November 1985 5
Philips Semiconductors Product specification
Switch for CTV receivers TDA8440
I
2
C BUS CONTROL
Detailed information on the I
2
C bus is available on request.
Table 2 TDA8440 I
2
C bus protocol.
OFF FUNCTION
With the OFF input all outputs can be switched off (mode high ohmic), depending on the value of D
0
.
STA A
6
A
5
A
4
A
3
A
2
A
1
A
0
R/W AC D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
AC STO
STA = start condition
A
6
= 1 Fixed address bits
A
5
= 0 Fixed address bits
A
4
= 0 Fixed address bits
A
3
= 1 Fixed address bits
A
2
= sub-address bit, fixed via S
2
input
A
1
= sub-address bit, fixed via S
1
input
A
0
= sub-address bit, fixed via S
0
input
R/W = read/write bit (has to be 0, only write mode allowed)
AC = acknowledge bit (= 0) generated by the TDA8440
D
7
= 1 audio la is selected to audio output a
D
7
= 0 audio la is not selected
D
6
= 1 audio lla is selected to audio output a
D
6
= 0 audio lla is not selected
D
5
= 1 audio lb is selected to audio output b
D
5
= 0 audio lb output is not selected
D
4
= 1 audio llb is selected to audio output b
D
4
= 0 audio llb is not selected
D
3
= 1 video l is selected to video output
D
3
= 0 video l is not selected
D
2
= 1 video ll is selected to video output
D
2
= 0 video ll is not selected
D
1
= 1 video amplifier gain is times 2
D
1
= 0 video amplifier gain is times 1
D
0
= 1 OFF-input inactive
D
0
= 0 OFF-input active
STO = stop condition
