STV6412A データシートの表示（PDF） - STMicroelectronics

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STV6412A

Audio/video switch matrix

STMicroelectronics 

I2C bus selection

3

I2C bus selection

STV6412A

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.

String format

Write only mode (S = Start condition, P = Stop condition, A = Acknowledge)

S

Slave address

Read only mode

0A

Sub-address

A Data A P

S

Slave address

1 A Data A P

Slave address

t(s) Address

A6

A5

A4

A3

A2

A1

A0

uc Value

1

0

0

1

0

1

X

rod Auto increment mode

lete P S Slave address 0 A

Sub-address

A Data0 A Data1 A .... Datan A P

Sub-address

Sub-address +1 Sub-address + N

Obso 3.1

I2C bus addresses

) - Write address: 1001 01X0, read address: 1001 01X1

t(s Selection pin grounded address: X = 0, write address = 94(hex), read address = 95(hex)

uc Selection pin to supply address: X = 1, write address = 96(hex), read address = 97(hex)

rod Table 13. Input signal summary (write mode)

P Reg

Data

te addr

(hex)

d7

d6

d5

d4

d3

d2

ole Audio

bs00 TV stereo TV 0/6 dB

O mono

TV volume-62 dB to 0 dB - 2 dB steps

d1

d0

Soft volume

mode

01

VCR stereo

Mono

Not used

(see

Note 1)

VCR audio

switch control

CINCH

audio gain

TV/CINCH audio switch control

16/31

Doc ID 9754 Rev 2

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