November 1985 5
Philips Semiconductors Product specification
Switch for CTV receivers TDA8440
I2C BUS CONTROL
Detailed information on the I2C bus is available on request.
Table 2 TDA8440 I2C bus protocol.
OFF FUNCTION
With the OFF input all outputs can be switched off (mode high ohmic), depending on the value of D0.
STA A6A5A4A3A2A1A0R/W AC D7D6D5D4D3D2D1D0AC STO
STA = start condition
A6= 1 Fixed address bits
A5= 0 Fixed address bits
A4= 0 Fixed address bits
A3= 1 Fixed address bits
A2= sub-address bit, fixed via S2input
A1= sub-address bit, fixed via S1input
A0= sub-address bit, fixed via S0input
R/W = read/write bit (has to be 0, only write mode allowed)
AC = acknowledge bit (= 0) generated by the TDA8440
D7= 1 audio la is selected to audio output a
D7= 0 audio la is not selected
D6= 1 audio lla is selected to audio output a
D6= 0 audio lla is not selected
D5= 1 audio lb is selected to audio output b
D5= 0 audio lb output is not selected
D4= 1 audio llb is selected to audio output b
D4= 0 audio llb is not selected
D3= 1 video l is selected to video output
D3= 0 video l is not selected
D2= 1 video ll is selected to video output
D2= 0 video ll is not selected
D1= 1 video amplifier gain is times 2
D1= 0 video amplifier gain is times 1
D0= 1 OFF-input inactive
D0= 0 OFF-input active
STO = stop condition