STV6414A Datasheet, PDF (18/32 Pages) STMicroelectronics – Audio/video switch matrix

I²C bus selection
3
I²C bus selection
STV6414A
Data transfers follow the usual I²C format; that is, after the start condition (S), a 7-bit slave
address is sent, followed by an eight-bit data direction bit (W). An 8-bit sub-address is sent
to select a register, followed by an 8-bit data word to be included in the register. The IC’s I²C
bus decoder enables the automatic incrementation mode in write mode.
The circuit operates at clock frequencies of up to 400 kHz.
Table 14. String format
Write only mode (S = Start condition, P = Stop condition, A = Acknowledge)
S SLAVE ADDRESS 0 A SUB-ADDRESS
A DATA
A
P
Table 15. Read only mode
S
SLAVE ADDRESS
1 A DATA
A
P
Table 16. Slave address
Address
A6
A5
Value
1
0
A4
A3
A2
A1
A0
0
1
0
1
X
Table 17. Auto increment mode
S SLAVE ADDRESS 0 A SUB-ADDRESS A DATA0 A DATA1 A ....
Sub-Address
Sub-Address +1
DATAn A P
Sub-Address + N
3.1
I²C bus addresses
Write Address: 1001 0110 = 96(hex), Read Address: 1001 0111 = 97(hex)
Table 18. Input signal summary (write mode)
Reg add
(hex)
d7
Data
d6
d5
d4
d3
d2
d1
d0
Audio
00h
TV Stereo
Mono
TV 0/6 dB
TV Volume-62 dB to 0 dB - 2 dB steps
Soft
Volume
Mode
01h
VCR Stereo Not Used
Mono
(See Note)
VCR Audio
Switch Control
CINCH
Audio
Gain
TV/CINCH Audio Switch Control
Video
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