TDA8443A Philips Semiconductors, TDA8443A Datasheet - Page 5

• Manufacturer Part Number: TDA8443A
• Description: I2C-bus controlled YUV/RGB switch
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FUNCTIONAL DESCRIPTION
The circuit contains two sets of inputs (see Fig.1). Both
channels can receive RGB or YUV signals. Each set of
inputs has its own synchronization input, which internally
generates a pulse to clamp the inputs. The internal
clamping pulse can also be controlled by a signal (e.g. a
sandcastle pulse) applied to pin 24. The pulse will occur
during the time that the signal at pin 24 is between
5.5 and 6.5 V. If both a sync signal and a pin 24 signal are
used the signal should be applied to pin 24 via a 1 k
resistor.
RGB signals of Channel 2 can be matrixed to YUV signals.
The outputs can be set in a high impedance OFF state,
which allows the use of seven devices in parallel
(I
The circuit can be controlled by an I
microcontroller or directly by DC voltages. The fast
switching input can be operated via pin 16 of the
peritelevision connector.
1995 Mar 07
handbook, full pagewidth
2
C-bus mode).
I
See Table 1.
2
C-bus controlled YUV/RGB switch
STA
1
1
0
1
2
C-bus compatible
MA2 MA1 MA0
Fig.3 I
0
2
ACK
C-bus protocol.
5
D7
I
The protocol for the devices in I
in Fig.3.
Table 1 Protocol bit description
2
STA
MA2 to MA0
ACK
D7
D6
D5 to D3
D2
D1 and D0
STO
C-bus mode
D6
BIT
D5
D4
start condition
address selection bits; see Table 2
acknowledge bit
channel selection bit; see Table 3
matrix selection bit; see Table 3
gain control bits; see Table 4
fast switching priority bit; see Table 5
output state control bits; see Table 6
stop condition
D3
D2
D1
DESCRIPTION
D0
2
C-bus mode is shown
ACK STO
MSA003
Product specification
TDA8443A