STV6411 查看數據表（PDF） - STMicroelectronics

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STV6411

AUDIO/VIDEO SWITCH MATRIX

STMicroelectronics 

STV6411A

APPLICATION NOTE (Cont’d)

2.c - Fast Blanking

Fast Blanking signal is used to make an equip-

ment consider its RGB inputs for full-screen dis-

play or fast insertion (OSD, etc.). The output of

such signal is exactly managed in the same way

as RGB (that is important for levels and delays).

The input is DC coupled (insert a few hundreds

ohms resistors for external input).

2.d - Slow Blanking

Slow Blanking signal is used to make an equip-

ment consider an external input (e.g. CVBS and

SOUND). The input/output of such signal is very

simple, DC coupled (insert a few hundreds ohms

resistors for external I/O). Notice that this function

is requesting a 12V power supply (on Pin VCC12).

This pin can be left open (not pulled down) if this

function is not used.

selects 94h and the latter selects 96h. These val-

ues correspond to the writeable (or control) regis-

ters. Change the lowest bits to `1' (that gives 95h

and 97h) to read the readable register of the de-

vice. One device will answer (acknowledge) to its

both addresses 94h and 95h or 96h and 97h.

3.b - Write Mode

This mode is used to control the device, to select

switches positions, gains, etc.

Send a start condition, the address of the device,

the address of the register (its number), and the

data to put in it. At this point you can send a stop or

send the data of the following registers (that is

what we call auto-increment).

3.c - Read Mode

This mode is used to read some data such as

slow-blanking input signals.

3 - I2C Bus

3.a - Address

Send a start condition, the address of the device

(+1) and then send one byte clock to read the

unique data register.

You can choose the address of the device by set-

ting the Pin ADD to ground or to VDD. The former

N.B.: Do not forget your favourite ESD protections for I/O signals of plugs.

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