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參數資料
| 型號： | TMDS461PZTR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | PLASTIC, TQFP-100 |
| 文件頁數： | 21/43頁 |
| 文件大小： | 3111K |
| 代理商： | TMDS461PZTR |
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TSCL/TSDA
RSCL/RSDA
Vcc
0.5V
5V +
10%
Vcc/2
t
PLH
DDC I
2C Behavior
Master
Slave
DriverR
Driver T
V
Rdd
R
Rup
C
CABLE
C
SOURCE
C
I
C
O
C
slave
V
Tdd
R
Tup
C
medium
RSCL
RSDA
9thClockPulse- AcknowledgeFromSlave
SLLS915 – JANUARY 2009 ............................................................................................................................................................................................... www.ti.com
Figure 33. 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 TMDS461 is as a 4:1 switch in a TV connecting up to four 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 34. Typical Application
Figure 35 illustrates the waveforms seen on the R-side I2C-bus when the master writes to the slave through the
I2C repeater circuit of the TMDS461. This looks like a normal I2C transmission, and the turnon and turnoff of the
acknowledge signals are slightly delayed.
Figure 35. Bus-R Waveform
28
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TMDS461
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