STDVE003A datasheet(13/41 Pages) STMICROELECTRONICS

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STDVE003A

Functional description

13/41

3.2.1

SEL operating modes

The active source is selected by configuring source select inputs, S1, S2 and S3. The

selected TMDS inputs from each port are switched through a 3-to-1 multiplexer. The I2C

interface of the selected input port is linked to the I2C interface of the output port, and the

hot plug detector (HPD) of the selected input port is output to HPD_SINK. For the unused

ports, the I2C interfaces are isolated, and the HPD pins are kept low.

H: logic high; L: logic low; X: don't care; Z: high impedance

3.3

HPD pins

The input pin HPD_SINK is 5 V tolerant, allowing direct connection to 5 V signals. The

switch is able to pass both 0 V and 5 V signal levels. The HPD_SINK is an input pin while

the A_HPD, B_HPD and C_HPD are open-drain outputs.

3.4

DDC channels

The DDC channels are designed with a bidirectional NMOS gate, providing 5 V signal

tolerance. The 5 V tolerance allows direct connection to a standard I2C bus, thus eliminating

the need for a level shifter. There should be external pull-up resistors on either side of the

device on both the SCL and SDA lines.

Table 5.

SEL operating modes

Control pins

I/O selected

Hot-plug detect status

Y/Z

SCL_SINK

SDA_SINK

HPD1

HPD2

HPD3

A1/B1

SCL1

SDA1

HPD_SINK

A2/B2

SCL2

SDA2

LHPD_SINKL

A3/B3

SCL3

SDA3

HPD_SINK

LLL

None

(Z)

None (Z)

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