參數(shù)資料
型號(hào)： TMDS261BPAGR
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 22/49頁(yè)
文件大?。?/td> 11321K
代理商： TMDS261BPAGR
RSCL
RSDA
TSCL
TSDA
OVS
R
T
B0344-01
TSCL/TSDA
RSCL/RSDA
VCC
0.5V
5V ±10%
VCC/2
t
PLH
DDC I
2C Behavior
www.ti.com .......................................................................................................................................................................................... SLLS987 – SEPTEMBER 2009
Figure 40. I2C Drivers in the TMDS261B (R Side Is the HDMI Source Side, T Side Is the HDMI Sink Side)
When the T side is driven below 0.4 V by an external I2C driver, both drivers R and T are turned on. Driver R
drives 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 41.
Figure 41. Waveform of Driver T Turning Off
It is important that any external I2C driver on the T side is able to drive the bus below 0.4 V to achieve full
operation. If the T side cannot be driven below 0.4 V, driver R may not recognize and transmit the low value to
the R side.
The typical application of the TMDS261B is as a 2×1 switch in a TV, connecting up to two 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,
whereas 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.
Copyright 2009, Texas Instruments Incorporated
29
Product Folder Link(s) :TMDS261B
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