參數(shù)資料
型號(hào)： TMDS461PZT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： PLASTIC, TQFP-100
文件頁(yè)數(shù)： 21/43頁(yè)
文件大?。?/td> 3111K
代理商： TMDS461PZT
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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