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参数资料
| 型号： | TMDS251PAGRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 多路复用及模拟开关 |
| 英文描述： | 3-CHANNEL, AUDIO/VIDEO SWITCH, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 11/28页 |
| 文件大小： | 751K |
| 代理商： | TMDS251PAGRG4 |
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SINK
HPD1
SDA1
SCL1
A21/B11
A22/B12
A23/B13
A24/B14
HPD2
SDA2
SCL2
A21/B21
A22/B22
A23/B23
A24/B24
EQ
S1
S2
HPD_SINK
SDA_SINK
SCL_SINK
Y1/Z1
Y2/Z2
Y3/Z3
Y4/Z4
VSadj
VDD
(5V)
VCC
(3.3V)
GND
E-EDID
HDMI RX
DDC_SDA
DDC_SCL
Y1/Z1
Y2/Z2
Y3/Z3
Y4/Z4
5V
47kW
mController
3.3V
4.7kW
CEC
4.02kW 10%
1kW
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
SOURCE 1
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
SOURCE 2
A DTV Supporting an Active CEC Link
Case 1 – AC Coupled Source (See Figure 19, Port 1)
Case 2 – DC Coupled Source (See Figure 19, Port 2)
Case 3 – External Logic Control for HPD (See Figure 19, Port 3)
SLLS852 – AUGUST 2007
Figure 18. Two-Port HDMI Enabled DTV with TMDS251 – CEC Commands Passing Through
In Figure 19, R, and S, the CEC PHY and CEC LOGIC functions are added. The DTV can initiate and/or react to
CEC signals from its remote control or other audio/video products on the same CEC bus. All sources must have
their own CEC physical address to support the full functionality of the CEC link.
A source reads its CEC physical address stored its E-EDID memory after receiving a logic-high from the HPD
feedback. When HPD is high, the sink-assigned CEC physical address should be maintained. Otherwise, when
HPD is low the source sets CEC physical address value to (F.F.F.F).
When the source TMDS lines are AC coupled or when the source cannot detect the TMDS termination provided
in the connected sink, the indication of the source selection can only come from the HPD signal. The TMDS251
HPD1 pin should be applied directly as the HPD signal back to the source.
When the source TMDS lines are DC coupled, there are two methods to inform the source that it is the active
source to the sink. One is checking the HPD signal from the sink, and the other is checking the termination
condition in the sink.
In a full CEC operation mode, the HPD signal is set high whether the port is selected or not. The source loads
and maintains the CEC physical address when HPD is high. As soon as HPD goes low, the source loses the
CEC physical address. To keep the CEC physical address to the source, the HPD signal is looping back from the
source provided 5-V signal through a 1-k
pull-up resistor in the sink. This method is acceptable in application
where the HDMI transmitter can detect the receiver termination by current sensing, and the receiver has
switchable termination on the TMDS inputs. The internal termination resistors are connected to the termination
voltage when the port is selected, or they are disconnected when the port is not selected. The TMDS251
features switchable termination on the TMDS inputs.
When the HDMI transmitter does not have the capability of detecting the receiver termination, using the HPD
signal as a reference for sensing port selections is the only possible method. External control logic for switching
the connections of the HPD signals between the HPD pins of the TMDS251 and the 5-V signal from the source
provides a good solution.
Copyright 2007, Texas Instruments Incorporated
19
Product Folder Link(s): TMDS251
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| TMDS261PAG | 功能描述:视频开关 IC 2 to 1 HDMI Switch RoHS:否 制造商:Texas Instruments 开关数量:4 开启电阻（最大值）:12 Ohms 传播延迟时间: 开启时间（最大值）: 关闭时间（最大值）: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WQFN-42 封装:Reel |
| TMDS261PAGR | 功能描述:视频开关 IC 2 to 1 HDMI Switch RoHS:否 制造商:Texas Instruments 开关数量:4 开启电阻（最大值）:12 Ohms 传播延迟时间: 开启时间（最大值）: 关闭时间（最大值）: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WQFN-42 封装:Reel |
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