General description

STV6415A

4/15

Figure 2.

STV6415A block diagram

The main function of the STV6415A is to switch eight video input sources on the six outputs.

Each output can be switched to only one of the inputs, whereas any single input may be

connected to several outputs. The lowest level of each signal is aligned on each input

(bottom of sync pulse for CVBS or Black Level for RGB signals).

The nominal gain between any input and output is 6.5 dB. For Chroma signals, the

Each input can be used as a normal input or as a Chroma input (with external resistor

bridge). All the switching possibilities are changed through the I²C bus.

Driving a 75

Ω load requires an external transistor.

The switch configuration is defined by words of 16 bits: the I²C address (8 bits) then one

output configuration (8 bits). Therefore, six separated words of 16 bits are necessary to

determine the starting configuration at power-on (power supply: 0 to 10 V).

A new configuration needs only the words (16 bits) of the changed output channels.

20

11

10

8

6

5

3

1

18

17

16

15

14

13

12

Ground

Output Output Output Output Output Output

Input

Input

Input

Input

Input

Input

Input

Input

Bus Decoder

27

4

9

19

Data

Prog

Clock

VCC

Ground