TMDS361 datasheet(24/42 Pages) TI

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RSCL

RSDA

TSCL

TSDA

OVS

B0344-01

TSCL/TSDA

RSCL/RSDA

Vcc

0.5V

5V +

10%

Vcc/2

PLH

DDC I

2C Behavior

Master

Slave

DriverR

Driver T

Rdd

Rup

CABLE

SOURCE

slave

Tdd

Tup

medium

TMDS361

SLLS919 – DECEMBER 2008............................................................................................................................................................................................ www.ti.com

Figure 28. I2C Drivers in the TMDS361 (R Side Is the HDMI Source Side, T Side Is the HDMI Sink Side)

When the T side is pulled below 0.4 V by an external I2C driver, both drivers R and T are turned on. Driver R

pulls the R side to near 0 V, and driver T is on, but is overridden by the external I2C driver. If driver T is already

on, due to a low on the R side, driver R just turns on.

When the T side is released by the external I2C driver, driver T is still on, so the T side is only able to rise to the

VOL of driver T. Driver R turns off, because VOL is above its 0.4-V VIL threshold, releasing the R side. If no

external I2C driver is keeping the R side low, the R side rises, and driver T turns off once the R side rises above

1.5 V, see Figure 29.

Figure 29. Waveform of Driver T Turning Off

It is important that any external I2C driver on the T side is able to pull the bus below 0.4 V to achieve full

operation. If the T side cannot be pulled below 0.4 V, driver R may not recognize and transmit the low value to

the R side.

The typical application of the TMDS361 is as a 3×1 switch in a TV connecting up to three HDMI input sources to

an HDMI receiver. The I2C repeater is 5-V tolerant, and no additional circuitry is required to translate between

3.3-V and 5-V bus voltages. In the following example, the system master is running on an R-side I2C-bus while

the slave is connected to a T-side bus. Both buses run at 100 kHz, supporting standard-mode I2C operation.

Master devices can be placed on either bus.

Figure 30. Typical Application

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