參數(shù)資料
型號(hào)： TMDS351PAGR
廠商： TEXAS INSTRUMENTS INC
元件分類： 多路復(fù)用及模擬開關(guān)
英文描述： 3-CHANNEL, AUDIO/VIDEO SWITCH, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 549K
代理商： TMDS351PAGR
Layout Considerations
Using the TMDS351 in Systems with Different CEC Link Requirements
A DTV Supporting a Passive CEC Link
E-EDID Reading Configurations in Standby Mode
SLLS840A – MAY 2007 – REVISED AUGUST 2007 .......................................................................................................................................................... www.ti.com
The high-speed differential TMDS inputs are the most critical paths for the TMDS351. There are several
considerations to minimize discontinuities on these transmission lines between the connectors and the device:
Maintain 100- differential transmission line impedance into and out of the TMDS351
Keep an uninterrupted ground plane beneath the high-speed I/Os
Keep the ground-path vias to the device as close as possible to allow the shortest return current path
Keep the trace lengths of the TMDS signals between connector and device as short as possible
The TMDS351 supports a DTV with up to three HDMI inputs when used in conjunction with a signal-port HDMI
receiver or four HDMI inputs when used in conjunction with a dual-port HDMI receiver. Figure 18 and Figure 19
show simplified application block diagrams for the TMDS351 in different DTVs with different consumer electronic
control (CEC) requirements. The CEC is an optional feature of the HDMI interface for centralizing and simplifying
user control instructions from multiple audio/video products in an inter-connected system, even when all the
audio/video products are from different manufacturers. This feature minimizes the number of remote controls in a
system, as well as reducing the number of times buttons need to be pressed.
In Figure 18, the DTV does not have the capability of handling CEC signals, but allows CEC signals to pass over
the CEC bus. The source selection is done by the control command of the DTV. The user cannot force the
command from any audio/video product on the CEC bus. The selected source reads the E-EDID data after
receiving an asserted HPD signal. The micro-controller loads different CEC physical addresses while changing
the source by means of the S1 and S2 pins.
When the DTV system is in standby mode, the sources will not read the E-EDID memory because the 1-k
pull-down resistor keeping the HPD_SINK input at logic low forces all HPD pins to output logic low to all sources.
The source will not read the E-EDID data with a low on HPD signal. However, if reading the E-EDID data in the
system standby mode is preferred, then TMDS351 can still support this need.
The recommended configuration sequences are:
1. Apply the same 3.3-V power to the VCC of TMDS351 and the TMDS line termination at the HDMI receiver
2. Turn off VCC, and keep VDD on. The TMDS circuit is off, but the HPD, the DDC and the source selection
circuits are active.
3. Set S1 and S2 to select the source port which is allowed to read the E-EDID memory.
Please note if the source has a time-out limitation between the 5 V and the HPD signals, the above configuration
is not applicable. Uses individual EEPROMs assigned for each input port, see Figure 19. The solution uses
E-EDID data to be readable during system power off or standby mode operations.
18
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TMDS351
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