Rout
Mux
Rout
A: DAC Input Gain (0, 6, 9, or 11.5dB)
B: Volume Control Gain (0 or 6dB)
C: Volume Control Attenuation (0 to –63 dB in –1dB steps)
Page: 5 of 30
©
2008 TERIDIAN Semiconductor Corporation
Rev 2.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
