STV6411A ST Microelectronics, STV6411A Datasheet - Page 19

• Manufacturer Part Number: STV6411A
• Description: AUDIO/VIDEO SWITCH MATRIX
• Manufacturer: ST Microelectronics

APPLICATION NOTE (continued)
2.c - Fast Blanking
Fast Blanking signal is used to make an equipment
consider its RGB inputs for full-screen display 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 equipment
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 V
This pin can be left open (not pulled down) if this
function is not used.
3 - I
3.a - Address
You can choose the address of the device by
N.B.: Do not forget your favourite ESD protections for I/O signals of plugs.
2
C Bus
CC12
).
setting the Pin ADD to ground or to V
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 device.
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.
Send a start condition, the address of the device
(+1) and then send one byte clock to read the
unique data register.
DD
STV6411A
. The former
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